Arjo Dedessa Hydropower & Irrigation Project Summary

ACC -I??
FEDERAL DEMOCRATIC REPUOUC OF ETHIOPIA
MINISTRY OF WATER RESOURCES
ARJO DEDESSA HYDRO POWER AND IRRIGATION PROJECT
1^'hydro
AL FEASIBILITY REPORT
VOLUME-IV
AL AND METEOROLOGICAL STUDIES
<
Ilie. 2999
Addis Afeali
-r. WllER WORKS DESIGN & SUPERVISION ENTERPRISE
IN ASSOCIATION WITH
INTERCONTINENTAL CONSULTANTS AND TECHNOCRATS INDIA PVT
P O Box 2%I Addis Ababa Ethiopia Td (251)1 614501/631890 Fax (1251)1 61537 IF mail uHYDROPOWER FEASIBILITY REPORT
ARJO-DEDESSA HYDROPOWER & IRRIGATION PROJECT
LIST OF VOLUMES SUBMITTED
VOLUME I VOLUME I. VOLUME HI
VOLUME IV
VOLUME V
VOLUME VI
VOLUME VII
EXECUTIVE SUMMARY
MAIN FEASIBILITY REPORT
GEOLOGICAL & GEOTECHNICAL STUDIES HYDROLOGICAL 4 METEOROLOGICAL STUDIES
DAM & APPURTENANT WORKS HYDROPOWER STUDIES FEASIBILITY STAGE DRAWINGSArja Uedem. Hydropower & Irnfiidon Project Meteon&loglcaj t Hydrological Feasibility Studies
June 2009
TABLE OF CONTENTS
EXECUTIVE SUM.MART.
i._i-ii.ii.si-ibiidi-ii ■■■■■■■:>■ j.Lim ■■■■■ ■■■■ ■■■■■■■.■■Jiai-ibiLJiaibiiBi-i. ■■ ■■■■■■■■ ■ ■■■■ ■ ■ ■■■ ■■ ■ ■ ■■ I
— H   ' M T .R S'DlJ C Tl raiBimaii ■ ■■■riinr.' ■■ ■■■■—inr«!-iH!!-
3
Eu'OLUllOh OF THE CONCEPT FGH POWE* C5ENE F-ATlOM
2 THE m F£Ail8?LiTT$TU&* FOR IRRIGATION CUM HYDROPOWER PROJECT
1 3      PRE SENT FEAiQlLlTY STUDY . .
2.0    THE RFVER &A$IN AND SUB BASIN..........
2 3     THE NILE BASIN
2 4     The DE&E 554 CATCHMENT
3.0    DATA IASE ..lu ■■.■ijuiiii ■■ JiEimrii ii ini«
.•«**4»at>aaaabafe8i
!■■■• itirti’i 6
3 1 CLIMATOLOGILAL DATA
rainfall .
3.3       river discharge
SEDIMENT DATA
3
2
2
4
4
6
£
All II I I I I II ft -•»           »*• •••-«
>a .• ionuiMiiiifVit*i
4
ESTIVATION Of CMP REFEBENf( E^ATElTflANSPIPATlQH
i.a—i ki i m i i—!. 6
B
imtaiMmilHmi 7
43
Ji J
*3 3
Causative Cumate ....
METEOROLOGICAL DATA
WHfflraiopidT.’ CMHmWWI SWWflJ Air FfmpfY-g-.Ujrr1
4MIUIMIi> lllli II- -
7
............................. ’ .»».» ■ •«• •••■
42 J
4 J 4
*25            Sfliflf NMtaTtfin
4 3       PENMAN MONTEITH EQUATION
5 9 RAINFALl AHAL^IJ ....................... .
S i       the analysis
S 2      RAiNFA., INTfRNA. ANt-ETERNAL CONSISTENCY
JIMlilirtt-tt’Hi air*t*ai
3
3
3
8
-2
S3
ESTIMATION GF FAINFA4L R El. ABU TV lEVEL
$4       ESTiMATlOh OF MAXIMUM RASNFALL FREQUENCIES
6.0
MONTHLY $TBE AM FLOW AhAilfSlS ...
i.iUi.i.uibiwmu..i&i>i.iai.iiJUMUiiaiaiiiiiiiiiiiiiiiiirii n in u nan n si i^irn
HYDR DLCGiCAL OB SEHV ATlON STATiQ+J >
!_■■ I
62        extension of records
6 3       synthetic flows
J.o ESTIMATION Of FLOODS fOR JlNGAuGEO CATCriMI NTS
HiaaMlBIlMllii lllli III at *11 a
7 1     rational method
7.2       5C5 ME’HOD
7 3 TRANSFERRING GAUGED DATA
11 inanaiiai ma■ ■ i uh iibii
i iirimi in ii man
7d
ESTIMATION OF WEIGHTED Au’ERAqE
7 5      SVHDE R ME THDD O< CCW5TH JCTING 5 YNTh E t if h ■ DftO&H APH
a.d   FLOOD FREQUENCY AhALV$I$
...........
3
16
Lc-
16
Lb
23
2;
. 22
2S
23
-3
24
81
INTRODUCTION
■j
*D
8         CHOICE CFDfSTfl-BUTlGN
design ■; "joos ano flood pouting y  L SPki iVAY DESIGN Fl DOC'
?2 2
iHlIBIM "ILI. IIF1L1I
92 3
ffJi/rirap 0/ Me PMF HnJrppw*
r.hc flrSr-VDK
32
J3
COFFERDAM DfSi-GN FLOOD
THE CR01S DRAINAGE rtDR*.5 DESIGN FLOOD
I?
b. ■
27
JR
28
28
It
Water Works Design & Supervision Enterprise In Assucutifni with Inter concn tn ml ConsuLtan ts and TecbnocraU FVL LtdArjd tbedrssi Hydropower i ImgAtltm Prsj&a Meteorological & Hydrological Feasibility Studies
June 2009
100
im. ■
■■■.■
W>
10
10
11-0
no
I
E C I Fv^ I N T A Ti CJN AN ["! lAf ATE R (J A L ITT
&T1MAT1OU 0^ SEOi M-E NT rITlD
OiSTRiB-LfllC hi. OF SEDlMf NT sN THE RESERVOIR
•A ate ft quality
...... Jl
31
31
32
r ejervoia simulation caar r d out f0a ia rigation feasibility..-.....uu.um............ ..... . . 3?
MODE LING FOR IRRIGATION CU M MV DROPOWEB G EM RATION ............................ ............ ........................... ........ .............. . 3B
12  3
EVOLUTION
32 J
SIMULA HONS #W OS’ Ti MAI PO WE ft GENE* ATON
13 J
PQWj R f KPIOR* TIOnS AT HI MR L EVf L5
JH
38
33
12*
ilO
INFERENCES.
au
fl E DUCTION OF FLOWS IN DE DE 5 SA SUB
0AJJN
....
14 0
MANDATORY DOWNSTREAM RELEASES .........
...................
ISO
REXQJM MENTATION 5
iririranr-Tf r-•
REFERENCED
III
Water Works Design ft Supervision Enterprise In As&flciAtlPn *1tfi Iniertontioent&l Cansultaad AodTscbnwrjits PW lidArjo Dedes $a Hydropower & Irrigation Project
Me i eorolo^tal & fl ydrviogical FeaslUlUfy Stu flies
-------- ------ ——
Ltaf i J J ahlrx
Iibk -i Fable DciajJi di Meir -r i -^ Lil i)bwh anm Slaiwfu k^afled m and around me pr -hm i'cj H Table a 2 Fipe^ ii| Chmaik Diij J * jitahie .ii rhe ju-idi:- Mettoral^KaJ Observation Siiiuii^
June zoos
-
Table a 1     Suaimrie> af Mercornlefik.il L Aaractertdies at RrnjecE Aiea
I able j 4 Suncmaj) of Esnmale.E Mean E To ol ^rtn DwdcttJ PrajtLi Area
Tabic 5 I klean MontiNy Itiinfid)
.. ■            ■
rabSf J.J      MonHih ftaanfalls-Cwrespnndinf io DifTtrent Rcliabilit) I e*eb ;it Pi-'iecc Ar-c-i
Tilde * I        Matimum Annual M-hf Ram fall Jabir 5 4 Maufflurn Rainfall
.................. ...
■*
I*1
14
M
3rid FrequefKbn
J able 6 I      A*>utabilih 4 klrrzm |1o^ Data in the Return
I able n 2     M^in ASurirb i *« I Io ia i in A1?ri ■»c?l i
Table b 3     < icffiiieni n! VartaLitWi of Miinllih ITrUi-iTgci. .-- ■ Table 6.a     Sumnurv of RcgMNul moiilM) naw khancteristlCJi fable h 4         SlJhKlii-^ i>F month k Ilo^l al AlJP [JcdE i^i Jaril Silt Talflt frh       RdubiliU I r^cl V? M<wiihl> Sweani flom al Him Sue . I jbfc r+* Mnnihh i ji [Jam Siic 511 ftefw arc in Million Cubic Meter?
Table H i      I Mimaled I food QuaiMitei &aied on Gi A' liiiJribuiicin fable JI 2     LsiuiiJicJ I lend Quanldc'1’ H-t td oft LLtn Jlntribol-on Table fl I      Sfnllwa.ii k-juLin^ fe*tuh% i ImjgdlHiii I cnihhrs Pfusep Table ^2      I‘A I F I k Jrngfapb tStdsruiECi
Fable fl J     t uinulariLc't-'iLrtne ■id Pt^bjfrk” MjxiinufTi 1 iiHJd
rjrfrlE Ip. I        ifeelallMjeuhipi btr^CCrt wartf
and scdjmdhE load
fable |fl 2         Monlhh Total *iedimcnE il.nad aE ibe ReMtn^OIJr She
Tabs? Ill ’     Ucwulited Total Sediment Load .Li Hit Rcrtrwur Site
Tabk in J LKt^.iLii^-Ar^j *. j^a.ih ReLV'T .li p j! An-^Drde -J Em^lim cwn F'n^cr RrMsrt >>ir i ,ihk- I it 5 IjfiiiihunoH ^11 ked*menl >n ihe Acp i Ttede -j Ktwn mr 1 Area Incrcmenl Meffovilj Talite 10 h 5k aid quaiiK jcm-uJes for utes *n itic t*cjfm ™ er
Table I i I IrngaiNNl w aic? Rcquinrmcfli* i<tf 5 ari-nr. s<enarRL
Table 12 I Firm Po^er .li Various BRI. LLinJiiJun 11 ? >u rn am I Minimum 1 able 12 - FRI at I T’h m anui Firm PWefGcwraflioU
IH IS IS
I*
■ -&
28
2d
33
U
■1
-T2
Waterworks Design & Supervision Enterprise In Association wnb taumutiiialil rsnsultanis ind Technocrats Pu LtdArje Dedma Hydrapottr r & Imgictoo Project Mecforolafftcal t Hydrologtcal Fe*<i bility Studies
EXECUTIVE SUMMARY
June 3OC9
The Dedessa sub Iron is  very  important one hydrological^ far the Aboay  River c#Jhg maja- Naw contributing sub basm Nearly  25 to 26% of the Ap-baP Nows  a: the border i$ due to Deoessa sue basic  Draining an area of neanr 34 000*m‘ it encompasses  -rs  mburaries  'ike Warne Dabana ano Angar aiii of which have been mwesipgatea for ambitious  rngafion ano Powe' peoftets  by  vanou® Study  groups  in the pasl Thu S Because of the hydrologies  virtues assooated with this sub oasm
The Rainfall Wrfh a variability of rainfall from 2013 mm in Demb. stat'On to 141" mm at Agaco stations  me rainfall results  in 1453 mm over the proposed Arjo dam and its  caichmenl These ra-nJaii «iim>Tes  in the MuOy have Deen made by  regionalization Followeo by  riggraurt slat-shcal analy&ts  tne dala of lhe statons  at Jirnma Oeoessa Bedelte Dtmbi and Agarp
*c e
r
included  appropriately  ana  after  consistency  Checks  and  such  checks  on  the  adequacy  in
quality  ano length The above mean annua- rainfall m the context pt ceria1 n sahent eiceedance probably  level years  like 7S -- 00% ano 90% are respectively  1 MBmm iQ9Dmtv ang 951mm Being un.moaa1 type of Temporal distribution bulk of me cam tai i63% i occu>$ in the Woe* ef 5 months May Ic September i ana as such me proposed a am 15 to have season- fO-MMftfl carry over
The Agro climatic sUuation The parameters  like monthly  mean temperature relative humid-ty  wind speed amj tunshme hours  f^rm the relevant inputs  m the esrmation of crop waler requirement of irrigation deve^pmer"
The data of me stations Geoeii*- Dedessa and Jsrrma were found to oe dooropriat? in representation and m qua*ty For analysis by stutrstica* techniques ano hyd^oiog-ca- methons On ascertaining these pa amete s they were used in tne estimation af the major input For crop
r
r
waler esr?mabi>r name^ Reference Ewapotranspiratron - ETa The eitirnaies of inese pa’a^wers s anr* al the figures shown be ow at annual mean level
r
-  Mean Temperature
=
22 5i c
e
-  Relative Humvdtty 
=
75 51%
-  Wma Speed
■
0 Tlmfwc
-  Suns nine Hours
*
6 89hn/day
-  Reference Ewaposranspiration ETo = l39?mm.'year
The Water Resources These couiei ce estaoi shed as a montniy Time series of 45 years from i960 to 2005 because of gooo data case avii^aDNity rn Dedessa and the- ne«g ■Dorr>j-'r >ub cas ns Th* data of :ne stations i«ke Decessa al Arjo upper Deaessa a? Demc-i Dacana near Abasma G'^gei Grube nea* Ascendaoc- and Gojeb near Sheoe ah formed a good data tas- '
s’at st-ca
( r eStirra’i-ng i*«- above i m* te^ies of 1 nw? at m-o rr ->r
.^r - -i ,
u e Ouiaiiad- mqrdniy u c serse^
me annual Row estimates a^e given Delow
da a aEj-e in if e sectu-ripi Einp^i t. 1-j forebay dtuprec n'v,.
Mwiyeat
75% Enteedance DfasaDtlCy year
=
=
2477 Mm
1'SOMnr
-     30% erceeaanceoroca&iii^ year
=
i635Mm
TO% ®J!C»edaiKe prOMDiIrly year
=
l39QMm3
Water Works Design &. Supervision Enterprise
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June 2009
r
cuscchjragmg scenario The power generation could reach only up ig 3MW ai 97% exceedance level This stood at 5MW and 7 tt/V m 65% ana 50' exceeding* K?ve
The exploratory  iim-jilt-ons  were to ce earned Out tudher w th different FRls MDDLS ano partem of releases  with mean Ta V^atfrr le-vei al ’322 mamsi The mode Ariosim was  sligmty recodeo for the fuflne' runs  Three demons  were sei for These Simulation^ and a number oi exploratory  power generation runs  were car tied ou^ The summary  cf me sahent ano optimal results of the domains aiong wrm me nomenclature ct mese domams is as beiow
Trie historic^ feme senes since may not form a spectrum of hydrological inputs lor the
simulation stjdj as recognized by trie h>drorpg«ca literature a synthetic senes oi length of
1000 years was generated by me robust ard time tested single sde multi season ARi type
Thomas-Fternng mode-
The Simulations These were earned out al a fferent assumptions and wtln Different options
-  During  me  irrigation  Feasibility  Study  simulations  were  earned  out  Foj-  four  different imgabon development scenarios lor about 14 OOQha The simulation mooei was a ia« u- made  type  developed  in  MS  Excel  The  MD-DL  was  kepi  ai  two  different  levels  luce l346  and  1350  mamn  as  dbetated  oy  legation  requirements  The  FRi  was  varied  irpm 1350fl9m  to  i35tH7m  The  synthelrcaky  generated  flow  time  series  of  1UOD  years formed  tr*e  hydrological  inputs  to  the  Simulation  runs  m  all  the  runs  me  irrigation  was successful  at  me  appropriate  norm  vu  80%  exceedance  probability  level  not  only  sc me  irrigation  is  successful  e^en  in  stringent  years  of  90%  ano  95%  exceedance prc.bapdrty    revels    Hence    no    ambiguity    arises    about    the    definite    success    of concenp-ated irnga’ion development
The dam though was  ptanned ro oe ntgn and to possess  good water resources  was constia-neo to nave a small 'ive storage to cater to tne need of rogation -mposed 5 fl udl Onucon^ramts
Though not n I he purview of the TOR of me ixngalion Feasibility Study the Consonants earned
□□t further simyiahons for exploring poss«&ie power generation over and aoove the irngatwn For ln>s the Cc-nsu^anrs developed another tailor maoe mooe. Fortran source coded teamen
A/pOSim initially a couple of irimuiMidft runs were carnea out with MDOt at 1345 and subsequently al iJSOm and FRl at 1953m and al i956m At MDOL two separate outlets were contemplated one for irrigation anti another for power
Tne average Tail water level was kept at ’322 mimsi
A sei of S simulal -on uns wftW £ d ffereni pa Hern of monthly releases indicaleo a sq to say 
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uArjo Dedessa Hydropower & Irdgstien Project Mt twological & Hydrologicaj Feasibility Studies
Jutie2W9
n-------------------------------------------------------------- r
Oomain
No
Power t 97*>.
a
Domain Nomenclature
FRL
excoeefante level
(Firm Power!
1           MDDL al a tower level ai 1346m and
11 22 MW
assumed pattern of monthly releases
1372m
1J?4m
13 3QMW
13 62MW
2
WOOL at tower level of i3*6m but
1372m
16 49MW
releases based on decision support
1374m
17 20MW
1376m
17 90MW
137flm
19 50MW
3
MDDil lor power al time lever ai
1370m
17 OOMW
1350m as imgaiicr outlet i with
1372m
16 10MW
wpirere oulietsj Deqs.on support
1374m
16 95MW
based releases
1376m
20 MW.1
A1 Ch-e end Of the irrigation FeiuMrty rt w*S concluaetl inert optimal Firm Hydropowtf general'on could te with FRL at 1376 rr am$J  a rd Hydrology  was  not a constraint However 1he constraints  oue to geoiog, geote-cfin-ca* aspects  environmental and social aspects  wete requires  lo oe examined In thai cotimai scenano it was  fauna that from simulations  the opt-ma. power woLrtd be 20MVJ m the domain 3 case with MDDL al 1350 ano FRl. at 13"6 which with a plant factor of 0 5 will lead to an rnstalM capacity of 33 3 MV;
Tne Tan Ware? Mean level m all the above cases was 1322 m amsi
-  r*ext  During  me  P*e-Feasibilily  Study  far  me  comomed  irrigation  cum  Mydropower   Dam the  simulations  were  up  dated  with  Mt  Ei«i  Simulation  Modeling  with  The  45  rears monthly  time  senes  o-   inflows  For  this  the  decision  support  recasts  were  sei  jp  for eacn  monrh  for  Hydropower  generalMjn  a*ter  satisfying  the  irrigation  needs  on  priority The  Minimum  ppentbng  pool  for  Hydropower  was  hepl  at  050  m  amsf  The  lrr«ga%on out let was also kept at that lewei The laii water mean ieve» was nowever  brought sown rc  1317  m  ams  from  T322  m  ams  adopM  during  the  irrigation  Feasibility  study  Here also Ine simulations indicated that trie FRk a: 1376 m amsi would oe optima. The Firrr power increased to 22 MW from 20 MW identified during me end 0i frrigal'on Feasibility study This is with minimum operating pool condition of 13W m amsi and wnn lad waler at 1317 m amsi
*■ During me preset Feasibility study for the Irrigation cum Hydropowe pre eci the
r
Simulation? were rerun w-.m different options ana assjrnpi ans Firs? tne s muialto-ns were earned Ourt with minimum operating potf ai 1350 m amsi win ta water ar 131" m
amsll The firm pn-wer ar 076 FRL condition nceased !□ 23 “5 MW This was a je ta re
'"l"    a in, * , J,p _
‘Tl^- ... _ . aJ,        . _„a
5>rnu ated far ttuj conaiuan ana i^e results jit as per Taole i oelfw
Water Works Design & Supervision Enterprise
In Association with InUrtMOatncaJ Coiuulixnts in« Teehnoctits Pvt Ltd
IIIfcjB Oede&sa Hydfipraer A IrrigBtlM Projcri
Meteorological & Hydro logitil FculbUlty Studies
Firm power at different FRLs (Minimum operating pool a1 13S0 m)
FRL                Possible Firm                Possible mstarifrd Capacity b> adopt ng fmatnsr          Power (MW                   0 60 H Plant Factor MW)
June 2009
1356 5 97
1356 7 75
1360                  10?6
1362              T3 25
1364              14 69
9 95
12 90
1790
22 08
24 46
1366 16 47
1366 17 94
2745
29 9C
-370               15 76                             32 03
1372 20 95
1374 22 05
1376 23 75
34 9i
30 70
40 00
Then finaJiy  during me end sr th. 5 feasitwhiy  study  me design considerations  warranted the summations to be redone for a minimum operat-ng pool condileon of 1353 m a*mi -nstead or 1 3S0 m am*! This simuW’&n was pertontied 10* FRl 1376 am si wffih first priorny for irrigation as «n a runs This indicated a marg-nai increase m Firm power tc 23 75 m 23 90
*■ Again aftfc compifflmgi rM Feas burly Report another exercise was earned out as 
r
Design considerations warranted Che Minimum operating pool ar 1346 40 m amsi The simutadOHs are jnder compietor Dy the tome of completing this Executive Summary Th>s does noi S^Gs* oranges in the Frm Power at Higher FRLs But m tne lower FRL ranges some marginal increase is noted
Thus me simulations *iart Wen earned out with different optuonsi alternatives as warranted by design c&nstderatiDfis Now dun ng detailed study fpr a pariiculif FRl confirmed Dy Geologies 
l-^d D« ?n qrr i£Hj -*"0 rtifirdeiing
a           r A. -nh ft* 1                   rf 1 *or_ *" m-yo "■allllon ^nT 1" ,~ -.«R
_
F om Hyorologicai ?iOt «t prewm (M optimum FRL wrlfl 23 90 MW Firm po*er s der-rf.e:
r
In i'l the sunu at on r «i$ [hn 4 rv& 1^ taiiOfl or a maj-sr reduction in r-e suo casm flow ct
u
Deaessa Tne pti?wil sui oasm flows JJ tu Abbly X ItKu! 14 Q53Mm d '-'J rn t,
r
reouCAd Id 1? 83BMrp Al S~tn Ims redaction □! t 39% is a meager one because 1 ’"r pfopoMd AfjS Dodesis bam
WttUr Worts Design & Supervision Enterprise
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1'Arjfl Dedtu* Hydrfljwwer t Irrigation Project
HcMorologlcal & Hydrological Feasibility StudJes
June 2009
Floods:   The   approach   was   to   estimate   the
vario
us   return
per
iod   flood
peaks   by   flood
frequency  analysis  and  to  estimate  such  flood
peaK
lewEi  corr
espo
nding  to
Probable  Maunum
flood  lews?  by  Hershflfllo  technique  coupled
with
synthetic 
und
nyarogra
pn  oeveiooed  by 
Snyder’s  method in the flood frequency  analyses  me Generalized Extreme Value dtetribui-zin (GEV) as weir as- Log logistic distribution were ejcpipreo The results of the later were selected ceca use at closer suitability  to Dedessa sub-basin The flood pears  corresponding I? saiiani return pwiMS are as notified oeidw
Return period (yearsj
2
5
Floeo pea* im'j’seCii 334
500
IQ
575
20
654
50
771
100
371
1000
1303
10.000
1946
The Probable Maximum flood had a peak  of JOOOm^'sec  For various  peaks  the respective flood hydrographs  were developed based on the US Sod Conservation Services  SCSj dimensionless  hydrograph development Technique wiln aue considerations  ol the shapes  ot observed Hydrographs
Design Flood: During the irrigation Feasibility for the design cd the dam spillway the 10 000- year return period hydrograph was  recommenoea instead of the Probable Maximum flodd nydrograpn This is because of aim ng at economy in a situation where tne cam over topping and consequent failure will be confined1 to the irrigation command and me aarr nsen withoui loss  of nyman lives  at a large scale The smaller return pan&d Hoods  flke 50 and f00 years return perioos nave oeen recommendea for design of coffer dam and cross drainage works m the command area The appropriate one needs  to be adopted for design of eacn component on rts merit
But however. m case the dam is to be raised up to 1376 m amsi m addition co larger storage and height at the downstream the powernpuse wil? giso be located in that scenario adopting PhflF will oe appropriate
Flood routing During the irrigation feasibility the 10 000- year return period hydrograph wn&n routed throijgh me ffrservoir becomes attenuated Such attenuations for a couple ci spi|lwa>
l---T*n-     ^-e “■ “|rJ?r*d in           5y: Vr
-
?-
pea*  of  1350m  sec  gets  attenuated  to  n  65m  -sec  tor  a  spihway  lengin  oi  t25m  Sufficient fixation of MWL and free board has teen taken tare ol in the designs
But in me case ol present position of a larger dam tne PMF was routed at FRl  1376 m amsi with a spillway of 125 meters The outflow is about HOOm 3'Set with a surcnaige of 2 50
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MemorologlcU & Hydrological Feasibility Studies
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meters above FRl  of 1376 m anW however this might ha^e to
be redone depend
ing upon
rne
farmed up parameters of the dam by Geology and Design groups
Sedimenlahori:  Suspended  secbmenl  concentrations  nao  wide
variations  Mlwetn
45mg.iit
to
167{1 mgi'lit in the sediment observation in me Dedessa sub basin
3
of the bam As suc-n sediment interference with the operation of the dam is ruled our
Water  Qualny  The  quarity  of  Deoessa  waters  seems  to  nave  no  adverse  impact  on  the irrigation and crops proposed
Training Needs' The phase of development of various river basms - a very encouraging At rn-s planning stage mere may  not oe encounters  due to nyproiogicai aspects  When rne basins become fully bevefopeo with various types of projects and with -different objectives with *rade off among them me real time operation of inese -components of the oasm system oecc-me very relevant A judicial operation of a mutti System will even off set expenditures on further projects Such appropriate judicial operawns  on reai time dunng flpoo or orougne syndromes  have immense benefits for competing floods or hoe over of droughts The various basin authorities will have to possess a team of nydrpiogiscs involves in the real time ooerations of future mufti systems in an integrated fashion The real time ooe ations will have to be aideo by modern sen
Relationships connecting discharge i flows* and sediment load were deveJopeo .n me region ter
me stations in Gutter Litite Angar Cabana and Abbay Rivers A1 site and regional approaches 
were oe*eiopea to estimate me sediment ioao at the dam site jsing the flow data estadisnea
With sediment density of i Zgnv'cc and with the assumption of bed ioaa at 15% of me
suspendeo ioao She annual mean total sedimem load at The earn site worxs out to oe 0 775
Mm’/year
The exer&se by  "Area Jncrernemai Method' of USER was  earned oui tor distributing rhe sediment m me reservoir storage The results  indicated that. the volume of the reservoir gers reduced by  IS 7flMm3 and 77 §6MmJ after 50 and 100 ^ears  of operation res-pecl-'vety  The new zero elevation as far below me proposed MODl of 1350m provioeo at higner level due to command area constraints  At this  level me oead storage provided is  074 87 Mm wnich is muen more than the sediment accumulation of 77 56Mm ootamed after 1Q0 years or operation
r
ware decision support system, ftood (oreoasWg network ano telemetry for data col-echo r ano transmission The personnel ihydrologisls j to be nvoiveo m Such future rea- :<me operations are to be idenlrfrao and provided training in these aspects in advance perhaps m U S on India Conclusions: As  such  Arjo Dedessa is a promising one with respect 1o irr-gatior and power development
Waterworks Design & Supervision Enterprise
Ju AssoeiaUgfi mih inffrcornreml Casidtull Ud Ttciiii?cra(5 Fit. LittAr)o Dedessa Hydropower 4 Irrigation Project Meteorological & Hydrological Feasibility Studies 1.0 INTRODUCTION
Juno 2009
Trie Feasibility Study tor Aqo-Dedessa irrigation Projeci nad already been fwiahzea cased on a detailed study  of the Meteorological and nydrologicai aspects  The various  aspeds  those were addressed are
♦   The data collection ara processing for all relevant parameters of Meteoroogicai and Hydroiogicai aspects
♦   Use of statistical Di-vanate linear or non-lmear models for consistency checks gap filling and extension of records
♦   Establishing the Water Resources monthly Time senes fo* 44 years as me Historical
Time Senes
♦   Generation of synthetic Time Series on monthly basis using a ARI type Stochastic 
Model
♦   Establishing the Time Senes of all Agro-clrmatic parameters like, ine Relative Humidity Sunshine Hours. Wind Speed Monthly maximum minimum and mean temperatures
♦   Estabhsnmg the Eto Time Senes for crop water requirement
♦   Estabbshing the Monthly Time Series of catchment as well as the command area r3 nfaii
♦   Establishing me annuai one-day maximum rainfall senes
♦   Estimation of tne various Return Penoo Rainfall as well as River flows for Fiooo analysts fox cofferdam Commano Area Flood Control and its Drainage
♦   Arriving at tne snape of tne MSign Hyorograpn
♦   Evolution of me Probaoie Maximum Rainfall to develop PMF Hydrograph
♦   Running 01 an Exce* based simulation model for vanous control levels using the Synthetically generated 1000-year long monthly time senes
♦ Analysis of the sed-ment load on a regional oas«s ana establishing tne annual sediment load at the dam sire then studying tne distribution of the sediment in tne l»ve ana oead storages of tne reservoir c-y USER recommended ‘Area increment Method
♦ Routing of the 100-year flood tor deciding tne he»gnt of the cofferoam similar flood routing of tne 10000-year return period flood for oecidmg tne Maximum waler Levei of the oam and the length of the Spillway
♦   Evolution of tne Agricultural Drainage Duty
The FeasiMity Study of the dam and appurtenant works had oeen planned and des gnec Dasicaity for providing irrigation m a gross command area of about 17 825 na located on both bar«s of river Oedessa downstream of the dam Based or detailed Meteoroiogica* ano Mydroiogicai Studies the values for design decision variables parameters and control levels 
hao oeen fmatazed as follows at the irrigation Feasibility leve’
Too level o< dam crest
EL 135CE m
r W- 1 '’■'Ol' 1 wHi Level
Maximum Water Level
EL 1358 6 m
MDOL
El 1350 0 m
FSL ot Canai on either SKJe -
EL 1348 0 m
Gross storage
1341 6 Mm
Live Storage
476 5 Mm
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Meteorological & Hydrological Feasibility Studies
1,1 EVOLUTION OF THE CONCEPT FOR POWER GENERATION
June ZOO9
At (he Feasibility level study of the Arjo Dedessa Irrigation Project rt was confirmed by 
S*nuiation Studies ihat the contemplated irngat*on would be successful at 80% rehaoility This 
was for the given Hydroiogy and me reservoir geometry firmed dp curing the above Feasibility 
study for Irrigation development At the concluding stage of the above Feasibility study me
concept oi generator of Hydropower at (he Arjo Dedessa dam triggered of lor the following
reasons
* The water resource available at the oam si(e is 2477 10 Mm' ;as per .aresi estimate m (he Pre-feasibility  study  i Whereas  the maximum consumptive utilization oP me Irrigation development >s to a maximum of 200 Mm-' only As sucn rhe genu ne tjuestior arose namely  "Why  rwt lhe excess  water over ano aoove the irrigation requirement could be utilized for Hydropower generation al an optimal level7"
•     Raising tne FjII Reservoir Level iFRlj  did not show any negative impaci at tease cased on  Topographic  considerations  in  addition  to  support  by  hydrology  to  accommooate  a large*   storage   for   Hydropower   generation  in   an   optimal   way   along   with  irrigation development
12 THE PRE-FEASIB1LITY STUDY FOR IRRIGATION CUM HYDROPOWER
PROJECT
Th* 5'muianon runs  were continued ro explore me hyoropower gene*a:«on with me reservoir neigm as  lined for jmgation Feasibility  This  moica-ea that after satistyrng me irrigation me Hydropower generation with FRL at 1355 meters  was  a meager 6 MW at 97% exceedance level This discouraging seen ano diO not y^eid more than 7 MW and B MW even al 65 % ano 50% eaceeoance levels As sucri it was inferred that (here is no other arlernative except raising me FRL o* the dam to tevtJs  even up to 1380 meters  to explore optimal Hydropower generarion Some prefimmary simulatron runs were made TO arrive at this concmsior during tms stage
As such to examine lhe comomed feasibility of irngaiion cum Hydropower generation the Pre- fea^bilny  Study  for Meteorological and Hydrological aspects  was  unoenaxen The inflow time series  at 1he dam site was  updated after a very  careful review and consistency  checks  me other parameters connected wnh Meteorological components have been reviewed and a set of screening level simulations  coupled with a firmed up simulation has  been run using a tailor maoe Fortran source coded model. 'Aqoiim" ano Ms Excel cased firm up model
Tne preliminary simulation cased On r-.ydroiogicai toocgrapmcai irrigation development downstream mandatory releases and reservoir losses const amis mgic&Md mat me FR_ □- me
r
rese'voir zou □ be raised uo Cd 1378 melers as an optimal alternative td -generate a cont n^dus 
*- * -■
"5 W. ?u -icn ■ ■
“
j---
■nstalleo  capacity  d  35  to  40  MW  for  firm  power  consideration  The  Irrigation  nterests  were aisu sa e guarded iOO'% in the firmed up final simulation runs
f
1.3 PRESENT FEASIBILITY STUDY
The Present feasibility study is for estabfcsmng me .rrigabon cum Hydrooower Feasibility on the Meieoroiogica> and Hydrological domains The stuOy warranted tne analysis, panicuiar-x on
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June 2009
Simuianori  runs  lor  (he  power  potentis  assessmeni  recasting  ine  inflow  umt  senes  at  t*e  dam
site  and  redoing  ’he  flood  routing  for  1he present optima*  FRl  of  1376  meters which are the
maun  new  acWrttes  For  me  increased  neignt  of  the  a  am  me  earlier  adopted  iDOOC-year
Return Period cntaria needs to be changed io PM'F criteria in view ql higher heigh? and storage
and the locaiion df Ihe powerhouse in the yusc downstream The revised analysis on these was 
also io be jndehaken
The ocher aspects on ihe Meteorological aspects Agro-chmatic aspects Return Period Floods 
Flood Frequency analysis and sedimentation studies did nol cab fo* much cnanges Hom the
irrigation Feasibility Siudy excep-1 a nmrted data up eating
On the review of Previous studies maae on the Aboay basin and particularly on rhe DedessJ 
Sub basin, a very exhaustive presentation nad peen made in the irrigation Feasibilny Study 
however since i! stands approved already and above all as it does not require any up dating
this particular seciion is not presented in Ims Report
For those aspects wnich have been already approved in the irngauen feasibility level ano
which stand wilhout any changes lor the present Feasibility for irngglLon cum rlydrooowe^ cnly 
a orief description ano presentation are made n this report However lor me aspects which
nave changed because or converting the Irrigation Feasihikty 1o Irrigation cum Hydropower
Feasibility have been dealt wun m oeta;i
Water Warks Design & Supervision Enterprise
Ed IssocLlliUlWllli EaLucnqtiaciiUl CebsuJim le uid Tectlrtcciats Pvi UdArJ o Dedessa Hydro^tmr^ Irrigation Project Meteorological & Hydrological Feasibility Studies 2.0 THE RIVER BASIN AND SUB BASIN
2.1 THE NILE BASIN
June 2009
Having a rength of 6 025 km lhe Nile River Cakes  the rank  of number one with respect Co length m the world it drams a iota- drainage area of 2 96 M Km1 with its annual torai flow of about B4 Sm" As  one cousa appreciate the discharge per Amfc is  small when compared to other large rivers  of the world Fram the Lake Victoria to the Mednemanean Sea me river crosses  yery  many  different areas  associated wito different climate relief anc  geology  Tne main sources of the river are the equatorial -ake piateau and lhe Ethiopian Highlands The inree major tributaries  which emanale from the Ethiopian Highlands  are from south to me norm me Bare Akobo. lhe Blue Nrle fam liarly known aS Abba^ and the Tek«ze -Atbara System
The Abeay Basin is pernaps, the mosi imponarn basm m Ethiopia re accounts for about 17 5% of Ethiopian Jand area 25% of its  population and 50% of rts  annual average surface water resources In the Lake Tana, it has me country s largest fresh water lake covering an extent of 3000 knf The Atibay  has  an average annual run off of anoul 50 B m* The rivers  of Abbay conirjpure on an average 62% of Nite nve flows in Aswan dam
r
Two features dominate the climate of the At bay Basin, namely rt s near equajorial locairdn and
m altitude range between 590 m amsJ ano 4000 m amsi These influence result in nch variety of local ckmaies ranging from hdt'cfeseri Pike along the Sudan border io the temperate lype on the  nigh  plateau  With  depiction  of  cold  m  Che  nigh  mountains  The  Basin  can  generally  be descrioeo as temperate at higher elevation ano tropical at lower eievakons There a & mainly 3 ramy  seasons  The  main  one  (kiremlj-  rasts  generally  from  June  lo  Septemoer  during  whicn the southwest wrnbs bring rams from the Atlantic Ocean Aoout 70% lo even up m 90% of me ramiall  occurs  during  this  season  This  season  obviously  is  associates  with  minimum  e^eis  or sunshine  low  variations  m  caiiy  temperature  ana  high  relative  numudrly  A  dry  season  -Begai lasts from October to January during which clear shifts are associated wrth maximum sunshine hours H-ign daily lemnerature variation and low relative humidity Finally rhe rrnnof ra^ season iBeig.1 lasts from February lo May during which southeast winos bnng rhe small rams from sne Indian  Ocean  The  temperature  range  is  very  high  m  this  season  The  precise  timing  ana duration  of  rnese  seasons  vary  considerably  depending  upon  ipcahon  wrthin  Apoay  Hbuh  a^a to some lesser extern year lo year as well
Generally speaking the iow altitude depicts the pattern of 11 5 Io even 12 5 hours of synsmne
and the temperature varying only for a small range from 3°C io 7X through put the year
The mean annual rainfall over tne entire oas^r eoulo be reckoned at 1400 millimeters wnere as the mean evapotransp*rawn js about 1300 millimeter tA/rth respect to the hydrographic scenario lhe Bas>n 15 domrnaled oy Abbay River wnicn rises in the center of the catcnmenr
and deveioos its course in a clock wise soinq: ir oaNacis iribirtanes aiono
journey up to Suoan oorotr
2.2      THE OEDESSA CATCHMENT
The Deaessa River 1$ 1h& largest tributary of the Abbay in terms ot tne volume of water contribution to the tola- flow o< Adbgy at the Suaan border Dram mg nearly an area ol 34 OOC square kilometers ine Dedessa River originates m the M: Venmo ana Wache ranges 
fldwmg in ar easterly direction tor about 75 Ki&O melers then turning rather sharply to rhe nonn Water Warks Design & Supervision Enterprise
In Ansoci-stl-un with btHTonnnenui tonsil mats and TEcfinocriu Pn. Lid
-
4Arjc Dedeisi Hydrupawn-4 Jiniriuon Pwjjtt MetBPRlpgicaJ j Hydrological Feasibility Stuffs
June 2009
-inlif ie  reaches the AobSy River The major Inbu lar.es of the Deaessa River are rhe Warn 3 entering from 1na easr the pabana from the wnl, ano rhe Anggr from the mH
Dtdessa Catchmanl is sriualeo in the southwest pari of Atjtiay Safin The Gatehment area a? a gauging stairon near Atjo town is 9 931 km:  Th& catKfimant area at the proposed dam Site a 3632 64 km ' The plimale of Ina Dedessa CatcPmem result 5 from its locarian and elevation 11220  (0  MJ12  mtrieri)  The  catchment  15  Characterised  Dy  tpountlinoul  nigniy  rugged  ana disserted1   topography  with  deep  StoptS  The  lowest  pan  of  inf  cattriment  .5  charattor.jec  o> valley floor w-'tn fiat to gentle slopes
Mtll of 1ne rainfall IP me Ctepessa Catchment is conoeniraied to the June to September period imth virtual drought frflm November Ihnpugh FeorLary  Annual totals  average from Hess  lbw 15Q rtenlimelerS to more than 2CC centimeiers The Deoessa catchment bes des reflecting a
fnMwd ramfaii increase wiih higher aiwntiqii also receives  heavier annual quantifies  man most of the carcnmenis m the Abbay easin Examination of me ramfa.'i records from crus area ghpwj [hat this  is  pub 10 a longer (May  through Octaberj ramy  season, rgtner than heavier maximum monthly quantities
Th» mean annual flow df DedeSsi Rivfrr at AfJO Staton IS arjqjr 3 QOC million m npv.ng ns max'mum flow m AuguSl and September -52 percent of me annuatr add min. mum flow m February and Marcn (less man 1 5 percent of the annuatj
Water Works Design & Supervision Enterprise
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3,0 DATA BASE
June 2009
For toe sOuQy towards tne development of the Dedessa sub basm the qa?a. on climate nver Hows  and sedimentation become relevant with respect 10 Hyoroiogicai Modfefing ano tracer Resources  Planning The database stands  establ shed up io 2DD* Irom 1960 thus  farming Time Secies of 44 years length ai required time resolution reveis Statistically th>s much sample length is  adequate However for up dating the data, necessary  up to dale data are under collection lew effective utiiizanon m toe delaileo design phase
3.1      CLIMATOLOGICAL DATA
The chmatoiogica« data like sunshine duration relative homuMy  wino speeds  lemperaiure in true resolution levels  of monthly  means  of daily  means  monthly  mean of daily  maxrmum and monthly  mean of daily  minimum, become very  important parameters  with respect 15 mt proposed com-mana area development These in association with command area rainfall form the basic inputs for the estimation of the crop water requirement exercise A viv»d analysis had been carried out tor the irrigation feasibility
3J RAINFALL
The rainfall reou'res  critical analysis  lor the dam site and the upstream ror appreciating ana deveiop ng floods  eitner as  a fun hydrograph or in the form of flood peak  rale expected at different Exceeaan.ce prooabHity levels ireturn periods} The ramfall oaia needs to oe analyzed m iis various forms li-e maximum gf observed ' 03/72 nay or 3 to tS- days va ues or as a time senes  of ooservea annual maximum 1 day  rainfall or as  monthly  • tortr>igntl> totals  as  pe* analysis al different stages The analysis has to unaer tafce me gamoit o1 snort duration rainfall intensities as well *n connection with oes*gn of drainages and return period ramfall peaks lor me design of flooo control works m the downstream of t*ie dam in ana m toe vicinity of tne proposed commana area
3.3       RIVER DISCHARGE
Likewise me river flows  oata time series  preferably  on monthly  or fortnightly  time resolution leveis  forms  tne fore runner for establishing water resources  availably  lor performing Simulation wnecner as  basic  histoncai time MfiM or inairectiy  rhrougn synthetically  generated time series  I mostly  generated by  a stochastic  generation senemd where as  Che same flow oa’a has to be analyzed in a different form as discharge /flow rales instead of flow volumes i with respect 1o flooo; analysis
3.4        sediment DATA
The sediment data >$ obv*ousty required to plan the size of tne storages tor apportioning tne active and inactive Storage spaces and tor determining the revised qeomeiry of toe storage
relation i$ used in me simulation mode*mg The water qualify is a'toiher aspect wnicn needs to
be aooresseo in Myarosogicai study along witn tow flow analysis tor manoatory downstream releases cioseiy associated with the concerns of environmental and ecoiogicai aspects
With sucn appreciation oi me framework, q1 hydrological siupies ano modeling the o-sraoase was esladiisnea dunng me irngwon feasibility study
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Meteorological i H jdnloglcal F< tstblllij Studies
4 ESTIMATION OF CROP REFERENCE EVAPOTRANSPIRATION 4.1 CAUSATIVE CLIMATE
June £003
The Climate of Itte Aljo DeMSSa caichmeni results from Us location and e.eval on |13M to 3012 meter Si The list of stations far dbservatnnt of metton&lOfltcHl dais along wi|h length of records ana availability of data typ&s is given in Tatue 4 1
Climatic  dais  far the project ire a sucn as  temperature relative faiTHfity  sunshine hourjs  ,-md speed and rainfall nave Peen collected ano reviewed Consistency  tests  data rectification ana other adiuscments  Kwe been perfornned as  necessary  data gaps  haw teen Alien using interpolation and co-neiatians methods as apprcpnaie
The FAO Panman-Morrteutti meinod ft mamtameo as  tne soie standard mernpo for ine carnouiairdr of crop reference tvapGtiWlspi ration (ETa)frDm meteorological dara The monthly ET $ determmea from temperature numrdity  wind-speed and syttsnine hours  dara COtieCied at Bamr Dar station The ET: calcLlaimn has  been carried Put by  means  di a computer modeling
The FAO Penman-ManrErlh equation determines  tie evgpotfanspiratiqn from I he nypotherica. grass reference surface ano pfOvides 3 standard IO whicn evapafranspiral-on far vanous craps growing fn the Arjp-Dedessa project command area can be reiaied The methods  far caiculaling evapQlrtnspiHliGn from meteorological rraia require vartaus  dimatmogicai ano physical parameters  Some Of the data are measured diretfy  in Ban ■ Oar metaCFWg'Cai station Other parameters ar# raiated to commonly measured aata and can tje rWrwd wtr me heippf s CTree’ or empirical relalionsh p
Hie meteomiogical faciors  detecmvnnfl evapotranspiration are weather parameters  which orourie energy  tor vaponzalion and remove water vapor from the avaporaimg surface The principal weather parameters  i& orwider are presentee oeiow The data obtwnid from lhe Bcofte Dedtssa ant jimma stations  were assumed dHractiy  applicable la the rngawn derttopment with aopi cabfin of appropriate nfarmatiOn Pansier mechanisms
4.2      METEORQLOG FC A L OAT A
4.2.1 Meieoroiog its i Obs ervan pn Stations
Five meiMroiogitai Observation stations are locaietf m and around 1ne A/jo-Decassa Imgattpn Pra.ect area These meteorologcai data are obtained from rhe Nairpns- Meteorprogical Services Agency  'NMSAi Out of these Jsnma is  Clan 1 station [bar include Observations  of raipFall temperature relative tiumid-ty  sunshine duritnr wind speed ano evepwaoon Beoete and Deoessa are aisc C ass ' stations Put OG not include sunshine duration In addition Agaro ano
Of'1  & ar# C:ass 3 sionons mar meude Observations of
J
ra n ah ano temperature The iongesi
j j,- b^  .1
L . VP rff — rfi- - -s’ - — - —1 -4 -3,4 “Z]         -|
i| - Li“;-, -■* I r-jsirf-i - fini ja - ■
reinfa ana temperature data since 1952
The oera is ike locanon altitude year gf estetiksnmenr Hong wdh their class are avail ad-re r T iDie 4 1 The types of mereamlogicai aara available at tn#$r station? aiong with me tengm pi data are given «n Tatne 4 2
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June 2009
Chrnaiomgicgi dai a obtained from Bedel* Dedessa ana Jim ms ^lation-a were found to be the most re abie and recant for use in 1he analysis of rainfall for the inigatgn command Beoeie is geographically  the closest station to the command area Dedessa stall ar. and the. tommanc area a*e totaled at me sa^na eievaimn (i e both 1330 m a s ij J.mma station i, winch is Class h has me longest record Of all the stations wihm the neighpumgoo gf |he command area sous tc oe mdax station m extrapolating and irnerpoiai ng mi 551 ng eng shod term dim sue data rafevaffl 10 me Axjo Dwessa catchment and comm ano area
4.2.2   Air Temperature
in me project i^rm area, the mejri mgmiy lempevature variations throughout me year
minor being 20 O’C in December 10 ZSflC in March The mean monlniy temperatures of the command area 15 governn Table 4 3 and graphically illuStratM by Figure 4 1
4.2.3   Air Humidity
Mean humidbty vadutfi vary between 56 63 percent m Mirth Ip 8S 63 percent m September The mean monmly  humidity  □! the command area is  given m Table 4.3 ano graphically dlUSJFSied by  F.gure + 2 Data ot humid ly  have wen used in estimating wapptranspaolton iaies from reference crops
4.2.4   Wind Spaed
Mean w-nd speed values vary in me range of 0 4& mater per second m Novembw and D 6
■neter pv second n Apni The mean monthly wind speeds fll lhe command area are given m Taoie 4 3 ana graphically iilosiraceo by Figured 3
4.2.5   Solar Radubon
Mean Sunshine Oufangn 15 £ 3 hcun -n December ancr is reouMd td 3 7 hours du rung July The mean momniy sunshine durations 01 the ntnttand area are given m Tatve 4 3 anp grapmcaliy illustrated by Figure 4 4 Dara Ot sunstone hours have oeen useo m estimaimg
evapOL'an^piralKin rales tram reference crops
4.3 PENMAN MONTEITH EQUATION
From the oogina Pfcnman-Morrtertii equation md the equiUOnS of the aerodynamic and canopy resistance the FAQ has esracisneo tne Penmafl-M&nCeith eqLarion Using Ih.s tne Eio was rslaUHsheti as a Time senes
Table 4 1 Tabs Details of Meleoroiogica Observatwo Stations tocaleo m ann aroung the
pro|ec! area
S No
Station
Name
Latitude
Longitude
No
rth
East
Attituoe
■fFTQ
PeruMl
-
j.
+■.
—J
■n
1
Agaro
0"
51
36        36
1700
1990-2004
2
0Meie
06
27
38        20
2005
1967-2004
3
□eaes-sa
Ofl
13
36       C6
1300
1971-2004
4
Dernci
08
04
36        37
1950
l954*2004
_s_
Jjmma
07
40
38        50
1725
1 952-2D04
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MHeDroEngtaaift Hydro l
agicil
Fusibility
Studies
Jutlt 2flW
Table <.2: Types of Climati
c Oafs
available
at lie vari
ous 
Meteorolo
gical Observation
Stations
He       Station name
Yrs
RF
Tm
RH
WS
SD 1 hr 1 day Relay
Class
1       Deaessa
30
X
X
X
X
1
2       Bedeie
28
X
x
X
X
t
3      Dembi
20
X
x
3
4       Agarc
21
X
X
3
5       Jimma
80
X
X
X
X
XXXX
1
Yrs       refe< io rainfall senes RF         monthly rainfall
Tm        average temperature RH      relative numiduy
WS     wmo speed
so         sumhlna duration
1 hr maximum i-fiour rainfall 1 day maximum t-day rainfall RtJay number of ram days
Tabic 4 3 Summaries or Mereoroiog.;ai Characteristic* at P.p0|£C! Are-s
Jan            Feb Marcn April     May    June    July     Aug     Sept       Oct Nov          Get
Mean Temperate i.*- oC
Average    21 9         23 15 25 4 25 05  24 03  22 09   21 32  21 19   21 83  22 35 22 144   19 99 cv    0 043      OOM 0 036 0 065  0 071  0 029  0 020   D031   3 027  0 036 0 0544 0066
Skew 0 077 ■0 58 0 067 -3 828 -3 23 0 117 □ 275 ODD? 0 93 0 353 -0 118 -0 02 M.n 19.5 io 44 23 63 t6 26 15 89 20 96 19 99 19 88 21 DE 20 19 19 081 16 92
Max       24 6        24 9 27 37 27 72  26 19  2341    22 72  22 J4    23 2   24 25 25 05-   22 60 ReJatrue Hurmdity |'%J
Average  64 77  50 97  50 63  67 97  75 72  01 07  87 46  03 52  80 63    54 55 79 366 "2 44 C-V     0 099  0 127  0 084  0 073  0 053  0 047  0 061  0 040   3 03     0 053 0 0705 0 039
Skew -0 2? -0 27 -0 37 0 474 ■0 2 ■0 87 ■2 92 ■2 0 249 0T9 0 267 -0 13 Mm 51 5 4j 2 45 09 5" 42 65 23 65 0 51 77 72 23 52 49 74 24 67 667 55 37 Max 77 3 71 68 64 OS 82 17 B6 10 90 3 98 l 97 53 95 67 94 73 93 107 66 13
bVintf Speeo ^rrvsj
Average   C 62     0 6      1 0      l 08    1 G4   □ 06    0 62    0 51      0 5     0 51    0 48     0 51 Surr-sfime Hours ffrsraayj
rt .erage £ ’56 ’£35 ’452 ’ 297 7824                  6 061   3 703  4 059  6 *64   7 855 0 3245 8 306 CV     0125   3 T66  0-.45   C 165 0157  C 189  0 243   0 23    0 22   0 139021 39C 304
SMW    -0 47   40 36  -0 2?   -1 12   0 141  -0 35   0 248   -0 42   -0 27   0 138 -3 525 C97i
■ r'll"                    . .z    - ,UJ    *T       _ _ _   _ ■ _ j             2 _        1 n                r ’"■ ~        " ■ J. 10     9 015  9 744   9 44    10 15   8 12   5 445    62      9 1?    10 08 10 201 11 02
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Table *.4 Summary of Estimates Mean ETo o Arja Dede&sa P^bject Area
June 2009
f
Jan Feo March April May June July Aug Sept Qce Nov Dec
Darfy Estimated ETo {mm,<Jay)
Average
37
4 11
4 62
4 51
4 33
3 58
2 96
3 11
3 81
4 03
3 79
3 44
cv
0 05
006
0 05
0 07
0 00
006
006
0 08
0 09
006
0 12
0 05
Skew
40 47
^0 77
^0
-0 95
-0 65
-0 TO
0 33
&51
'0 18
-0 27
-3 11
Dflfi
M.n
3 23
3.3®
3 99
3 44
3 35
2 97
2 55
2 44
2 88
35
1 95
3 Tl
Max       4 03      4 4?     524       5 13      5 C6      4 15      3 46     3 59       4 49     4 47    4 24      3 96
Morrrtty EsUfnatod ETd
i m rrtffri Mtty________________________________________________________________I
Average cv
US
115
T43
135
ID?
91 8
96 5
1t4
114
107
0 05
□ 06
0 05
0 07
134
008
0 08
008
0 08
a OS
125
0M
0 12
0 05
Skew
-0 47
-0 77
-0
-0 95
-0 65
-0 19
0 33
-0 51
-018
-0 27
-3 11
0 88
Mm
100
94 8
124
103
104
89
80
75 7
88 5
109
58 6
96 4
Mbjl
125
126
162
TM
157
125
107
IT!
135
139
127
123
fjrj/nafetf Eto (mm/dayj (form a/erage ^atues of aataj
Average 369 4 08
4 58      **9        4 20       3 57     2 95     3 TO     3 75      400     3 79       3«
Estim
ated Eto mm.montni
form
at'pJ'Jje vj/ues of dat
a)
Ave.-age 114
114       142
134
133
107
92
96
113
124
114
107
Note Total annual ETo ■ 1397 mm
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Fig 4.1
June 2009
CliiEribMli^n pl Mcminn M fn
Fig 4 2
Monthly Main Relative Humidity
V
T<-mpt rjturr orar Command *r<*
F>g 4.3
Fig 4.4
Variation of Monthly Mean HKn-d ipeen
Over Command fl Fea
Mean Monltiiy Sunanina Humf<
Darial*or* over the comm ano Area
Fig 4 5
Monthly ETo VjrMtM>n d¥cr the
command area
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S O RAINFALL ANALYSIS
5.1   THE ANALYSIS
June SOM
During the Faasrtiilrty  Study  for int irrtgatiMi Project very  elaborate Rainfall anaiys-s  nao been carneo Ou: and gm approved No* wi1n data updating there IS no variation in th* eulwr study results However a brief presentation o? the saHant results is pi^sMled in this section
The ramfall aatd obla had tram Beoele. Dedessa ano J mma stations were fauna rc oef'i? most rehaoie and reievanl for use jn the analysis al rainfall for 1he Ago De cress a irrigation prtJjeCI Bede e n gecgrapnicaJiy me closest staiicm to cne eamma^o area Dedessa station ano me commano area are twated at the same eievaoon [i e both 13JO m asf> j'mma station . which is Class II nas the longest recrxO di all Ihfi Stations within 1ne neighDCKhflda Oi cne command are i
c
So as 1a be index slalom ih OxirapOiatmg and interpolating missing gng shortage flf rafrlfll oaia
relevant to the Aga Dedessa catchment and command area
The ramfall m the Aqo Dettassa Catchment as wen as m its surrounding ns un.-moda. type
Mow of tne rami^ll IS wncentraleo m the May to September covering with nduBl drought from
NdYWnbflf througn Marqn The five wettest months Covei 63 percent of the tota, annual ramfall
T^e o'y season iwng from November (o February (four months; has d tola! ra nfgrl of aoout
7% of the mean annual ramfall
The mean monthry  iMifaljfor stations  m the projeol area ts  given in Title 5 i and their panarn S graphically  illustrated m Figure 5 1 The ength oi ramfall data collected from Jimma >
relatively  more reflate compares  to (ne data sec  Cbdactad from other stanons  because of ns long rpoorJ  length and Shorter ume interval of ooServaiion Deoessa and Beoele stations  also PfOrtfl# more reie^ani ra nlall cata th ar can oe aoopleo for |ne command area S nee Beaelc  s 
dOse  CO  the  praiecl  a ea  and  Dodaua
r
slatiQn  is  located  Wfltlin  Ch#  same  climatic  zone  as  Ena:  o'
me project area
The   annua   rainfall   al   salient   depentfaoilny   levels   IS   35   beiflw   which   is   based   nn   Regrona Analysis
Mean r ear
1*51 mu'iimeters
75% year
1130 milhmeiers
80% year
1090 miJIimet&rs 
90% year
$53 mdlinwers
Tne monrnly ramfall far uanaus exceedance prooabthty hevBls are shown m |h* Tab*# 5 2
5 2 RAINFALL INTERNAL AND EXTERNAL CONSISTENCY
Thougn   ■   good   database   had   been   uuthshod   for   rainfair   considering   Tre   cal   a   pf   tne   three Stations namely Dedessa Jmma gr>j Sedeic it tfi customary in Hyc^S-metfloralogica studies
1
»                      ■‘P
-J Ai] v -1 J .. □
3- U J- _
The Irena in Che annual ^amfall pattern is  a relevant SSptcl with respect ic  rhe benawM of the ramfaQ ano tp compare lutfi behavior w.1h 1nose O' njner relevant stations  fflvOhed m lhe study with a view to firm uo external consistency  Accordingly  a 3-year m&yirtg average analysis  was (■ken o1c eacn of me 3 siaNonj
d
p
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Jupe ’DOS
Similarly an analyses wiih respect to me crass correiadran structure among the 3 stapcns was 
carnto ou Tnen the smgie tnns curve analysis was taken up for each c< ti^ese 3 si?' cns 
These {Jia nul indicate any abnormality CO reject cms dais MH As such these amfaH data were
r
used m its different forms for various spectrum* of die analysis
5.1     ESTIMATION Of RAINFALL RELIABILITY LEVEL
Us*ig the rainfall for irngatiOH water requirement for tne command area requires [he estimates 
of Che magnitude and reliability revel of rainfall corresponding to various ramfall nme interna S
Annual maorniy and half monthly intervals were chosen durations for analysis
Ramfall     reriapHiry     level     and     magnitude     can     be     analyzed     by     making     use
or
[n&orei.cai
distributions   Jn   Ihis   Study   Me   Extreme   \ra.ue   Type   Ul   [minimum!   dismbutipn   wBS
utilized   The
distribution 1$ also Known as  the WfeibuU distribution or as  Gumbels  Lrmdeo distribution of the Smallest value Since aeradeo discussions  ware presented m the earner Feasibility  Study  the results utiame j onty are pre rented m 1he Table 5 2
5.4 ESTIMATION OF MAXIMUM RAINFALL FREQUENCIES
For interna, drams end smaller control wonrs 1he needs for various return period camfa'ls and with different durations were found to be necessary m genera- maximum ramfa I magnitudes cf intensity corresponding to vaJIPuS mum periods ior probao-hty -evels.i can ne esnmatea by replying the following form
|5lj
Where
l r « |m|1» CVK iTiJ
.. = ramfall intensity corresponding to return penoo of T years (mm m = mean of annual maximum intensity of ra nfa.l i.mm/hr;
Cv - coefficient cf varjalior of annual intensity of rainfall k.Ti = frequency factor
Fw Extreme Value Typft J ..or Gumbei si Dis1nbu1.on
K-Tj » -0 779(0,577 * in ln(T/((f-1)|}
The maximum annual 24-haur rainfall s&nes n given m [he Table 5 3 Ta die 5.1 Mean Monthly Rainfm
{5 2,
Description          Jan     Feb   March April May       June    July    Aug     Sep   Oct      Nov Dec         Total
Dedessa
ti c. >_i 'E x;
3        6         26       49      153     274      312      277     209     104     ae       a        1454
, g      23       H 3     1 >■«         ■- -■ ■      - —      j JU       * 4     ■ a u ■» 1  B —
Der”bi
25
44
’01
126    223
303
307
367
2*30
145
52       29
2013
Agaro
24
3G
u
53     149
232
23d
231
174
12?
54      3D
1471
Jimma
33
43
B8
T33    172
219
209
210
182
103
6B      36
1502
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Table 5.2 Monthly Rainfalls Corresponding to Orffererrt Re^iafrhsy Levels at P o/ed Area
Jun; 3009
r
Re I iabi lily
Level Jan F^tj Mar April May June July Aug Sepi Oci No* Dec Annua!
(%)
65
10 8 12 2 40 9 58 1
150
213
219
221
212
91 6519 6 7 58
1353
60
8 84 9 7935 8 51 7
137
198
211
210
203
0166 16 36 12
1304
65
6 92 7 4 30 8 45 3
124
184
204
200
194
71 "6 14 2 4 74
1253
70
5 5 0325 0 38 6
lit
1M
197
190
184
61 82 122343
1202
75
3 04 2 63 20 7 3. 5
97 9
154
190
178
T74
5T 68 70 4 2 16
1144
80
0990 16155 238
84,2
138
183
166
164
41 13 0 83 0 92
TOSD
85
0       0 9 97 15 2
69 4
120
177
152
152
29 88 7 38 0
1025
90
0      0 3 87 4 04
52 9
997
170
135
138
17 29 6 02 0
851
95
0000
32 7
73 7
163
113
119
1 974 4 02 0
853
Avg   15 3 18.4 53 6 69.5 180.8 243.0 245 9 238.3 228.6 115.5 3l 4 12,7 Tatite 5 3 Maximum Annual 24-hr Rainfall
H53
rear
(mm/d)
rear
(/nm/dp
Kear
fmmyd?
1967
47 1
1980
45 6
1993
501
1968
4? C
1981
1994
57 B
1969
640
1983
50 0
1995
61 0
1970
57 C
1984
51 7
1996
60 1
1971
70 0
1965
62 2
1997
104 5
1972
45 2
i960
64 6
1998
63 5
1973
35 9
1987
58 4
1999
83 D
ig-74
51 8
1988
53 2
2000
47 9
1975
354
19B9
46 8
2001
69 0
1976
47 1
1990
49 5
2002
57 D
1978
199’
87 0
2003
1979
45.0
1992
51 6
2004
3® 1
Average 54.14
cv          0 306
Skew      2E-04
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T^bfe 5 4 AtaNHTHIHI Rg.'nfafi Magnify and Frequence i
Reium
Peiod |T)
Frequency
Factor <Kj
Rainfali Magnitude f|mm|
24-hr
1-hr
2
-0<«
51
27
5
0 72
66
35
10
1 30
76
40
15
1.64
82
43
20
1 sb
05
44
25
2 04
88
46
30
2.20
91
48
40
2 40
94
49
50
2.61
SB
51
Fjg 5.T
1
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6.Q MONTHLY STREAMFLOW ANALYSIS
6.1
H
YDROLO
GfCAL
OBSER
VATI
ON S
TATFONS
Hyor
pmei
nc   ftBbons 
on   the
Dedessa
Rwer
and
Che
neighboring
nvE
. s   wit
r
hir
1
-'ie
Adb
af
M
SH
ana
the
Omo-Ghite
oasm
hac   also
been
ipeni'f
ied
The   hydrciggi
cg.
dele
we
re
ob
La
ne
e
frgrn
rn* rlyarbiogy fteparune-r of the Mirefty of Waler Resources -'MpuVR
There are two tygrcogicai observance stations ipcaieo on tha Ofectessa Riv*r Thnfe are
Dddonn near Arp town (Station No 114001) ana Dedessa near Demoi town . Sol-oo No
i 14014) Station 1 ’4301 with catchment area of 9?8i urn* is located about 44 km crow nsream
erf the proposed dam site and has become operational unce i960 wnere as Sration 114Q14
with a catchment area of 1806 km2 is l&oatea about 137 km upstHfan of the proposed dam; $ne
ard has cecome opereiionai since 1M5 The catchment ar the proposed dam sue is 5632 64
Km 1
Besides the two nyaratogtGai oh sew a I Fan siahons located on the mg.n Dedessa River seven nydratatycal observaiiQ^ sieuons are .ocaed on ns triouianes In add han, hytfcpjogicai
obseruation stations an the neighboring Dabao* near Aoasma (Station No 114005) .Si'gei Ghibe near Asstndaoo (Sranpn No O9TOO8) a nd'Gftjeti near State (Elation No 091012 nave
been found 10 oe relevant to the study
The  nsi  or  nydro-agtal  observation  stationsior  wmeh  data  have  been  ool  leered  gigng  with  piner aetais tike thaw .ocanon ano catchment area a available m Table 6 1
6.2      EXTENSION OF RECOROS
stream flow gauging Statons nave been ojallpd on me Deaessa RJw near Arjo (own .station '4Mli since i960 and near D*mt- [own iSteHon 1401* since 1985 Before rhe scream flow angiysu data Obtained from Station 114001 Dedesse near Arp. and Stanon 114{) 14 (Dedessa "ear Dembu wS-s ChMxed for temporal and spang, nom&getieity The nvesligalion c-r nomogunAty was concentrated mamty cm the OUlliarl 0l me monthly dale series of 1he record Extremely high or low ubiles of each WK teat has occurred at lime T (.,■ m exh month M was cnet^eo agamji the scores of th* month M fr-1. ano M (j*1j that nas OOCurrtO at me same year T ■ so as to fudge wneinar me fetation is sn;l mont 0* less the same as that at Ine Siner yvan Whthtvtf th# outliers wer* rejectee by thu test again another test wai performed with other daia series or Scab on 114(»5 .Daoans neat Abasma Statron 91006 .Giigei Gfilte near Attandabo) and Staiwn S1012 (&cpb nw Stab*) far the same perron T <■.
The data w#* checked far :1s crjnjrjtexy before it was Jtetf for diflemrl analysis The intaotigaten C«K*fflraMd mainly arine <JuB>eft ofthe monthly and paity. data ser.es Extremely n.gn or row vHun EhaH accused at 9 g ven Um* were cjiecneo agg nsi retards of other nee overt sjch as Dwte If me outers were found to be mcons^sicnr wifh others tner rhev 
tirere “ptd&ea Oj. dBht* stations
vvlutii ■ a. ..-± -
eg-af di,x ■ i
jC s uua i&_
6.3      SYNTHETIC FLOWS
it   was   reahzeo   that   me   specific   sequent*   ?f   histone   events   was   1   random   occurrence   ma, would certainly never occur again in me w.re way Ta gel some idea about other p$ss ofe
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June 2009
r        shown   by Tables   6   2   8   3   SJ   65   respectively   The   monthly   stream   flows   at   different   reJiabrlily   bevels   are available  at  Table  6  6  The  mommy  Time  series  of  Flow?  ai  Dam  site  are  provided  m  the  "aoie 87
T ne Flows at rhe oam s<ie a.i annual level are as be^ow
sequence   wirthrn   the   population.   in   order   tg   improve   reservoir   design,   generating   a   icng   stream flow senes is 3 nighty accepted procedure Dy hydrologists
The   stream   flow   record   length   at   the   gauging   siabon   near   by   trie   a   am   site   is   enry   for   a   few years   it   would   oe   posable   to   get   better   information   f'orr   the   synthetic   flaws   Synthetic   senes, can   fulfill   ats   purpose   rf   the<e   are   Jong   records   at   a   gauged1    location   on   a   stream   When   rne stream  flow  records  are  short  as  that  of  the  situation  at  the  project  area  synfh&nc  Flows  mat  are oases   on   statistics   of   a   single   sue   cannot   give   satisfactory   result   These   short   samples   contain large    sampling    errors,    and    these    errors    are    also    preserves    in    Ihe    long    synthetic    series Basically   synthetic   flows   do   not   improve   poor   records   out   tlwy   can   improve   the   qualify   of   the reservoir  designs   by  producing  sequences  of  high  or  few  flows  (OF  large  range  [hat  do  nor  exist m the ongmal record
In Such a Situation where avsila-D^e records are short rationalization approach would provide a
belter resurt Statistics derives from other catchments in the region can significant^- improve tne
required estimates
■in   ora   er   to   suggest   some   procedures   in   tne   application   of   rationalization   approach   to   synlnec^c flows   ang   obtain   |he   necessary   regional   statistics   required   it   was   necessary   to   cnc-ose   the   form of   the   model   mtendfrd   to   be   used   Accordingly   the   oesi   known   the   Thqmas-Feirnng   monthly modE«   was   chosen   This   is   an   ART   type   model   A   Time   Senes   of   1000-year   monlhiy   flows   were generated
6.4      THE RESULTS
Mean    monihiy    discharges    coefficiem    of    variation    af    month    y    flows    summary    of    regi&nai monthly   flow   characteristics   statists   of   monthly   flows   at   Arjo   Dedessa   Dam   Si'e
ae
Mean Annua* Flows
■ Annual Flows at 7$^= E"ceeoance ^&ve<
■ Annual Flows ai &&% Exceeaance Level
■ Annufflr Flows at 90% Exceedance Level
247“  ID  Mm  3 *750  00  Mm  5 1635 0C Mrr 1390 00 Mm 3
Tabn? fi ;          4 varJabitty of Stream fflow Dafa rfi me Re-gym
Si
Nq
St.
No
Station name ana toCaHofi       Lai North
Long
East
Area
1
(Km )
1 - 1 « "■ 1        "i Ma - :a :■ -A
Flow
(MmVyrll
Runoff
(mm)
’
• »       ■■“ - —i «   n ” -7
2
114014
upper Dedessa near Demoi
0 02
35 29
1806
i22i
576
3
114005
□aoana near patina
9 02
36 33
2291
1870
820
G -igsl Gi^ne Aw
4
091006
Asenaaoo
’ 43
37 11
2SW
1211
438
5
C91012
GOffib nea Snebs
-
7 25
36 23
3494
1003
516
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June 2009
3
St No      Jan Feb    March April May   June   July      Aug     Sep     Oct     Nov     Dec      Annual
41 9 26 7        26      33 5 63 6         216        646      1050      902       526       140         80?      3781
114001
122 95            11 5  16 9 36 4        1124       228 9  306 9 262 8       154 J     48 4      20 5      1221
114014
114005
051008
901012
35 4 19 fl
T6 3
17 0 35 1
107 0
258 8
433 0
473 4
313 9
103 3
56 6
187-3
14 7 13 5
12 2
15 9 33 9
100 3
216 5
3192
277 0
13?
60 2
24 5
121 i
51 3 22 1
221
31 3 86 4
169 2
323 7
4156
400 9
202 3
82 8
40 5i
1803
Fabfe 5 3 Coefficient of Vana/tinn of Monthly Discharges
St No
Jan Feb
March April
May
June
July
Aug
Sep
Qci
Nov
Dec
114001
0 51 0 57
0 66      0 60
0 62
0 45
0 35
03
0 33
0 67
0 62
0 59
114014
0 47 0 5
0 40      0 56
0 69
0 53
0 29
0 27
0 30
0 56
0 01
0 53
114005
0 20 0*2
0 33       0 43
0 60
D 47
0 20
016
0 25
Q 44
0 30
0 34
091008
0 46 0 58
0 78      0 45
0 43
0 36
0 22
0 28
0 27
0 61
0 79
0 58
901012
0 79 0 36
0 34      0 43
0 63
0 44
0 31
0 26
0 34
0 49
0 54
0?0
".JDl'e -6 3 Sc/nflmwy o/ ffeflronsf mpnfffly flow GfWaCfeflSftCS
Param
Fear
Jan
Feci
Mar Aoni May June
Juty
Aug
Sep
Ocf vt.
Dec
cv
194
0 51
0 68
0 595 0 58 0 61 0 <7
0 33
0 29
0 32
G S0 0 65
0 57
S*ew
151
1 80
1 80
1 503 0 86 1 65 1 05
0 12
07
0 59
0 94 2 19
2 02
R
194
0 30
0 57
0 527 0 45 0 49 C 66
0 53
0 56
OS'1
0 5 0 56
081
£1
19*
0 34
0 78
0 46 0 44 0 52 0 5t
0 37
05
0 56
0 91 0 64
3 Ad
latke 5 5          Sfafi£f.ms of monfWy /taws at Aflio £te crtrssa Ja»7T s?ft*
Sfdev
Sh#
A
(in Million m )
Param Jan Fed Mar Apr May Jun |Jiil Aug Sep Del Nov Dec Annual
Average 26 41 1" 53 10 5423 2950 02 163 07436 30575 24 566 23320 05118 1850 30 2477 10 12  Bl  9  72  11  0216  41  29 69  70  67   143 2    109 5    179 2    180 5    0? 38 27 17      619 3
0 626 0 7431 067 0 9371 6-29 0 091
0 125    0 037    0 254    C 585   1S65 0 96        0 490
Mix
Mm
59 09 40 3 40 0i 68 61 144 Q 366 1
781 5
I Da 3   905i
661     40C B -20 1
4089
6 806 3 462 1 7754 506 9 685 35 71
T43 5
296 2    195 6
49 32    12 69 4 90S
1124
Water Works Design & Supervision Enterprise
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Hetwrotoglcjil & Hydrological FMJftiUiy Stndles
Table 6 6 RWEaiWy Letef V$ Manffity Smsm flows ar Dam Srfe
Mm 3)
Reliability
Ue*el
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Dec
Annual
W
55
20 2    12 7
14 1
193
37 5
131 4
371 1
568 8
480 4
239 0
75 6   35 5
2114
50
19 0   T1 6
130
174
34 7
122 3
343 4
542 6
454 6
2166
69 9    33 2
2019
85
179    106
120
155
32 0
H3 6
32S3
516 7
429 0
194 7
645   31 1
1924
70
169     9 6
11 0
138
29 5
104 9
301 3
490 6
403 3
173 1
59 6   29 2
1828
75
16 0      8 7
10 1
11 9
27 1
96 4
276 0
464 5
376 9
151 6
55 0   27 4
1750
80
150      78
92
10 1
24 9
87 a
248 5
437 3
349 4
129 7
50 9   25 7
1635
05
14 2      6 9
63
81
22.6
78 9
217 8
406 3
319 0
107 0
47 0  24 1
1512
90
133      6 1
74
60
20 4
69 5
181 2
376 4
266 7
82 5
43 5   22 6
1390
95
12 5       52
65
35
18 2
59 0
132 1
337 9
246 0
54 4
40 2   21 2
1224
A^g 26 41 17 5313 5A 23 2950 82 163 0"436 3G676.24 56^ 23 328 05118 15 50 36 2477.10
Water Works Design & Supervision Enterprise
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Meteorological & I- drological Feasibility Studies
June 200$
lubkt
Maintli h Flaw* nt l)am site A, 11
in Million C wbx Mclrn
SI No Year Sept Oct
1      1961-62             900 0            661
2       1962-63             700 8          512 2
3       1963-64             622 8          223 9
4       1964-65             70S 4          621 4
Nov
291 6
Dec Jan Feb Mar Apr May June July
101 4 34 G8 18 98 19 47 ' 507 21 39 157 2 397 6
64 92        31 95        22 7?
12 3
-je- . ■_-L
12 28     30 86
i
1116’   235 3        429 5
111 8        97 23         7 64      24 32      17 86     24 21      41 69       167 0        670 0
Aug Annual
560 6          3169 19
826 3         2990 73
784 4          2792 85
307         42 03        33 05      16 1 ;     11 28     34 56      21 07       122 1        532 7       633 6           3080 29
5       1965-66             4103           573 5         194 6        90 12       42 41       40 3      39 61      53 61      47 41
I
134 3J   547 5      554 6           2828 26
6 1966 67 726 3 49 32 25 38
7 1967-68 7195 634 8 400 8
e 1960 69 399 62 222 2 77 51
9 1969 70 565 3 174 2 53 01
11 62         681        5 36      15 57      14 73       19 24 1       82 14|   452 6      764'7|           2173 77 120 1       18 95     12 57     13 26      17 23        38 17 '   117,13     304 88       468 52 ‘     2865 91
BU U _ — — J
34 45         30 4      29 71     46 01 ‘     28 69        55 55 *  253 9          607 0 '   857 0 |      2642 04
26 41
10      1970 71             673 2           121.1          1102        35 46
11      1971 72             566 4          450 3         184 8
12      1972 73             430 7           1254         71 09
13      1973-74             839 1           354 5         90 45
14 1974-75 195 6 83 73 72 32
15 1975-76 308 02 216 2 75 42
60 15
29 96
20 38      5 35
221       10 44
31 3      18 92
9 25      24 21         34 36 '   209 3
7 45 '      9 02         40 6       175 5
1343     25 76      42 79       8561
593 4 635 7 2351 67
525 6 708 6 2439 27
512 9 746 2 2740 58
15 44      7 12       3 22        4 59      82 96         181 5       156 2       633 0           1741 2
37 0 21 79 1031 9 09 6 56 71 15 1900 409 5 770 6 2810 85
27 9 10 44 12 23 129 16 76 35 19 11396 296 64 455 66 1341 53
33 52
■■ MU
23 04 15 29 16 13
• J1IJI— ■■
20 95      43 99     142 45      ' 370 8     569 82           1916 43
16 1976-77 486 03 270 25 94 23
17 1977.78 556 11 309 22 107 87
41 9 26 37 17 5
47 94 20 74 13 76
10 46 23 97 50 34 163 0 424 27 651 99 2268 31
14 52 18 85 39 59 128 21 333 72 512 84 2103 37
18      1976-79            437 42        243 22        84 85        37 71
4
10 27   ' 7 81      ' 6 82          16 56      35 IB         9419      340 6       497 5           181213
,. - _ _______
19
1979 80
395 11
217 38
77 08
33 55
18 15
' 12 14
' 12 84
L_
16 69
I 3515
113 47
293 95
454 03
1679 54
20
1980-01
745 0
233 5
62 71
52 0
47 75
27 57
29 73
25 56
• 40 74
38 71
412 8
633 0
2349 89
21
1981-02
540 6
315 2
19 85
7 14
35 71
19 2
19 63
13 95
34 68
1803
451 6
571 2
2209 06
22 ’
1982 83
414 6
455 6
107 4
53 96
25 9
20 13
23 4
16 88
39 8
111 5
361 4
687 0
2317 57
23
1983 84
668 2
617 6
282 5
69 26
23 01
1061
8 15
6 05
21 69
I 1347
449 2
401 2
2692 97
24
1984-05
544 46
299 55
106 21
46 24
25 02
15 73
17 69
23 0
4B 44
156 35
405 06
625 64
2314 39
25
1985-86
545 16
299 94
106 35
46 3
25 05
16 75
17 72
23 03
48 5
156 56
405 59
626 45
2317 4
Water Works Design & Supervision Enterprise
in Association with Inirrrnniinenul (■finsiilmins and Ternn^-rmc Ptt i.mT
Arjo Dertessa Bydropi. er & IrrLgai I on Project
Meieorolagical & II irologlcal Feasibility Studies
SI No           Year              Sept             Oct            Nov            Dec          Jan        Fel 26      1986 07             656 30         361 13       120 05       55 74       30 16    20 27      19B7-B0            623 96         343 29       121 72       52 99         28 67 ’  19 26      1988 09              767 6         422 32       149 74       65 19       35 27    23 1
June 2009
Apt        May         June        July          Au9
27 72 '
•-■■
58 39 '      108 6     488 34 '     754 ?6
Annual
2790 17
29      1989 90              651 3           3150         65 15
30 1990 91 669 7
31 1991 92 619 06
32      1992-93             338 1
33 1993-94 377 B
280 5         48 23
340 59       120 76
482 9         99 78
243 8 107 6
70 31
23 01
52 57
31 93     19 16 3      12
28 44     191
26 36 55 SF 179 19 464 21 717 0 2652 35
22 47 68 29 220 44 571 08 862 06 3262 93
44 03 31 91 114 4 2193 1043 0 2626 63
10 94      44 17        113 8       517 4      SST]
26 15
55 07      177 78     4G0 57     711 37
41 9 254 17 72 16 74 39 56 79 86 ' 226 9 363 1 696 7
36 17 23 32 12 45 10 62 11 34 45 3? ‘ 160 1 ' 341 3 ’ 736 3
2717 08
2631 5
2450 66
2106 12
34 1994 95 552 32 303 08 107 75
35      1995-96             291 05          93 56         36 44
36      1996 97             350 00         225 1         71 87
37      1997 98             680 44         37B 29      131 90
46 91        25 38     16 87    17 95 I 23 33       49 14 156 61         410 92       634 60        2347 64
82 8        29 25      18 44     26 36          21 96 107 7    ' 271 3     462     2     515 2
49 76        32 26    21
41    22 50          29 33 61 59      199 43   ’ 519 13'     797 75 ‘
1956 26
2300 21
58 65        26 93     19 2     20 25       25 3       55 24 j    178 06 '     465 55    715 44      2759 14 "
38      1990-99             610 23         339 31      118 36       52 61        35 59    23 62 24 91          32 36      67 95 '      220 02     572 69     880 06      2977 71
39      1999-00             750 64        417 36        145 6        64 71        29 96   ' 19 68   20   97    27 23 ’
40      2000 01             631 83          351 32      122 55       54 47        50 0      37 06   45   32 41      2001 02             546 29         300 56      106 57       46 39        25 1      16 78 17 75
41 35 j
57 19 ' 185 19 482 05 740 77
97 36 ' 291 4 ,’473 1 630 3
23 07 '     48 6         156 88     406 43     627 75
2941 57
2827 66
2322 17
42      2002-03             597 57         328 77       116 57       50 75        27 46    18 36     19 4? 25 24
53 16      171.61     444 58
43      2003 04               5331            293 3          104          45 27       24 49
I1® Total                   24434          14106       5081 7      2166 3     1135 B   75, ML AN               569 23          328 05      118.18       50.38       26 41     17 Ratio to
» | 17 32 22 52 ' 1.94 797 13 1001 4
53 10 54 23 29
47 43      ' 153 09
_ LL mi- 396 61    612 59
606 67      2540 16
21 B5 2     7011 9     18764     29070
2266 1
106515
50 82       163.07    436.36      676 24        2477 1
Mean
annual
0 23             0 13           0 05           002          0 01       0 01       0 01       0.01        0 02         0.07         0.18         0 27                1Arjo DiflHji Hydropower & IntgitlflD Pruje-ct
Mflteo rnlo^lcil £ HydiDldglcil Feasibility Studies
7.0 ESTIMATION OF FLOODS FOR UNGAUGED CATCHMENTS
June 2009
In tne tiyarofagic  analysis  tgr oams  watf&. bridges  and drainage slrudures  n must oe recognized that there are many  variable factors  that atfeci floods  Some of the factors  that need be recognized and considered on an individual site-by-site bails are
Rainfall amount ana Storm diSlnhuHOn
Carcnmem area size shape and onemalujn
a Ground cover
o Type of soil
c Slopes of terrain and sveam (Sf.
o Antecedent moisture condmon.
Storage potential \dve oanx. ponds wetlands, reservoirs, Channel' etc ) and
r
c >-and use
in general three types of estimation of flood! magnitudes (namely the Rational Memod SCS
method anc Transferring Gauged Data meinod) tan be applied for the project area These
techniques had IO be jied as per specific pnoCrem wMn respect Io Cofferdam HoOdS
AgriCultuia. command area floods and ora-nage aspects More elaborations on tnese
approaches have ofien prase med m rhe irrigation feasibility Study
7.1       RATIONAL METHOD
The Rational Method cart be applied !O smafl catchments  if they  dO nbl exceed 12 0 k.t' (CH 5 square mile; ai the moil (Gray  *971. The consequences  of applying (he Rar. gna. Method to larger MtChmams  rt Id produce an over estimare pf discharge and a cbflservafive design The method is  nevartneless  frequently  used <n StOrtdaro or modified form for much larger catcnments  Thu is  because of its  relative Simplicity  The vast majOfrly  o' tatchmenls producing floods  imposed on tne tommana druii^e system ue within me validity  of the Rational Method and ft has  been used a&lhe principal met nod of estimating oesign discharges Of dykes culverts damage channel e1c
7.2       SCS METHOD
A  reiarionship  beiwetr’  acce  mutated  ra  nfaii'  and  accjmu  ated  runoff  was  dsrwed  by  SCS  iSo- Conservator   Service)   The   SCS   runoff   equal.or.   is   Iherefcre   a   methoc   of   eSbrnfil   ng   direct runoff fmm 24-hour or 1-day storm rainfall The equanon is
Q ® (P- ia) X(IMaj + S
a
(7 1)
Where
□ = accumulated direct runoff mm
r = accumyja&ea fairmail ^pusenbai maximum i unorj mm
ia    3      inrtill    abstraction    including    surface    storage    inception    ana    infiltration    poor    to runoff mm
S ■ potential! maximum retanlion mm
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MetBorotogliiL &. Hydrological Foaslblllty Studies
June 2009
7.3
T
RANS
FERR
ING
GAUGE
D DATA
Gauged
data
may 
be
vansfe
nred   to
an
unga
uged
she
of
mier
esi
p
rovided
such
traia
are
nearby
6e
wilhin
the
ssme
hydrologic
reg
ion
ana
there
are
nc 
ma
ior
tributari
es   or
diver
sions 
Detween rhe gage ano the Site of intereSl) These procedures  mane use of toe oOngJantB Obtained jfl developing me regression equations  TF»M procedures  are adopted from me work of Adm«u 11 939; as follows
Qu = Qg
F i»
when
Ou - mean annuaroaiFy maximum flow a: ungaugad sde (m'ft,
Qg = mean annual daily FTiSKimurnftowar nearby gauged Site, m]rs I
Alx = ungauged Site caLCnmenl area f km ).
Ag = gauged sdc catchment area (km )
The   Mbm»rw   daily   <or   rh#   24   hr;   annual   maximum   flood   could   be   convened   into   a   momentary pea* as
2
3
Qp = Cf Ou
(7 3)
Here Cf is Tador estimated as Cf = 1 * <J STR .where Tc rs time of GOflfia nitration J
7.4     ESTiMATfON OF WEfGHTED AVERAGE
tn general [he Rational meUiod. SOS memcw ano Transferring Gauged DaLa are recommended for r&j'apireJy  smarl. med urn and targe catchments  reapecftVflty  However it S very  important to estacnsn a smo&ln pattern of transition from small to medium and fr&m medium to large catcnments
Accordingly cne recommenced weighted average estimate of pean Hood can te given as
Qw = W, Q, + W .O; + Wj-Qa
S
{7 4j
Where
□
;    Q;   and   Q,   are   mean   annual   momentary   peaks   estimated   by   Rational   SCS   and Transferring Gauged Data merhoas respectively
vy.   w_.   ind   W3   are   weighing   (actors   of   mean   momentary   peak   estimates   by   Aareal SCS and transferring Gauged Da La methods resoecHveiy
ano
W, = t2 S/(1
25+Al>
(7 5;
WT
(7.6}
IA« - 1 _ Ift' . iftj
■ ■ "l
-i -J ■
* —
Wh&rE- Ag and Au aro gaugeo and ungauged sue catchmem areas respectively*
7.5      SYNDER METHOD OF CONSTRUCTING SYNTHETIC HYDROGRAPH
The Synder rmeznod has been used extensively to provide a means of generating a synthetic umt ‘hyarograpn The elawralior on 1*iis imponani tool for cansiruciing synthetic unit hydjrngrapns has oaen maae in the Irrigation Feasibility already
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8,0 FLOOD FREQUENCY ANALYSIS
June 2D09
8.
1
IN
TRODUCTION
in
flo
od
Frequency 
analysis,
me
objective
is 
to
estimate
a
flood   ma
gnitude
corresponding
Eq
an
y 
req
uired    return
period
of
occurrence
T
he
resulting
r
elationship
between
magnitude
sno
return period is  referred as  the O-T reigiranjhip Return period T may  be defined as  ihe r me- interval ton tne average; tor which a particular flood having magnitude Or iaiSQ <nown as qvnatrle|i is expected to be exceeded
A  rehaoie  eslrriate  of  tne  enure  C-T  relationship  cannot  be  obtained  from  small  samples  of  at- sde   data   The   benefits   of   rationalization   in   flood   frequency   analysis   have   Deen   recognized   al least   since   ine   work   of   Dalrymple   (T960f.   Nowadays,   flu?   rationalization   approach   to   flood frequency analysis i,pamculany tn& index-flood method} is Becoming more popular
Ar- essential prerequisite for the mdex-flbQa method is tne stanoardizanon cf the Flood data from sues mln different flood magnitudes The mosl commqr pracflce used b'so in this study 
■ 5 to standardize data by division Dy ah estimate Qf the at-sne mean thus
X- = OifQm
..S D
Where   Xi   is   tne   itn   standardized   flow.   Oi   is   the   ir    annual   maximum   flow   Qm   is   the   ave'age vaiue of at-site annua, maximum flow senes
Then tne quantile CT is eswnaied as
Qr=
OmKr
1&2j
Thus  the mean annual flood ts  the indes-fload The parameters  of the distnbulron- of X are obca-ned from the comtunen sei of regional data In this  study  two distnbulions  have been jsea for flood frequency analysis These distnoulions are
ai        Genc-iaued Extreme Value iGEV) distribution Jenkinson 19651
(b.i Log-Lugisnc {LLG} distributer ;'Ahmed et a> 1968?
The resuils detained by the above two metnods are snown m tne Taele fl 1 ano S 2
respectively
8 2 CHOICE OF DISTRIBUTION
Robustness  as  cnieria has  received widespread attention for choice of distnbution- for an annual maximum *1000 iAMFj Robustness  is  assumed to test wnether a distribution anc method of parameter estimation, considered jointly  are msensmve to oepanu'es  from assumptions  maae m their use tn this  regard LlG.'PWM has  been fQuno to oe mo>e robust -1- -rr, ■ 1 -I*?' mr-p-jr; + non
Often a comoromjse nas  to be reac^ec  bclween flexibility  ana sensitivity  to outliers  Or*e maP need la compromise on some Ktnd af m>a-way  solution The compromise coulo be ro ose J tnree-parameter -distribution Such a& GEV and LlG However for th >5 purpose LLG nas  &e*rt found to be more auraclive ihar GEV
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——
June 2009
Ifl adtfJlran LLG fs IMS sensitive jeempared to GEV) Io Changes  KI ItH? smalr values  of the annual maximum Floods  Therefore ILG/PWM is better IMft GEV'PWM For modeling AM samples [iw d^play a dogieg snaps when pdqctett on probability papei
In genera i LLGi'PW'M nas  bean ipund te ba more appropriate fw mpp&ing annual maximum floods  (AMFJ  compared to nlber distributions  Therefore LLG/PWM UH Deen applied for
■sbmating design llocris required for the project
Thus    oasw    Oh    pfobabiufy    weighted    mumenls    method    and    uMQ    LUG    diistnbubgn    on    a r agionai flood frequency approach Itie return period flooos haue bear anivM at for the
proposed dam site The momAmtary P63* discharges ar exceedance,return Penoosf are Summarized beuw
various leve.s of probability oF
A" >
>
10 year return perod boon peak
29 year return penoa ftbCO pes*
50 year return perioo flood peak
575  m  '.'sec £54  rn  Vmc
771 m
IOC year return pw»d flood peak
871 m ’/sec
500 year relurn period flood peak
1155 rrt W
1000 year return period flood pea*
1303 m '/ser
1OD0O year return period flood pear. t940 ffl ’.'WC
TapJe 6 1 Esfrmared Fi'ood Quannfes ffasedon (j£V Distnbuifjn
T Kt
Mean Ma
x. najfy Ojf
Crtarge
Momenta
ry Pea
Gro^r
Wama
Wama
Return
ft
Gauging G
auging
at
Jjnciron
Dam
she
Gauging
Gauging
a!
Junction
Dam
period
■actor
Site ; 11
S.ie (2j
Site (ij
Site (2)
site
tyearaj
mtia
in* fsf
fm /s)
(m 7s)
(mVs)
OtTrtf
2
0 95
570
214
238
354
7B8
272
264
392
5
1 23
069
276
309
46C
1022
353
342
509
tn
1 42
1001
320
356
530
1176
406
395
556
zc
1 6C
H29
361
402
59?
1329
458
445
661
so
1 53
■296
414
459
666
1526
526
509
759
10c
2 0:
1422
455
505
752
1674
577
559
833
200
219
T549
495
550
B19
1622
629
609
907
500
2 43
1716
549
610
906
2020
69?
STS
1005
’OOC
201
1344
5S9
655
975
2170
749
725
1060
2000
2 79
1972
631
700
1043
2321
801
775
1155
5O0O
3 03
2143
W
761
1134
2522
87G
842
h qri ,-*n
n n-qi
1255
■■ ■ z
-
ih
+ n Hjq
n -->E
n>■
e -e
*1TJ
Average
f
707
226
25J
374
832
287
27S
474
f^Ote The analysts IS IMaedOn regiomar Okxt frequency anafyirs based on General Er frame r.ur^E' 3Fl-i diymbufiorr ^rn parameters esJrm.iren by probapifjfy n^jyiifL^j m.wmh *
Wafer Works Design & Supervision Enterprise
[a Asaeclauan wiUi Intercontinental Const liauis and TMhnHntis Pvt LuArjo Etadessi gydropgwfr & (rrtfitlon Project
M also roiogi cal HydroJ Dglcal Feaslhllirj Studies
Fapi'e 8 2 Estimated Flood Quantiles Easeaon lLG Distribution
T             Xt                Mean Max Daily Discharge
Jude 2D09
Momentary Peak
Return     Growth         Gauging       Gauging      Wama at      Dam  Gauging Gauging Warns al              Dam
period
factor
Site .1.
Site (2)
Juncfrw
site
Site (ij
Site (2j
Junction
iff#
I years,
<ra<Ei&h
(m 7s)
(rrftyr
(m /si
(m /$)
(m /5,
(m'ty
1IT> it)
irn .s
2            0 95             *72               215              238           356         7&1           273             264          394
5            1.21             854               273              304          452         1005          347             338          500
10           1 39             M2                314              349          519        1156          399            386           575
20             1 58            1118               357              397          591         1315          454             439          654
50            i as             1317              421               467           697         1550          535             517          771
100 2 i
200 2 36
1438 475 527 787 1751 604 564 871
1680 537 597 889 1977 682 662 984
500
2 79
1&7?
630
700
1043
2320
890
77*
1155
1000
116
2225
711
791
1177
2619
903
876
1303
2000
3 55
2511
803
BB1
1329
2956
1020
987
1471
5000
4 17
2947
942
1047
1559
3466
1195
1159
1726
lODflC
4 71
3328
1063
1102
1760
3915
1350
1309
194$
Wig*
1
707
226
251
374
832
2*7
27a
414
NotS.    The    analysis    ,-s   based    on    regional    flqao    frequency    analysis    based    On    i-og-Logist.c    (LLG) distribution With parameters estimated by probability rretgh!ecl moments method
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9.0 DESIGN FLOODS AND FLOOD ROUTING
9.1 SPILLWAY DESIGN FLOOD
Earlier   inUie   feasibilrty   study   for   irrigation   development,   the
spillway 
design
criteria
was   cased
on  a  lOatffl-year  return  penod  Hood  as  arrived  at  bas-ea  on
recomm
enoaiion
s  q<
section  e  IE
was deeded sc for two reasons as below
I The gam was not a large dam having a Fwgfvi of onJy 36 maters ano nad a gross 
storage of 1341 M mJ
II The dam is rocaied where failure may prouabty be confined to lhe irrigation command
and fne oam itsetf As such, no excessive *qss of human life was ani^cipaied
The flood hydrograph peak  was  1948 M m? The full oesign flood hygrograph was  convoluted oasetJ  On U' S Son Conservation Services  (SCS} recommendations  in the form of a dimensioniess nytfrograph
The lOQOO-year return period hydrograph was  routeo through the reservoir when the reservoir s  31 FRL (1356 m arnsf) Different lengths  of spillway  were assumed and the routing was 
repearec  for each spillway  length The Storage indication Methoo (Modified Pul s  Method) was aoopteo for flood routing wnicn is  a recognrzed one in the Hydrological literature The 10000’ year nao produced me out flows  and surcharges  over the FRl as  shown m tne Ta Die 9 1 for different spillway lengths
However, the justifications  pul forth (or adopting me lOOOO-year return perioc  flood hydrograph for spX’llway  may  not be applicable in the i"rr*gauon cum Hydropower scenario New the darn is oroposed to have a FRl of :37S m ams*. which wilf bring the ne«ght of the cam to 56 to 61 meiers  above 1he Riveroeci leve No more, tne dam could be cfassrfied as  a small dam The gross  storage ai ins  FRl will be 3679 M m As  per recommende-o standards  the darn sptUway  is  to be deigned for full Probabte Maximum Flood Condition iPMF« Tne criteria of 10300-year flood or flail PMF, rt adopled may  teao to higner risk  level fo the dam irrigation
command and above all to the Power House Funner when oeveiopments  ta«e peace the downstream area will invite a sudden increase in human settlements  Hence adopting such lower enters  is  unsafe m tne changed scenario of trrigation cum Hydropowef oevelopmem
Tne   PMF   is   recommended   as   such   fl   the   height   is   finarly   increase®   IO   have   FRl    at   1376
Pending the Geological and Design confirmation, the above cntefibn is  deesded If however ine above considera:ions  fix  up a rower FRl. Che design flcoa criteria is  co be again revened pack to 10 000- year Return period ciood
9 1.1 The PMF Inflow Hydrograph
°rooabie maximum flood is defined as the mosi severe flooa cons*derea feasorwbty possible
!"< ft." ■ l» ic f >              HF*ly rthii airnH hv ij-Ej; rwq           R                   □ri ng ■3—n>n»U-^ ’! -sJ.-^rwr- n** PMF fiydrograph :ho gn not aaopted for rrngauon feasic.iity a as generated m tn« course 01
u
tti'S prtsem study The generation was win a comomea approach riersnfjeid teenngj# and
ihe d S Soil Conservation services Procedures The detailed dncnpuon had peen maae
acout mese procedures .n the Irrigation feasibility Rerort In the course of ine present siuo-,
the PMF nycragrapn 1/133 reviewed n deiail for firming uprtj anape on tne oasis of the shapes of some large 1ldoa nyorographs at the gauging site downstream This exercise was tc give a
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more firm up shape to tr*e PMF design Flood Hydrograph The formed up flood hydrbgrapn It Shown in rhe Table 3 2 wnh a peak  of 3000 cumec* The A ume flf [he 1'cod hytfragopti it snown <n the Table 9 3
9.1          2 Routing Of the PMF Hydrograph through, the Reservoir
The hydragrapn was routed cnrpugn me r-eMflfW With smalt ad □ s-rme- " te n I ha sr-ap*
1
|, urthe'
The PMF Hydrograph was impinged on the reservoir When the rereryar rj al FRL 1£?6 rr
amsJj The Storage Indication Method (McnJrfied Puls Method was adcpletf ter '■□{«]
npulimg The spillway ienglns and respective-outflows and me iurcxiarg-e acore FR*. are S-nown
□n cne Table 9 4
Il js recommended io aoopr 3 spi.'lway of 125 meters long a* effective nnear watsiway 
however in case the FRl is changed to any other ieveF based on Gedegrta and Design
considerations, the enure routing studies Mill have to be revised according to mar new FRL
9.2    COFFERDAM DESIGN FLOOD
The   cofferdam   inflow   design   Hoods   Hydrographs   had   neen   generated   aready   m   the   course   Of Ine   Irrigafipn   feasihifrty   study   TtW  return   period  Hood  peaks  S3  arnved  ar  in  sect  co  9  ano  rhe d   S   Soil   Conservation   Services   recommend   a   tfan   5   were   jflmlly   usee   For   Such   gerWMOn   of return     period     flood     hydrographs    Such     Hydrographs    nag    been     developed     ever     curing     the Irrigation   feasibility   study   phase   for   W   ?0   50   and   100-yCar   rwJum   pt?iOO   JntfS   The   50-year ana   tOO-yur   return   period   Hydrographs   wore   routed   through   the   cofferdam   to   deco-   the   sate heighi of me bptferoam for the above return pwiod conditions These results are as pei&w
=3 A; Kh year Return Period Condilrah Che cofferdam nwds IO t» f>Md up tp
1335 m amsi
-> Ai 100-year Return Rer*oa Cdpotipfl me cofferdam reeds to oe raised up to
1338 m ams;
H&wever  mt  cotfercam  flood  routing  studies  wiri  not  face  any  changes  eren  if  the  FRL  ■$  firred at any level based on Geological and Des go considerations
9.3      THE CROSS DRAINAGE WORKS DESIGN FLOOD
Seven relatively large carcnmenls cross [he irrigation cOhimariG area tTpm me leh and right tank tfirecti&ns The mean tJooss generated and the um1 run off races was aisn estimated fpr thsse crossing pO'his during me rrigalion feasibility phase These require no change HQ;.
Table 9.1 Spillway Routing reaulu (ImgaTron Feasibility Phasel
Spillway LenglM
Out Flow m
Su"change acove FRL of
In rralers
Cumecs
1353 mam-sl in melers
50
3 75
10C
1069
2 07
TSO
1248
2 42
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Table £.2:          PMF Hydrograph Ordinates
Time hours    Hydrograph OftAnates
In Cumecs
Trme
hours
Hydrograph
Ordmates
Time
hours
In cumecs
June ZOOS
Hydrograph Ordinates 
in cumecs
0 00                       152 00
67 50              2024 19                  135 00                  365 31
450                      195 21
72 00              1740 69                  139.50                 339 39
9 00                      365 31
76 50              1542 24                  144 00                  311 04
13 50                     605 M
ai oo               1343 79                  ■46 50                  282 69
-boo              946 69
85 50               ’202 40                   153 00                  385 74
22 50                    1372 14
90 00               1060 29                  157 50                  254 34
27 00                    1854.09
94 50               946 89                   162 00                  243 00
31 50                    2335 85
99 00 |              828 63
36 00                   2672 05         103 50               747 63              „ j 40 50                   2903 85         108 00               662 58
45 00                   3000 00         112 50               600 88
49 50                  2932 00         117 30               520 83
54 50                  2762 DO        121 50               464 13
58 50                   2535 30         126 00               430 11
63 00                   2280 15         130 50              401 76
Table 9 J Cumulative Volume of Prooable Maximum Flood
Time Cum. Volume yjme Cum. Volume Tima Cum. Volume
(hrsjj
(Mm3)
(■•or
(hrsj
(Mm3)
(brat
(Mm3)
1%)
ooc
oooo
0 00
103 50
687 8
89 3
207 00
765 3
99 8
4 50
0 440
0 06
108 00
598 7
90 9
211 50
765 8
99 6
9 00
2936
O3B
112 59
708 3
92 2
216 00
766 l
99 7
13 50
9 389
T 22
’17 DC
716 4
93 2
220 50
766 5
99 7
18 00
21 87
2 85
121 50
723 2
94 ?
225 00
766 8
99 ff
22 50
42 15
5 48
126 00
729 1
94 9
229 50
767 1
99 8
27 00
71 51
9 3?
130 50
734 4
95 6
234 00
767 3
99 9
31 50
110 5
4
135 00
739 0
96 2
235 50
787 5
99 9
36 00
157 6
20 5
139 50
7430
96 7
243 00
767 7
99 9
40 50
2104
27 4
144 0C
746 5
97 T
247 50
767 9
99 9
45 OO
266 4
34 7
148 50
749.3
97 5
252 00
768 1
99 9
49 50
322 6
42 0
153 OC
751 7
97 8
256 50
768 2
TOGO
54 00
376 4
49 0
157 50
753 6
98 1
261 QD
768 3
1009
sq qn
4^6 4
fiq q
iq? nn
5
OP ?
d
63 00
471 S
63 4
166 50
757 2
98 5
370 00
768 5
67 50
5U 8
66 6
17100
758 6
96 7
274 50
768 5
100 0
72 00
546 4
7T ?
175 50
759 9
98 9
76 50
576 0
750
180 00
75t6
99 0
81 00
601 7
78 3
’84 50
762 0
99 2
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Time
(hrs)
Cum. Volume
(Mm3}
Cum. Volume        Time
(Mm3)       (%)
fhfS)
June 2009
Cum Volume
1  —r— -------------------------
(Mm3)        (%)
' 65 50
6239
812
169 00    7629
99 3
go oo
643 4
83 7
193 50    763 6
994
34 50
560 4
190 00    764 3
39 4
99 00
675 1
87 9
202 50    764 8
99 5
Tabie 9.4 Results of RnArwir Rolling (For Irrigation cum Hyanopower Slagel
SprfJway Lengfn m     Out F>ow in     Surcfiarge aMve FRL
meters
cumecs            1376 maim El in meters
i 60
716
3 SO
' 100
936                              2 76
125
1100
2 50
150
1165
2 30
175
1214
2 15
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10 0 SEDfMENTATfON AND WATER QUALITY
10.1 ESTIMATION OF SEDIMENT YIELD
Junt epos
in the Fflasibildv stuay for ifrtgalion projfril suspenoeo wdfcnenl Gaia from StlUCKi; 14QQ1
14014  and  14GQ5  were  obtamec  Suspended  COrnMntkHl  nln  varying  betwMfl  45  mj  it.: 167Q mgli wn ntawvnd from DeGessa fiver
^etationsnips  oerween wafer discharge end Hdfeiwnf kwtl it Vinous  UtM in IM regien 8-e presented in Title + 0 1 AVUte and regrana apotoacn had DWTl used Eo SSWnai# MdUmern raws from 1he estimaled stream flows fff the dam site Accord ngiy the lolloping re aricnsnip hac Deen derived
Gs = 0 07fiQlS
(10 1)
Whwt
Gs = sedimni ioad (in gm)
Q ■ niQinFtfily mean discharge (in It'S/knT.
Careful assessment regarding reservoir setfjmeniaUon wifi be required in me sle as me life of She storage crea led Dy  a dam is  dependant of she sedimentation srtuation Accofdmgly reservoir planning wii; mciude assessment d tne probabe rate of secf-imentawn in sraer to predict the useful life of ine propose-o reservoir
in estimating rese-^oir sedimeniarjon marenais originating as neo ioad were assumed to nave a densely of 1 4 gntfcc ano material earned m suspension assumed to have a oensny ot ’.2
gm/cc The bed load al the dam sires was assumed to de 15 percent of the suspendeo ioaa Monthly tota^ sediment road (suspended eno ped load) and accumulated lotai sedrmant soaa ai tne reservoir site is given by Taoe 10 2 and 13 3 respectively The reservor eieMauon area capacity relationships are shown m she Table 10 4 The same -s depicted pict&naiiy m Figure W1
io 2 distribution of sediment in the reservoir
So tar tne sediment ioad hAeiy co deposit in me reservoir has been estimated But estimating me sediment inflow to tne reservoir is not enough as how n.gn me sedrmenl will accumulate in the reservoir also Important. Accordingly Area-incramsnc imemod had Deen used for this purpose The method is expressed as
(liG 2i
Where
Vs = Ao(H - Hoj r Vo
Vo b ged^ent bsrow me new jero enavanon
H » origin^! reservoir depth from me stream bed level
_ heignt 10 which lhe reserves is completely filled wnh seoimem i e height of me new zero Olevalior
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The resuiis  so oblam&d from the analyse of j.5ui&uli<jn of sedrmeni in the Aqo-Dodessa Rosbiyow are given in Table 10 5 however the sediment is founts to have no interference wnh the operation ot the reservoir
TO.3 A ATER QUALITY
The  water  quality  siatus  of  (ha  Oeoessa  Hirer  it  evaluated  using  che  t?aia  collected  from MoWR  daiaoase  Abt  By  Riw  Ba^m  Master  Plan  Study  Reoon  (l«9ty  The  samDies  were latten as part ot irte supporting measurement for Ebe aquatic Study and appear to represent tne only  available  data  on  water  quality  wimm  tne  catchment  Ta  bit  10  6  shows  wafer  quality measurements ta^en for  Dedessa at two sues  Tne  samples snown m Taoie iDB  were  Laken after the start ot the rainy season ana presumably ah trrbuLioas fll tne fflrflf axniblttld MequVtV water quality at tne time of sampling
Total Dissolved Sonos |TDS| and EVkIHcII Conductivity (EC)
Toiai d 5 solved solsds charactered mainly oy major anidns and canons are directly reiarea tc the ewctncal conductivity of ifte water “he low Electncai Conqucttuity (EC J and ""DS value m general shows that the waler is soft in nature and has low salinity Moreover me Mw
ctinduffivUy is sign or l&wfertiMy of me water with regard io aquatic hfe Electrical conductivity 
:ECj measurements were very tOw aL all me sampreo sites EC i$ me aiiifrty of me water to concuct electnc current and directly related 1o IFM amount of cations anp amofis m the wate
PH
The pi-i value is me measure cf me GoncarWaUqn of hydrogen (H+. and hydroxyl OlH-j ions io the water it d to determine the acimty ex alkaJmriy of the substance
So Ji u m and Poia ss i u m
The Na" and K" reacting expressed tfl terms of Sodium Adsorption Rano (SAR) B 'he usetui parameter for tne equation of me water body  for irrigation purpose for irrigation water ■! if important rq measure rhe SOOium SOSOrption ratio as fflfiows
SaR *        Na'
l n 1}
llOT* Mg-JJ]”
The higher the SAR value of the water the less suitable wiH be for ungaiion purposes The maximum computed value among ine readings is 0 29 which are less man |0 Th-* illusracts mat ihe water is very much suitable for irrigatiOh purpose ana Hydropower generai'bft purposes
Chloride
Th*
^"■nnpnlr^h'in FI< Bha
vnn
llflh ? ft
Jimoc
Hence "he parameter was m conromfiiiy wilh ine ssanaarq sei by EPA i.25unig i ror aquax specie^
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No
Station
Area
firm1]
Module
10’try r
Loss
Vkm /y
4
Vales of C in
Qs =C(Qw)’ *
M05      □ ude.r an Guder                                                                   524          77            90        0 025
4007     Little Angar near Gutin                                  1970        176            69        0 096
4005     □a than 3 near Acasma                                2801         453           157         0 059
4002 Anagar near Meqemte
6002 Abeay at Susan Border
4674 702 150 0 06T
1722M 335170 1946 O 165
Ar/o Decrease OaZrf JUS                                  5278        778            f47        0 078
Taor'e iff 2
Tctai SecfrmenJ Loaa ar ffle fltservw
TOTO rnJ>
Jan Feb* March April May June July Aug Sep Oct Nov Dec Annual
Avg
Stcftfev
Ci/
Sfcew
2 48 1 33
1 71 1 01
3 63 4 01
7 36 6 29
f
14
I  II
T 77 4 51
T 72 4 2
5 15   5 3?  4 91
?JT I 240 5 2 FT 5 02 72 90 T9 92 6
2 526 2 006 2 3TI
7 54  ri ■?
27 2
176
3 42
748
120 7
99 01
4 349
0 03
3 596 0 670 3 SOT  7 051
?9 29 5 57 14 7 4 95
J 024 3 0 70 92 0 77
775.6
304.5
2.07
<57
Tabfe TO 3 Accumulated Fatej Sed/menf ^wa ar ffre Reservoir Srte |rtl VrriJ,i
Years  Jan   Feb March       April   May     June          July    Aug    Sep      Oct    Nov    Dec   Annual
25     0 06 0 03     0 03      0 04    0 11      Q6S      3.20    6 2     5 29    300    0 46   0 1"     19.39
50     3 12 0 07    0 OB     0 09    0.23       1 36       6.6    12 4     106     6 0     096   0 34    38.78
75     0 19  0 10    0 OS     0 13    Q 34      2 04        95     186     15 g     9 0    1 45   0 52    58 17
100    0 25 0 13     0.11      0 17    0 45       2 72      13 1    24 3    21 1    12 0   1 93   0 69    77 58
12S    031  0 17     0 t4      0 21    D 56      3 40      16 4   31 1    26 4    15 0  2 41   0 06    98.95
150    037  0 20    0 17      0 26    0 60       408      19 7   37 3    31 7    ISO     ?69   1 03    116.3 ITS    0<3   3 23    0 20      0 30    0 79      4 76      22 9   43 5    37 0   21 0   3 38   1 20    135.7 200    0 50 0 27    0 23      0 34    0 90      5 44      26 2    ^9 ”     42 3    24 0   3 86   t 37     155 1
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Table 1Q.4: EioaliOn-Area-Capacily Relationship at AqcDedessa irrigation cum Power Reservoir
E t&vettan
tm ast)
Area           Volume
(m
Volume
(Mm1/
1320
0 64
D0
1356
87 85
1341 2
1321
0 99
08
1357
90 75
1430 5
1322
2.39
25
1358
94 18
1522 9
1323
3 78
55
1359
97 23
16166
1324
5 11
100
1360
100 54
1717-5
1325
664
159
1361
103 64
1819 6
1326
8 03
232
1382
106 39
1924 6
1327
9 46
31 9
1363
109 00
2032 3
1328
10 67
42 1
1364
111 91
2142 8
1329
12.67
53 9
1365
115 05
2256 3
1330
14 40
67 4
1366
117 68
2372 6
1331
15 89
82 5
1367
120 20
2491 e
1332
17 74
99 4
1368
122 76
26130
1333
19 46
1100
1369
125 28
2737 1
1334
23 59
139 5
1370
127 69
2863 5
1335
26 66
164 6
1371
130 25
2992 5
1336
29 05
192 5
1372
133 03
3124 2
1337
31 73
222 9
1373
135 45
3258 4
1338
34 24
255 8
1374
138 08
3395 2
1339
36 62
291 3
1375
142 38
3535 4
1340
39 45
329 3
1376
'45 27
3679 2
1341
41 97
370 0
1377
146 00
3825 8
1342
44 25
413 i
1376
150 75
3975 2
1343
47 05
450 8
1379
153 73
4127 5
1344
49 05
507 3
1380
156 02
4202 3
1345
53 11
558 8
1301
159 09
4439 9
1346
56.31
6135
1382
162 13
460C 5
1347
59 15
67T 2
1383
166 96
4765 0
1348
61 56
738 8
1 384
173 01
4935 0
1349
63 97
908 7
1365
178 58
5110 8
1350
67 88
874 7
1386
163 38
5291 8
1351
70 62
943 9
1387
168 10
5477 5
1352
74 35
10164
1388
193 28
5666 2
1353
77 60
i ■•■■■»
1092 5
“--3
■J -   b
1389
197 36
5863 6
’770
?*
Ml  - --j
1355
84 51
1255 0
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_ _________ Junr?m_______________________
Tat le 10 5 Doll 'UHon df Sediment *n the Arjo DfidMSO R esei von (Area Ina emeu! MethOdl
50 years segment Mad
IM years segment toad
Ho = 2 03 m
Mo ■ 3 42 m
Ao=T52Mn?
|________ __________ A0-J.7SMmJ
Etev
fm
#sM
i
Ofigina!
are*
(Mm*)
2
CbrgiNiaf
c pJGfty    Depth (mJ
Secriment
VOlUITTV
fMmJJ
ff^i/rsed
jrea
(Mm*)
6
Rewsed
capKtty          fl»v
(m ast)
O/rgrnaJ
ji'ea
fMm1?
2
Origmaf
capac/fy Depth
(mJ
volume
(Mm*)
ftemed
area
(Mm J
3
Revved
capacity
(Mtn )
1
3
45
71
345
B7
1246 56 76 29 8 27 38 7 55 24 591 1 1346 56 76 629 8 27 77 4 53 61 552 4
1343 40 13 166 4 24 34 2 46 61 432 2 1343 48 13 466 4 24 60 44 98 398 4
1340     39 92         31 a        21           29 6          30 41         302 2         1340      39 92       331 a         21           58 6          36 78          273 3
1337     32 17        224          IB           25 1          30 66          198 9        1337      3? 17         224          18           49 1          29 03          174 6
1334     24 93        1407        15           20 5          23 41          120 2        1334      24 93        1407         15           39 7          21 70           101
1331 1&24 ,9 64 12 16 16 72 63 67
1328 12 19 3 24 9 114 10 68 26 fl2
1331 18 24 79 64 12 30 2 15 09 49 4
1328 12 19 33 24 9 20 B 9 046 17 44
1325     6911         13 6          6            6 83          5 395         6 724         1325      6 911         136           6            11 4          3 765          2 239
2 619          32?         3            2 33
132?       2619        2 322          3            1 92
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Taele 10 & Water qu&my results for sues on the Detfnie ever
at Bedele             it Gimfci
June 2009
Sampling
bridge
bridge
Comment
Sample dace
Elevation Im «D
13/08/96
1300
14/08/96
1200
TDS (gmflj
20
20
N
EC ( 5/cm.i
60
»
N
pH
674
S9?
N
N3l+
3.3
30
N
«r
19
25
N
Ci" (mg/J)
fl 4
M
N
Mg'  (mgfl)
+
2 43
14
N
Cl (mg/lj
10
20
N
SAR
0.29
0.25
N
Figure 10.1 (Original Eievation-Area*Capacity Curve/
Clrwabon-ArM-CapicrtY CufW to* *V|O O«»M NlWfVfl*
AfVBlSq fLcei
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110 RESERVOIR SIMULATION CARRIED OUT FOR IRRIGATION FEASIBILITY
June 2009
Elaborate  simulations  nad  seen  earned  oui  during  the  irrigation  teas  bdrty  study  The  various teputs in the simulation model are as beldw
*    histancan monttily flaws Time Senes of 44 years
•    Synthetically generated monthly flows Time Senes of 1000 years generated by AR t
model
*    Appropriate monthly Irrigation Requirements (Vide Table 111}
■   Evaporation ano seepage losses
■   Downstream mandatory releases for environmental stipulations
•    Revised eievatiD-n-arEa-capacsty curve of trie reservoir expected after 50 years of
operation
A pfflofra tailor made mode- was developed m JtfIS E^cei base With the central levels of 1350
rnamsl  and  1356  mamsl  as  Minimum  Draw  Down  and  Full  reservoir  revels  the  simulation  funs Es^aohshed aoout 90 % success of the contemplated irrigation
M0wevHj  dun ng the present feasibility for Imgatron cum Hydropower generation a -r-sw set off Simulation mooEis are required to be processed 'or tee changed Scenario
Table 11 1: Irrigation Water Requirements for Various Scenarios
(Mcum)
Phase 1
Phaseu
Monin
R011
Rot2
Roll
Rot2
Sep
8 38
8.43
12 43
12 45
Oct
1C 41
W66
13 T9
13 72
Hov
2 89
2 90
3 16
3 29
Dec
IT 04
12.49
14 02
16 07
jan
is 00
22 15
24 64
2B61
Fee
23 25
27 87
29 98
34 92
Mar
18 49
22 15
22 99
26 41
Apr
4 9E
5 21
5 09
5 30
May
201
2 01
2 01
2 01
Jun
21 64
21 64
32 42
32.42
Jul
5$7
5 97
8 95
B 95
Aug
6 89
6 85
10 33
10 33
Total
134 93
148.43
179 22
194.49
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12.0 MODELING FOR IRRIGATION CUM HYDROPOWER GENERATION
12.1 EVOLUTION
As  discussed in the InUoductidn. on the esiapLshment qf Irrigation Feasrbhly  i1 was  Uetidfed to go fdr Hydropower generanon along wiin Irrigation development because tut avji'eDiiily  O1 consioeraDie water resources  and a ravoraole typography  to explore ine proposa tor a a am with considers  bia hgner heights  As  such a Pre-fessibitity  level Study  was  ta^en up and completed ir. February 2008
The modeling for ine combined development tit irngaUcn and hydropower was  different m IHrS case irom convenlronai projects  It rhe project had a smgie purpose of either Irrigation deveJOpmeht or hydropower development, obviously  tne modeling would tie srratghtfdrward In such cases, some of the appropriate models  from hydroiopjcai literature town be used Even in cbse of twin co,aciive projects, the problem o&comes  simple irthe irrigation refuses  pass innpugr the power turcines. in which case me irrigation releases  are advantageous^ uMizeo tor power generation
3ui m the prawnt srtkritnn of tne proposed Ajjp Dedessa me mooting becomes  not sc Straightforward The rngatior HdSlSH neea Co be maSe on fir^t pnonly  31 the same nme i can ro’ be passed Inrough the lurumes  ■* the imcation command is sdualec much above Che River bed level because of lopographic  consi’aints  a$ sucn. iwq gets  of separate out lets  fere to be MlatHnhed one Dedicated far irrigation and ine Other for hydropower releases  This Situation m a way  conslra.ns  the hydropower generahon as  it nas  to sacrifice the irrigation releases  For sucn a siluaHon readily  available simulation models  in lhe hydrclpgicai literature may nol be a die to cope jp i-lcwever ChE Consonants with hCb experience in ha-noling such sitLabons Dy sininaiiQn developed a laiEor made simulation model
12 2 SIMULATIONS FOR OPTIMAL POWER GENERATION
The simulations  runs  were oarr-ed out with 1he -rnganon feasibility  FRl of >356 m amsi This ndicaiea That With th* aPOve contemplated FRL, the irrigation development was successful ai
50% reliability Ifevfef iol only so such development was successful even m Stnngenl years like $0% and 95% ol exceedance orobabilily  levets  Hence no ambiguity  was  coming forth with respect to Success  ot lmgation development Over an area of acout 17 006 nectares  However wdh respect to Ide Hydropower genera;ipn after fully  satisfying irrigation could go up la pnly about 5 5 MW Hence il was  needed thfet to Obtam a reasonably  higher power if becomes necessary «o try Full reservdir levflis ai higher zones above 1370 m &msl
At  the  end  of  the  Feasibil'Ly  study  for  the  Irrigation  Profeci  such  a  conclusion  wn  arrived  at Tne Tai water .evei was at 1322 m imsl m the above simulations
12 3 POWER EXPLORATIONS AT HIGHER LEVELS
Subsequently  at the and or tne Feasibility  study  for imganort me sm>u anon mo®?! was Sl.gmiy mod tied racodUd and compiled to Citer TO Simulation runs for hignervaiseo eve 5 and to various  aallerns  at power neteHfel For tne saxe of hyoropowfir notertia auesitiofem a urge number pf anemMrva tuns  Of the model were exercised In 3 different domains  These are
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* Domain 1: Keeping the power oullet at a -ewer level of 1346 meters and increasing the FRl in stages with combination or release patterns. This is with a wew 10 utilize the water stores m me reservoir above me actually required M0DL of 1345 meters and rhe Irrigation MDDL or 135G meters That j& Ine idle water wi(n respect to Irrigation sioreo between 1346 melers and 1350 mecers COuW a.so be used for power generation
■ Chomain 2: Keeping1  the power ouiiet ai the idwer revel of 1346 meters as aoove ana increasing  the  FRL  m  stages  but  with  model  inouill  decision  support  based  power releases
» Domain 3: Keeping^ me puwer outfac al the same level os mai of the irrigation outlet (1350  melers)  and  increasing  the  FRL  ifl  stages  with  model  inbuilt  daemon  suppon based power releases
o In ibe Domam 1 case a set oi 12 different simulation rvms was attempted wiihin the FRl range of T37C melers to 1300 melers
in the Oomao 2. (here were l O Different simuration runs
in lhe Domain 3 there were S runs of the simulation. The results are as below
Powec at 97%
Domain
Na
Domain Nomenclature
FRL
»xH«din« i»ve«
[Firm Fawcrf
1                    MDDL at a lower ieva< of 1346m              1370m                    n 22MW
and assumed patlerr of monthly releases
2                 WOOL ai lower ia>ei of
1372 m                  13 30MVV
t374m
put 1372m
13 62MW
16 49MW
releases based on decision support
1374 m
1376m
17 20MW
17 90MW
1373FD
19 50MW
3
WDDl far power ai same level at
1370m
17D0MfV
1350m as irngalipn outlet i wiin
1372m
18 10MW
■eparaie cuiwts) Deciskjr support
1374m
16 95MW
based releases
1376m
ZO OOMW
Thus at a FRL of 1376 melers the firn power generation goes up to 23 DC MIA1 There was 
also an sndi ration that above l'3?6 meters Che reservoir is not opening up to accommodate
higher incremental volume per unit raise rn the FRl As sucn. me increase in FRl further may 
not oe producing power commensurate wv|n me tdst element Further even after raising me FRl trp IO 1382 meters the surplus m very goon years could noi be fully arrested and the Mybffltogy  becomes  a (wirM above FRL of 1376 mamsd As  such at mis  level *1 >5 found
■Ui > >c             j.l , L .iLi.= i3 Seems i.0 Ut" u'ji.m'-'ji rd SdCr., rtyOl
"!1kj- _ -j _ _l
Ifie :j.jm FRL |fl 137-3 m amsi and gflWration of aiwirt 20 MW firm power round |lw yew .9" % Exceedance proftaWMy leverj which wun a piant (actor d 0 0 may result at the installed capacity if 33 MW This emagtng picture isu( warw after sansfyng irnganon Almost al 100’ reihSbdity
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However even for raisrng up 1o this  level lhe GeologicaMGeo-techmcai support needs  to be established Since me detailed geological investigations  are to be completes  some geoiogca
□r design constraints may crop up to raise the FRL to 1376 m am si At this time me Taif tArater level was sl 1322 m amsJ
Then during the Pre^Feasibihly  Study  me simulations  were rerun because pt change in the Tail Water tevei from 1322 mamsi to 1317 mamsi The simulations  were rerun again for the FRL of 137£ mgms, Because of towering of tne Tail Waler level me Firm power increased tc aoout 23 75 MW fur the Domain 3 conditions whicn is optimal
During tne present Feasibility Stuay with jpCsung of the inflows me simulations were rerun tor vanous FRL conditions The Tail water lever was at >3*7 m amsl and the minimum operal-ng pool was  at 1350 m ams* Considering the aspects  other man nyaroiogy  ano (or facing aifferent constraints  and possible reductions  in FRL from 1376 m amsl. a son Qi Firm up Simulations  were carried out by  an Ms  Excel based model for a spectrum oi FRL The Simulations were carrteo out for FRLs at 1356 1358 136G 1352 1364 1366 1368 ano 1370 This is co aio the Design group to come out wrth an appropriate FRl cased on me constraints Other than riyaroiogy  The FRLs. tne Firm Power me possible insiariea capacity  a" a piant factor of Q6 are presented m me Tat*e 12 l m all me cases the Minimum operating pool is well above 1350 m amsl
The input nydroiogicai time senes  up aaieo during mis  study  is  given in the Tatrte 5.7 The Simulation starts at the end of the fair weather season in September The start:ng level as Such Ji xepl at FRL 1376 meters  The irrigation developments  requirements  had already  Deer precisely estimated in me course of me Feasibility stuay for irrigation development tor inputting
n the simulation The reservoir live storage has deed segmented into 6 different zones At any stage depending upon me starting zone ol the reservoir the power release ruto was inbuilt in the modei The tan waler leve' w as kepi around 1317 meters Or firming up tne exact height cl rne dam the tail water rating will be firmed up using software Mec Ras" of the US Army Corps Of Engineers
Subsequent’y  in tne course of mis  present Feasibility  study  the design considerations warrantee revising me Simiu-atiOhs with minimum operating pool at 1353 m amsi insteao of al
’ 353 m amsi This was again earned out for the FRl 1376 m amsi wild minimum operating pooi at 1353 m amsl This marginally increases the firm power co 23 75 to 23 &0 MW As a sample 2 -yea’s simulation out puts are shown in the Tac*e 12 2
In me Annesure volume at B-7 tne entire <4-year simulation abstracts  are provided At the eno ot mis  present Feasibility  and just after finalizing this  report lhe Design cansioeraiions warrantee to rerun the simulations with tne Minimum operating pool at 1346 40 m gmsi which i$ unaef progress The<e is an indication that because 01 th^s there is not any change in the P.rm power at higher FRL eondihons ana tnai there COu»d be mamma increase m ipwe^ FRl ranges nowewer a aetdiied final simulation is pianrvea m Uie □^taneu stuuT whe mt
and Design Groups 3 unique decision aoout tne FRl
12 4 INFERENCES
By the foregoing discussions rt is found th»1 with lOentilved optimal FRL 13"6 meters and me MDDl at 1353 meters tne Irrigation deveiapmen: contemplated is completely successful ano
Water Works Design & Supervision Enterprise
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M-eie^roltfgleaS & Hydrological Feasibility Studies
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m addition gene alion of
r
ujntmygus Hydropower of 23 90 MW as firm power 11 also possible
However, far ladng some constraints  other man Hycrrpiggy  itie firm power generated at various levels iFRLsj from 1356 to 1374 15 at» established snd provided in the Table 12 1 (for Minimum operating poor at 1350 m gmslj However depending upon Geomgica- Ir.ueitigatLgn results  and consequent changes  m hergnt dr the cam a ng 1ne ocauon or minimum operating dckji. the simulations are 10 be fumed up The simulation cot puis sno#n in tne Anrwxm B-7 and Table 12.2 are far minimum operating poor at 1353 m a ms.
Table 12.1: Firm Power at Various FRL conditions (1350 m amsi Minimum operating
pool I
FRL ismamslj Possible Firm
Power (MW)
1356
5 97
Possible installed Capacity by adopting
0 60 as Plant Factor (MW)
99S
1356
7 75
12 90
1360
10 75
17 90
1362
13 25
22 06
1364
14 09
24 4B
1366
1369
16 47
17 94
1370                          T9 76
32 oa
1372                          20 95
34 91
1374
1376
22 05
23 75
27 45
29 90
Jfi 70
40.00
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ul
Ln AsExlauan Willi InimoatlncnKI Cnnsuiraou ano Teetinoerau Fvi UflArjo Ordessi Hydros wtf 4> irngicioa Project MeleorolDglcnl i I drflloffiral Feisiblllly Sludlcs Table 12 2 FRL t 1 J7S m amsl Firm Puwei Generation
June 2009
FH| at 1376 mama I
1 irm Power Gen«iBhon
1353
mamul minimum
□periling
?eai and
Slarlmg
InIto*
Storage 1
Irriga’iCO
Slot age 2
ReSfrMQir
Pnoer
SLarage 3
Mean
Hfr»d
pool
Power
Energy
Surplus
End
Manin
Storage
leqmrefnvfi
t
7onr
release
level
Mrum
Mtipn
Mpum
Mtuffl
Mrum
M< urn
Mr urn
m
m
GWFir
Mcum
Storage M-cum
1961 6?
2?(9
900
3609
17
3677
Suipfl
142
3535
1376
59
73 76
17 13
746
27S9
SEP
1961-62 Orl
278*
£61
2450
14
3*3*
ILifptl
142
32M
1376
59
23 79
17 13
505
2709
1961 62
2781
297
3W1
3
307B
tuipls
142
2936
1376
59
23 79
17 13
147
2?tt>
Nqu
1561 62
278*
101
7090
16
26 74
lyfplus
14?
2732
1376
59
23 79
17 13
0
2732
Dec
1961-67 Jan
27J2
35
2767
29
7738
7
140
2590
1374
57
23 96
17 25
0
2500
1961 62
259C
19
2609
35
2574
2
148
2425
1374
57
23 96
17 25
0
2426
Feb
1961 67
242*
19
7445
76
2419
2
I4B
2271
1374
57
23 96
17 25
0
2271
MH
■901 62 Apr
7271
5
2276
5
2271
7
146
2123
1374
57
21 96
17 25
1961 62
212:
0
25
2144
2123
2
2142
3
159
1983
1370
53
23 93
17 23
0
M>r
mi
1961 62 Jun
1W
157
2140
32
210B
3
159
1949
1370
1W1 tlj jul
194>
398
S3
23 93
17 23
2347
9
233ft
0
1049
3
159
2179
1370
1961 67
53
2393
17 23
2V
W1
2740
10
0
2179
2730
3
159
2571
1370
53
Aug
Mean
2.193
17 23
0
2571
?4J
149 7
56 33
23 69
206$
1398
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Table 12 2 Confcl
Year and Sr. nng Inflow Storage 1 Irrigation Storage 2 Reservoir Power Storage 3 Mean Head Power Energy Surplus Fnd
Month
SI
,bge
M mu Mt. urn Me dm
requirement
Mcum Mu
Zone
jrrt
i elease
Mt urn Meum
Level
m m MW GVVhr Mcum
Storage Mcum
1967 63 Sep
?57l
900
3471
l?
3459
2
140
3311    1374
57      23 96       1725
1962 63 Oct
2789
512
330 J
14
3287
l
142
3145    1376
59     23 79      17 13
1962 63 Nov
2789
65
2854
3
2851
1
142
2709   1376
59     23 79      17 13
1962 63 Dec
2?09
32
2741
Ifi
2725
2
140
2577   1374
57     23 96      17 25
1962-63 Jan
2577
23
2600
29
2571
2
140
7423   1374
57     23 96      17 25
1962 63 Feb
2423
12
7435
35
7400
2
140
2252   1374
57       23%      17 25
1962 63 Mar
225?
1?
2264
26
2238
3
159
2079   1370
1962-63 Apr
2079
53     23 93      17 23
3t
2110
5
2105
3
159
1946   1370
53     23 93       17?3
1962 63 May
1946
112
2058
2
2056
3
159
1897   1370
53     23 93      17 23
1962 63 Jun
1697
735
2132
32
2100
3
159
1941    1370
1962 63 Jul
430
2371
9
53     23 93      17 23
1941
2362
3
159
2203    1370
1962 63 Aug
2203
826
3029
53     23 93      17 23
10
3019
522            2789 356            2789
O            2709
0            2577 0            2423 0            2252 0            2079 0            1946
0            1397
0            1941
0            2203
3
159
2346
2860   1370
Mean
53     23 93      17 23
152 5
55 33     23 92      206 7
71
949
2789
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rological Feasibility Studies
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13.0 REDUCTION
OF FLOWS IN DEDESSA SUB 8ASIN
tn  all  tie  cases  of  si
mulation  runs,  (here  is  no  detrimental  effect
on
the
downstream  fl
ows  of
Dedes  as  sub  basin
The  maximum  consumptive  jfchzation  is  only
lor
ir
rigation  which
is  only 
3
l94 49Mm annually 
as   the   additional   releases   made   for   power
are
n
ot   consumptive
uses 
The power releases  go back  to River Oedessa just in the downstream Thus, a net reouotion rn tne sub basin flows  wilt be up to a quantum of 195 MmJ even wiihout accounting for any irrigation regenerated flows  The sub basin of Dedessa contributes  at its  end annually  to Abbay  a quantum of l4.C33Mm’ i.BCEOM Master Plan Study) This  will get reduced to ll.638MmJ because of me proposed Arp Dwessa project, which is  only  a neghgib'e reduction of 1 39% As  such, the Arjo Dedessa Dam proposal is  not going to jeopardize the overalt developments of the suo basin considering various identified projects of the sub oasm
14.0 MANDATORY DOWNSTREAM RELEASES
Mandatory  dcwnsiream releases  are to t-e made from the dam for ecoiogicai and Environmental angles  This  a continuous  oiscnacge of 2.5 cumecs  based on low flows  time Series  analysis  Stnce this  a Hydropower dam the releases  at any  lime will be more than in-5 minimum requirement As sucn the mandaiory minimum releases are more than assured
15,0 RECOMMENDATIONS
i  Once  i  he  dam  is  ope  ration  at  in  addilK>n  lo  ilS  own  contemplated  development.  n  will spread  its  positive  impacts  an  me  downstream  with  regulated  power  releases  That  is  me downstream    area    is    going    to    enjoy    tne    regulated    releases    The    present    somewhat unfavorable   Hydrology   of   tne   downsiream   areas   wifi   become   a   hydrology   with   posurve impacts  The  situation  will  become  like  the  TK95  dam  and  the  Humera  irrigation  prajeci  in the  Tekeze  basin  As  such,  immediately  a  suitable  irngairon  prOftci  needs  to  be  ^nentifiea in   the   downstream   far   availing   tne   opportunity   of   utilizing   the   regulatw   releases   of hydropower   from   Arp   Dedessa   aam   In   the   downstream   a   sirnpie   oarrage   or   weir   or   a small   dam.   which   wi2l   produce   the   benefits   equivalent   to   a   big   oam   coubd   divert   ihe waters
II    H    is    very    heartening    development    that    the    water    resources    exploitation    for    optimal utilization  towards  economic  stability  is  getting  the  major  thrust  in  Ethiopia  With  phase  of achvilies   soon   the   rich   river   basins   will   be   impounded   in   different   storages   associated with   a   number   of   runoff   tne   nver   schemes   either   for   irrigation   or   power   or   m   a   mu-ii objective   sense   As   sucn.   tn   the   present   scenario,   the   hydrological   piannmg   ano   design fire   in   the   usage   However   when   the   basrns   m   tne   near   future   become   sluffed   witu
l j ii-IjU La ii.h' Ji I L i. “ I tS l3 I i II a p jj- ..■■aji ' ' - ii "Oil 0 p ■asj w !H <
:i
—
judicial operation of a mull! reservoir /project system has  a ujt of benefits  m camcaiing floods  tiding over drought. reduction m water tosses  and others  However such real time operation wouia requite a complete knowledge (in tne r.ydroiogica sense, o* tne basin system and hydra logy ana simulation techniques (Simulation coupled wsfn optimization
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models)   Such   a   scenario   of   real   time   operation   will   have   Id   be   backed   up   by   Hood forecasting    networks    advance    prediction    of    seasonal    rainfall    adequate    telemetry    (for transfer   of   data)   dedicated   computers,   telecommunication   soft   ware   in   addition   to   subject mailer   (hyoroiogy/simulatron)   software   The   personnel   heading   soon   operations   m   a   basin ana  those  working  m  such  a  team  need  to  be  trained  m  the  above  mentioned  aspect  so as   lo   undertake   operation   which   has   immerse   advantages   Hence.   H   i$   recommended that   experts   on   Hydrology   and   Hydrological   modeling   should   be   idenhfiec   for   undergoing sutn   trainings   in   Instnutions/uruversities   m   appropriate   countries   Though   there   could   oe many    such    mstilutes    me    consultant    feels    for    such    multi    system    operation    adequate expertise    is    available    in    countries    like    USA    and    India    where    many    institutions Universities.   River   basm   authorities,   and   research   stations   court   oe   identified-   for   offering such   trainings.   Such   trained   personnel   with   expertise   m   hydrology   will   be   aoJe   to   head future river basin authorities for optimal real time operation of the systems
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REFERENCES
Aamasu Gebeyehu. 1998 Regional Analysis on Some Aspects o< Siream flow Characteristics m Ethiopia (Unpublished Draft Report) August 1986.
Admasu Gebeyehu 1909 Regional Itaod Frequency Analysis PhD thesis Royal Institute of Technqiggy. Bulletin No TRlTA-VBI- 14B Slockhplm Sweden
BCEOM 1999 Aobay River Bam integrated Development Master Plan Project Phase 2 Data Collection, Site investigation Survey and Analysis Section II. Sectoral Studies Volume III Water Resources Pert I - Climatology and Pan IF - Hydrology BCEOM - French Engineering Consultants - in association with ISl and BRGM
ERA (Ethiopian Roads Authority}, 2002 Drainage Design Manual Hydrology
Fiddes 0 1977 Flood estimation far small East African rural catchments. Proceeding institution of Civil Engineers, Part 2. 63, 21 -34 (1977)
Gray. D M Editor in Chief 1971 Handbook on toe Principles of Hydrology
naan CT t977 Statistical Methods in Hyoro.ogy The Iowa State Umversrty Press Ames nersfield 0 M 1961 Estimating the probable maximum precipitation ASCE J Hyo Div 87
No Hy 5 99-116
Malaias NC 1963 Probability Distribution of low Flows Statistical Studies m Hydroiog?
Geoi. Survey Prof Paper 434-A
Shaw Ehzaoeth M 1988 Hydrology in Practice intemanonal Van Nostrand Remhbid
USBR United States Department of the Interior Bureau of ReCtamanonj 196a Land and Water Studies ol the Blue Nile Basin Ethiopia Appendix III - Hydroiogy
WAPCOS (Water and Power Consultancy Services (India) Lto ) 1990 Preliminary Water Resources Development Master Plan for Etmopra Frnai Report Volume 10 Anne* A Hydrology & Hydrogeology Addis Ababa
June £009
Water Works Design & Supervision Enterprise
!□ Association with Inter con Oded tai Consultants and Technocrats Pvl LtdArjc Dedtwa Hydrapowar 4 Irn^adcn Project
Mtttarvtoglc&l & Hydrak^icaJ Feasibility Studies
JuniSDO?
List of Annexes
^ruiEi A Bejklli opuined Itinri 1hc Mriroj'cJnpiciJ Anal) id
M    tviimajizd   Mein lnmpc'iiuf ■ Arjn Drftifj Frcqc. AlMLntf i
A2   T '.nmjiciJ Mrnirvruni T-Hnpcranre m <rjn Dedova Pr;»ic-.r ArrJ | in ri i
>lJ   Eninuied   hkiitnuni Temperit-urd u Arjo-Dcdcisa PVoicd A.'ti i mX i
-U  EsJimaed  Af  IziivE  HurnrJii)  ai  ArjoJMcua  ftukil  4r«  I  in  perc-c-nii
E-flirmajEd Mean Dial;- Sunshine Durational ArpiDrtClW Prui«t Aiea
i idinuicd Mean Dash E Tu irf Arjo Dcdca-S) Pftijefi Area
A“  E  Mnriiiid  Mean  MunLnh  ETn  ul  Arju  LkJt5^  Priijec  Area
AS I- tlinaiid Mean Munich Rainfall al ArjS Detosa PmceI AW#
AM t iiirulcd Mean Elail-Muflthh Ra hlJJ ar tne Ppnjen Aki i ih mraE
Results ubuuwd fiwfl Ilk i1% druio<»cai Anaipis 
h e                        mwirWy Lodfakrw cf wmiora iCV i ul nwiwhl) a
&J RrptfWi tiwnlfiS^ tocffaklU flf sknraesa of mnnltdy flo* 5
R] Reparul mnniTiis LoetiiornL of earn Lui uni i,R.r f'W pumhh Elu* s
iU SlandMiiucd pr-atuHliri weighted Enuniciti :■ wived fcir 5;- nfchctrc llm* -p?i^rMnwa
DS Siitan Mun*h T.™J i Suspended and EkJI Stdimeni Load
Ah E kicartiiHPAtta4"<Kil> RdJHWIshqK nf Ago DnXK4 fowcrvoir
Is" StmnlMiinn K iu< |- ■tir*_ii Far IrTigJiion an-J HydropOKtf < lenerauim al Arp EkJcria Ram
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1)1 Dciji . -.-I Meiciirulugicri tRw-aliw hul^ma iRa’A Data Colls^waia
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MeUsrologlcal & Bydrnlagical Feasibility Studies
ANNEXES
Annex A Results otiiatned from (he Meteorological Analysis
June 2009
A t EsJWHaMc Af#M Temperature a■
PfityKT Jl/W i’.n oC)
Year      Jan          Feb   Marcn    April    May    ju-ne    July         Ajg     Sei1       Ocl      Nov      Dec 1961      22 2       21 a      2* 7      24 D     23 2    21 5     20.7    20 2    21 6     22 0     21 9     rq - 1952      20 0       23 8      24 9      22 5     23 2     21 0    20 D    20 0    21 3      22 i     20 2       '9C 1963      21 7       23 2      24 3      16 3     15 9     21 6     21 i     20 8    31 4     21 7     24 §    21 3 T964      21 7       22 9      25*       24 6     23 7     2i 5      20 4     20 4     21 4     22 0      2i 5    20 6 1965      21 5       21 6      2< a      2* B      23 5     21 6    21 3    2a a    21 5    22 4     23 2    20 5 1956      22 7       236      25 3      24 e     24 1     21 7    21 4     20 8    21 5     22 3     22 0    18 B 1967      195       22 5      25 l       2*8       23 7     21 2    2D 7     20 5    21 3     21 1     23 0    18 7 i9&e       199       22 4      23 0      2* 5      24 1     21 6    21 6     2i 1      2t 2    21 4     21 2      196 1959      22*        23 2     25 1      2*6       24 0     22 0    20 7     20 7    21 5     21 7    21 2     16 9 1970      21 5       22 9      250      24 9      24 3    22 0    21 4     20 5    21 6    22 B     198      102 1971      21 6       20 4      23 9      24 7     23 7     21 i      21 0      199    21 1     22 4     21 7     iB2 1972      2: 5       23 1      24.2      24 9     23 2     21 t?   21 8    21 3     21 6     22 3     22 8    20 2 J 973  22 7       22 6      25 8      26 8     24 1     21 B    21 3     208     21 5    21 7     21 7      17* 1974     21 2       23 3      25 3      23.9      23 9    21 8     2a 6    21 3    21 3    21 2     19 1     ISO 1975     21 0       236      25 9      24 a     23 7     21 7     20 5    20.2    21 3    21 9     20 4     10 9 1976     20 6       23 9     24 B     24 3     23 1     21 0     21 0    20 0     21 6      224     22 5     19 7 1977     23 0       23 5      24 9      25 3     24 4     21 4       21 0    21 3     Zi 9       235     23 0    20 9 1970     21 1:      22 B     26 1      256       238     21 9    20 9    21 2     21 1     22 3     20 9    20-4 1979     22 2       23 5      24 7        24 2      2*2      2? 9    21 3     21 6    J2 0     22 3     21 6    20 9 190C     22 3      24 1      26 1      25 0      2*4      22 3    2* 1     20 B    22.0     22 0    ZZ D    19 5
1981      22 4       22 6      26 2      25 1     2* 7     22 9    20 6     21 1    31 5     22 0     Zl 6     1S 2
1982     22 7       22 3      23 6      2* 9      23 5     il 9        2i 2    20’       2t 6     21 a     23 0    20 6
1983     20 3       23 6     26 1      25 E     25 0    22 e    22 3    2i 8      2i 7      22 4     22 3     186
Hfl* 206 205 25 * 26 2 24 5 21 9 20 9 20 7 21 i 20 2 23 4 20 6
1985     21 5       22 9     25 7      25 i      24 0     21 7    20 6     2C4     21 5     21 5     22 i     19 7
1986      21 5       24 7      239      24 g      2*6     22 0      2i 3    2i i       21 2     21 7     22 0    20 4
1957      2i e       23 0      25*      25 i       2*2     22 6    22 2    2i 6      31 9     23 i      22 ’     20 2
1988      22*        2* 5        Z5 ii      25 8     25 3    22 5     2t 3    21 6     2i 9      22 5     20 6     10 8 1989     21 3      22 3      24 6      24 5     23 3    21 9      2i ?    2i 6      21 7    22 0     21 9     2i 6 1990     21 0      2:1 9     24 B      25 1      18 6    22 4    21 4    21 4     21 9    22 1     22 4    20 9
1991      230       236      25 1      25 1      246     226     21 3    2D 8    32 e    214      21 4     18 2
1992      22 l       24 1      25 2      25 2     24 6     22 3    21 1     21 3    21 8    22 7     Zi 8     21 3
1993      226       23 5      24 3     256      24 4    Z27     21 4    21 4    3i B     229      21 7
1994      218       24 2      28 6      24 9     24 3     22 3     Zl 1     Zl 5     2i 8      22 0     23 3    20 0 1995      22 3      24 5      26 4      285      25 9     23 l      21 9    22 4        22 3    33 0     23 3    22 i
1996     22 8       24 1        26 3      25 9       2*’      21 9    21 7     Zl E     22 *     33 4     22 0    20 2
i j j i        -- ’        _2 4       ii i        25 5    « ■«      4 4           2                22 3     - — 4  2 j         ... _ T
1998
2*5
2* 9
27 4
27 7
28 2
23 4
22 4
22 3
23 1
34 2
22 0
19 i
1999
21 9
22 B
26 2
26 3
24 9
22 9
2i 6
2.1 3
22 9
23 5
2i 0
19 8
2000
21 6
229
25 6
26 6
25 5
22 8
21 9
21 6
23 0
24 0
23 5
20 3
2001
23 0
24 3
25 0
264
25 5
23 0
22.0
22 2
23 0
24 2
23 6
21 6
2002
23 2
23 6
26 9
25 9
25 9
22 B
22?
22 2
32 8
23 3
23 ’
22?
2003
21 9
24 5
26 4
25 7
25 8
23 2
22 D
22 2
32 7
23 0
23 5
2D 6
Water Works Design £ Supervision Enterprise
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In Assoeiatfon With interconliu ETita I CnuilluniS and Technocrats Pvt. lidArjc Dedess i Bydrop+wer 4 trrieittnu Pn»>flfl Muleorolocica] & Hydrological Feasibility Studies
Jum 2009
A2 Estimated Minimum TernptnafuW ar Arjo Dedessa Project Area i m oCj
r
Year Jan [ Feti March Aprt Ma^ . June July . Aug Sepl
1961 9 7 10 5 13 B 14 7 14 9 14 6 147 14 J 14 5
Oct
130
NOV
Iftft
1963      95      19 2     13 6      99      ■0 3     147     ISO      147      144     126      11 6
1962      86      TO 5     139     13 8     ISC    14 3    14.2    14 2     14 4        130         9 5        7 .7
Dec
60
a0fl &
1964      9 5      11 1     14 2     15 0    T5 3     146    14 5    144     144     130      10 l       8 5
1966      8 7      108     13 2     15 0    15 5     147     153    14 9    14 1     12 6
1965     9 4      106      139      15 i      15 i    14 7    15 1     147    14 5     13 2     10 s      8 3
1966      59       114      14 2     15 i     15 5    14 8    152    14 7    14 5     13 2     103       7 6
1967      8 5      ?0 9     14 1      15 i       i$3    14 4     14 7     14 5    14 3     12 5     106       7 6
10 0      8 0
1969      98       112     14 0      150      155    14 9    14 7    1144 67    1144 55     1123 85      19030       67 49
T97T     & 5       99       134      15 1    15 3    14 3     149     14 1    142      132      10 2
1970      9 4       it 1      14 0      152     15 7    14 9    152
74
1972      9 4      112      135      152      149     143     154     151     146      132
10 0       6 2
1973 99 10 9 14 4 1ft.3 155 146 151 14 7
1974 93 11 3 142 14 6 IS 4 14 8 14 ft 15 1
1975 9 2 11 4 ■4.5 15 1 153 14 8 146 143
14 5     12.6     “,0 2       7 1
14 3     12 6      9 0        7 7
14 4     12 9      9 6        7 7
1976      90       ITS      139      148      149     143    14.9    14 7     14 5       132
106       BO
13X7     10 1    11 4     14 0      154        lift     146    14 9   15 1     148      13 9      106       8 5
1961      90       109     14 7      153      160     151    14 6    14 9     14 5     130       10?
1978      ft?       11 0     14 6     156     15 3     149    14 8    150     14.2     13.2       95        & 3
1979      97       11 4     >3 8     14 8    15.6    14.9    15 1    15 3    14 0     13.2      10.2       B 5
198E      9 e     11 7      146      157      156    15 1     150     14 7     14 6       130      10 3       7 9
7B
1583      89       IT 4     14 6      15 6     16 l     15 5    158     15.5    14 6     132       iOS       7 6
1984      90      ?0 0     14 2      160      158     149     14S     146     14 2     11 9      11 0       84
1905      94       11 1       14 4      15 3     155     14 8    14 6    14 4    14 5     12 7      10 4       0 0
1906      94       120     13 4      ISO     15 8    150     151     14 9    14 3     128       103       8 3
1987      95      11 1     14.2      15 3     15 6    15 4    T5 8    15 3    14 8     136       107       62
1908      9 0      119      14 0      15.7     16 J    15.3   15 1    15 3     143      133        97         7.6 i960      9 3      IDS      138      14 9     150    14 9    15 1    15.3     14.6     130       102       B8
1$90      92       106      13 9     15 3     12 0    152     152     152     14 6     13 0     10 6       5 5
1991     10 1    11 4      HO      T5 3     15 9    154     151     14 7    14 6     126       *01        74
1992      97       11 6     14 1      154      15 8    IS 1    150     15 1    14 7     13.4      10 3       96
1993      99       11 4      136      156      157    15 4    15 2    15 2    14 7     135      10 2       79
1994      95       11 7     15 0     15 2     157     15.2    ISO     15 2    14 7      130      11 0       8 1
1995      98       119      14 8      16 2    16 3    15.7    155     15.6    16.0     136       110       90 1996      99       IT 6      14 7      158      1ft 0    14 9    15.4    154     15 1      13 3      10 4       e.2 1997     102      106      15 1      15.6     15 8    15 7    15.6    15.8     156      142      11 8       93 1998     10 8     12 i      153      169      16.9    15.9    1S9     158     156      14 3      10 3       7ft 1999      96       11 0     14 7      16.0     16 1    15 5    154     15 1    154      139        99         &D
2000      9 5     11; 1     14 9      16 2    16 4    15 4    156     154     15 5     14.2     11 1       54 2001      10 1    11 8     14 6      161      Iftft      156     15 6    157     15 5     14 3     11 1       B8 2002     10 2     11 4      150      15 8     166     15 5    16 1    157     15 4     138       10 9       92
2DO3     96       11 8     14 8      15 7     16 7    15.8     156    15 7    15 3     13 6      11 0       6*
2004      1D6     11 7     14 7      163      16 5    15.5    15.3    15 7     152      134      10 9       E-8
1982      99        lCft      -3 3      15 2    15 1    14 9    15 1    14 7    14.5     12 9      10 6      84
Water Works D esign & Supervision Enterprise
In AssceJidtm wtth Intercontinental Consultants ud TecKo«r*is PrL Ltd.
3IrJO' tlcdr-ssi Bydmpower & LrrlteOon Project
Meteorological & Hydro logical Feasibility Studies
A3 f somalft? Maiffflu/n Temperature ar Ayo DecTessa Project Area (in*Cj
June 3009
Year Jan Feb Marcn April May June July Aug Oct NOV Dec
1961 3*7 33 0 35 6 33 6 31 7 28 6 267 26 1 24 4 30 9 33 5 31 *
1962 31 2 33 0 35 8 31 6 31 a 27 9 25 8 25 8 24 2 31 1 30 9 30 4
1963    33 9     35 2     34 9     22 8     21 7    26 6    27 2    269    24 J      306      37 6      K 0
1964     33 9      347     36 6      344     32 4    28 6    26 J    284    24 2      3i 0     32 9      33 3
1965    33 6      33 1     35 7     34 7     32 1    28 8    27 5   26 9    24 3    31 5     35 5      32 6
1966 35 4 35 a 365 34 7 329 28 9 27 6 269 24 4 314 33 6 30 a
1967 30* 34 1 36 2 34.7 32 4 2B2 26 7 265 24 1 29 6 35 1 29 9
1968 31 1 33 9 34 0 34 3 32 9 28 6 27 6 27 3 24Q 3C i 32 4 3i 3
1969 35 0 35 2 36 1 344 328 292 26 7 26 7 24 3 306 32 4 27 0
1970 33 6 3*6 36 0 34 8 33 3 29 2 27 6 26 9 24 4 32 1 30 2 29 1
1971 33 7 31 0 34 5 346 32 4 28 0 27 0 25 7 23 9 31 5 33 i 29 l
1972    33 6     35 0     34 6     348      31 7    27 9    28 t    27 5    24 5    31 4      349      32 3
1973    35 4     342      37 1     37 5     32 9    29 0    27 5    26 9    24 4    30 5      33 1     27 8
1974     33 l      35 3     36 5     33 5     327    28 9   26 6    27 6    24 1     29 9      29 2      303
1975 32 6 35 7 37.3 3*e 32* 28 9 26 5 26 1 24 2 30 8 31 2 30.2
1978 32 2 362 35 7 34 1 3i 5 27 9 27 0 26 9 24 * 31 5 34 5 31 5
1977 35 9 35 5 35 9 35 4 33 4 28 5 2? 1 27 6 24 8 33 0 35 2 33*
1978 32 9 34 5 37 5 359 32 5 29 2 27 0 27 4 23 9 31 4 3t 9 326
1979 34 7 35 S 35 6 33 9 33 1 29 l 27 5 27 9 24 9 31 4 33 1 33 4
1980 34 9 365 37 5 36 1 33 4 29 6 27 3 26 9 24 9 30 9 33 6 31.2
1961 35 0 342 37 8 35 1 33 8 29 6 26 6 27 2 24 4 30 9 33 1 30 6
1962
1963
1964
35 4     33 7     34 3     348     32 1    29.2   27 4    26 6    24 4     30 7     35 2      32 9
31 7     35 7     37 6     35 8     342     30 4   28 8    28 2    24 6     31 5      34 l      29 8
32 2     31 2     365      36 7     33 5    29 1    27 0    26 7    23 9     26 4     35 6      33 0
1985     33 6     34ft      37 0     352     32 8    28 9    26 5   26 4    24 3     30 3     33 fl      31 4
1986 33 6 37 5 34 5 344 33 6 29 3 27 5 27 3 24.0 30 5 33 6 326
1987 340 34 fl 365 36 1 33 1 3D 1 28 6 27 9 24 8 32 5 347 32 3
1988 35 0 37_2 36 1 36 i 346 29 9 275 27 9 24 8 31 7 31 5 301
1989 33 2 33 B 354 342 31 9 29 1 27.5 27 9 24 6 309 33 5 34 5
1990 32 B 33 2 35 7 35 2 25* 29 fl 27 6 27 7 24 6 31 1 34 3 33 4
1991 35 9 35 8 36 1 352 33 7 30 1 27 5 26 9 24 9 30 i 32 7 29 1
1992     34 5     365      363      35 3     33 6    29 6    27 2    27 5    24 7     32 0      33 3      34 0
1993     35 3     35 6     35 0     35 9      33*     30 1    27 6    27 7    24 7     32 2      33 2      31 3
1994     33 7     367      38 6      34 6    33 3    29 7    27 3    27 8    24 7     3= 0      35 7      3i 9
1995 3* fl 37 2 38 0 37 2 346 30 fl 2fl 2 20 5 25 3 32 3 35 6 35 5
1996 35 3 355 37 9 363 33 8 29 2 28 0 28 2 25 4 31 5 33 7 32 3
1997 36 5 33 9 3Be 35 7 33 4 30 8 28 7 28 9 28 3 33 8 38 3 366
1996 M« 37 7 39 4 38 6 Ji 8 31 1 2fl 9 28 9 26 1 34 1 33 8 30 5
1999     34 2     34 5     37®      366     34 1    304     27 9    27 6    25 9    33 0      32 i      31 6
20OT
2001
2002
33 7     34 7      382     37 3     34 8    30 1   26 3   26 2    26 0     33 7     36 0      33 2
35 9      388     37 4     37 0     34 9    3D S  26 4   28 7    26 0     34 1      36 2      346
362      357      387     36 2     352    30 3   29 3   26 7    25 6     32.8     35 3      36 2
2003     342      37 1     38 0      360     35 3     30 a   28 4   28 7    25 7     32 3     35 5      33 0 2004  . 37 e      366     37 6     37 2    35 0    304    27 8    28 6    25 5     31 8      355
Water Works Design & Supervision Enterprise
Id Ajwiatlon with IntmantlwntHJ Co-nsultanuj and Technocrat! PTL Ltd.
4
V»
•3 rArjo-Dedtui Hydrcpowtir & Irrigation Project
Meteorological & Hydrological Feasibility Studies
A* Etfirnared Retefw HunwiMy                      Dedesta Pr^ecf Acea pn fre'wrtJ Yew       Jan       Feb   M.ar-jn   April     Ma>    June    July  . Aug    Se; i     Oct
June 2009
Dec
1961 ' 67 52 46 70 71 78 67 87 B2 62 68 72
1962 77 69 64 73 B6 85 94 94 96 95 BB *
1963 65 72 63 82 84 85 89 91 89 83 87 85
1964 71 66 57 63 75 82 88 66 92 84 73 75
1965 67 52 50 68 69 78 83 85 84 62 66 74
1966 65 65 68 71 73 78 86 90 85 64 80 69
1967 65 50 57 66 76 81 91 89 92 85 89 73
196S 55 66 54 68 75 Bi 68 85 89 Bl 76 72
1969      72         68        64        69        75       82       86       69       8B       80       77       65
1970      71         62        64        69        74       79       86       92       69       66       72       66
1971      63         48        50        64        76       81       87       90       87       87       82       76
1972 64 65 56 70 74 79 89 85 86 80 63 75
1973 65 59 57 66 76 81 62' 88 09 83 77 83
1974      54         49        53        58        78       81       90       90       93       63       72       63
1975      52         59        51        70        74       83       86       93       90       64        73       66
197S      S5        56        57        68        79       81       92      91       91       91       93      82
1977 72 66 58 57 66 Bi 69 88 87 86 8? 74
1970 5B Si 58 & 75 77 87 86 84 84 75 55
1979
1980
1961
1932 67 62 55 65 75 80 88 90 9C 67 86 79
1903 66 63 6i 70 79 78 85 89 89 66 82 72
1984 59 49 47 61 76 80 66 88 86 74 82 75
1985      66         50        Si         07        76       80       90       89       87       8l        77       70
1986      $6         60        57        69        73       85       87       87       88       82       73       72
1987      59         56        63        69        79       81       33       39       &6       85       79       75
1988 72 64 49 62 75 B2 90 91 93 87 73 68
1989 6$ 61 66 76 73 79 91 88 91 B4 62 85
1990      67         70        62        68        77       Bl       90       90       91       BO      80      71
1991      68          69        60        80        74       83       90      91       89       B2       75      75
1992      6H          67        54        69         79       84       90       9<       88       89       84       79
1993      69          63        56        75         80       85       89      89       90       86       62       69
1994      57         53        55        67        76       86       B6      98       89       75       60      72
1995      60        5B        5?        72        79       90      9B      90       92       8<       81       79
1996 72 43 63 73 80 83 89 88 87 fll 69 70
66         65        6i         64        70       77       84       85       66       79       69      67
59         55        53        6B        76       81       B6      B7       65       79       75       65
54          46        56        63        72       76       BB      86       03       32       77       64
1997 1993 1999 2000
1 2001 2002 2003 2004
71        S3        53        72        76      81       86       89       87       86       89      BO 74         66        82        64        79       66       74       74       93       92       78      67
61         48         53        65        76       80       K       89       89        92       73       66
55         48         45        67        77       61       89      72       B9       93       64       74
67         57        58         69         Si       90      91       92       89       88       82       75
71         56        62        64        71       61       85      88       67       84        78       79
71         60        60        66        65       76       90       89       90       64        77       73 66          59        55        70        76       81       87       89       89        91       76
Water Works Design & Supervision Enterprise
Ib Association with IntctctmUDenuil Comnitinls ind Technocrats Pvt. LuijLrjo-DedesBi ByUrepower &■ Intron Project MfttenrdOEfcal A Hydrolo gicJiJ Feasibility Srufles
June 2009
AS.
Estimated                  Sunshine O^iien « Atjo Ded«« ?"■<"<
fm rtfiWjyj Year Jan Feb March
m T1                    ~[~
April   ' May ’  June    July
I9fii       63        7 3       7 1       68        54       65       4.3       62 1962      6 7        69        82        7 B       90       6 3      29       20
' Seen : OC1 No* Dec 9 1 92 89 7* 6 3 65 76 75 58 80 9 1 8 3
1963      7 2        62        8*
1964      98        8 3       7 7       80        87       58      3 D     3-0
88        7 3       44      2 B     3 8      68      9 1       90      100
1965      9 i         8 3       66        65        83       34      4 3      5 5
79       74       84       8 1
1966 78 82 7 T
1967 79 96 84
1966 a i 8 0 7 7
8 5       7 8      fl 3      42       36      6 0       92       93       8 3
1970 too 95 97
1971 8 2 78 75
1972 92 88 74
1973 a 5 8 9 6 5
1969      62         76        75        73         76       6 1      37      4 1
72 9 1 8 1 4.9 5 2
8 1 68 68 23 32
7 8 94 BO 4 8 4 7
7 3       76       6 1      3 7     4 1       62       7 9      8 3      B3
94        83       64       54       48
8 3 B 5 7 6 90
57 6 5 10 1 a 3
62 79 83 83
7.5 79 8 3 8 3
80 8 8 99 77
79        8 1       7 3       67        9.1       5.9      4 8      4 8      5 B      66      0 1      8 3
84      TO 1     7.3      32      4 1       72       9 5       95       90
T 974
1975
1976
9*         83        75        64        71       5.0      3 1      1 6
4 1      7,5      8 4      9.2
52       66       67       a 1
1977      62         63       8.6
94        6.8       7.5       76         78       6 i       23       3.8
90         87        78        87..27       7648       7581       3377     44 11       63       6.9      8 2      8 3
1976
1979
1900
1961
63        6.6       6.0        67 50       6747       5581      23.64       3389      5 9      7 9       78       86
55 6 8 6 9 7 1
4 2 5 B 76 7.5
6 1         63        58
26      6 5       96      7 9
1962      7 4        60        83
1983      80        7 6       7 i        80        66       7.8      54       36
85        8 8       46        655.9       77 91      858B      3397      43 57      67       75       66       7 3
1984
1905
1906
1967
1900
8 T        9.9       a i        89        66       60       4 7      4.3
56 66 84 82
7 0 10 i 66 8 1
6 9        6.2       66
88         78        75        85 a3       72       37       3 3      4 0
64       59       2 8     3.1       5 8       76       87      7 8
8 l 78 62
64 7 6 96
8 3       58       56       4.9       42
4 1 74 94 82
74 76 83 11 0
1909      8.6        84       7 3       72        96       7 3      37      5 1      6.3      6 3      8.2      68
84        8 3      7 0      2 7       49       55      8 5      102     9 1
1990      92        4 9       6.3       33        54       4 8      37       39      5 9      9 5       89       92
1991
1992
1993
1994
1995
a 3        73       7 1       88         54       65       4 3      6.2
9 1      9.2       89       74
6 7        89        82
72         6 2       84        68        73       44       28       38       58      8 0      9 1      a a
78         90       63       2 9      2 0       63      6.5       76       7 5
98         83        77        80        8 7      58       30       30      68      9 1       90      10 0
91         83        86
1996 7 8 82 71
1997 79 96 84
1996
1999
2000
2001
2002
2003
2004
81         8 0       77
82         76       7 5       73        78       6 1      37      4 1       62       7 9      83       83
6.5       6 3      34       4 3      5.5      7 9       74       84      8 1
8 5       78       5 3     4 2      3.8       60       92       98       83
72        9 i       8 1      4 9       52      8 3      8 5       76       90
8.1 6.8 68 2 3 32 5 7 65 10 1 83
10 0       95        97
7 8       94       80       48       47       75      7 9      a 3       13
8 2        76       7.5       7 3       76       6 1      3 7     4 1       62       79       6 3      8 3
92         88        74        9 4       83       64       54       48      80       8 8      9 9      7 7
8.5        89       8 5       84       ID 1     7.3      32      4 1      7 2       95       9 5       90
79 8 1 7 3 07 91 5 9 4 8 48 58 0 1 8 3
Water Worfcs Design & SqpCTMM Enterprise
tn Jtas&ciatlou with IniercootlncDia] Consuliaots and Technocrat! Ptl Ltd
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Arjii Dcdessi Hydropower & Irrigation Prujeti Meuorologlcal & Hydrological FeasibLUty StudJ^
A 6 EjTJmaffld Mean Datfy ETo 4*jo Decfessa Prq-sci 4^ea fr/i mfTvtrayj
JUD* 2MS
Tear jan Feb
1961 3 73 3 93
March April May
June   r Jiilv     Au'i Si-f-i
4 49      426     3 73    3 64    3 04    3 M     4 43
Oct NO* Dec
4 27 386 3 24
1962     3 23      3 75     4 66     4 32     4 43     3 *9    2 63     2 5     3 72    3 63    3 46    3 19
1963     3 48      372      466      3 44     3 36    3 11   2 71       3      3 63    3 98    4 2?    3 56
1964     3 95      4 18     4 65     4 66     4 52     3 45    2 72    2 79    3 07    425     1 as    3 82
1965
1966
1967
1968
1969
1970
3 8<      4 13
3 68      422      4 47     4 73     4 35      34      3 07       3        37      431     4 09    3 35
4 83     4 25     4 43    S 9?     3.1     3 43    4 13    3 88    3 92    3 45
3 45      4 44     4 77     4 45      4.6     3 96    3 15    3.32    4 22    4 03    3 72    3 46
3 53      406      4 5      4 64      4 1     3 71    3 63     29     3 59    3 59    4 06      a*
4 01      4 4$     506      4 58     4 76    4 01    3.21    3.22    4 06    4C+    3.58    3 28
371       406      4 5      4 43     4 20    3 56    2 91     3C«    3 72    3.94     3 7     3 19
1971      366        39       4 49     4 49     4 24    349     2 93    3 01    3 69      4       375    3 29
1972     386      4 34      4 5      5 03     4 34    3 55    3 39    3 28    4 17    4 23     4 2      334
1973
1974
1975
1976
381       4 3      4 87     4 92     4 91    3 04    2 81     309    3 97    4 32    4.01     3 34 ,
3 82      4 27     466      4 34     4 09      33     2 73    2 44     3.2     3 07    384     3 49
358       4 t8      453      4 24     461     3 51      33     3.29    3.62    4 07    1 95    3 35
1977 34 3 85 4 34 4 49 4 24 3+6 2 9 3.1 3 78 3 07 3.86 3 52 !
1978     3 85      3 62     464       47      4 39    3 57    2 50    304    3 53    3 74     379    3.23
1979     3 36       IBS     4 18     4 37     4 08     3 30     264    3 07      33       35      3 64     334
3 73      4 38     4 85     4 75     4 02    3 68    2 93     306      35      3 69     348     3.38
1980 3 29 3 63
19B1 3 78 4 25
1982      36       3 74     4 63     4 32     4 13    377     2 98     294    3 07     386     3 49     3 3
1983     3 $4      4 14     4 55     4 76     4.15    4 06     3+3    3.03    361      3 7     3 82    3 32
1984     3 56     4 31     4 73      502      <08     3 55    3 14    3 11    3 87     4 3      398     3 46
1985     3 73      4 04     4 59     436     3.93    3 53   2 71    2 81     363     3 86    3 88     332
1986 3 43 394 4 31 4 03 4 22 304 2 05 3 08 3 22 3 82 4 01 3 46
4 21 4 39 4.32 3 56 2 93 3 05 37 3 90 366 3 44
399 4 13 4.42 3 53 2 91 3.2 2.06 3 64 4 01 33
1967 3 67 4 14
ioae 3 76 4 2
4 31 4 74 3 83 3 5 3.27 3 18 4 06 4 3.03 396
504 4 82 4.58 3 78 2.71 3 34 3 59 4 17 4 02 3 48
1949 3 72 4 18 4 42 4 39 4 64 3 83 2.97 3 33 3 77
1990 3 38 4 31 3 57 336 3 25 2 92 3 07 3 69
4Q6 3 74 3 24
4 37 3 92 3 67
1991 3 79 405 4 43 4 31 3 82 3 72 3.06 3 59 449 4 22 3 04 3 11
1992 3 42 I'M 4 71 4 62 4 65 3 63 2.73 2 59 3 70 37 361 3 38
1993 JM 3 75 468 4 29 4 25 3 21 2 72 304 3 6? 4 09 3 91 34
1994 3.94 43 4 79 4 65 4 55 3 5 2.75 2 83 3 91 428 4 06 3 75
1995
1996
3 92 4 34 4 95 434 4 53 2 96 3 11 352 4 21 394 3 92 3 59
3 68 4 29 4 67 4 88 4 37 335 309 3 03 3 77 431 4 09 3 46
1997 377 4 43 4 95 4 46 4.65 4 07 3 23 3 46 4 41 4 32 39 3 05
1998 3 91 4 33 4 8 493 4.24 385 2 66 296 3 74 3.83 4 12 3 36
1999     368      4 07
2O0C , 4 03
445
4.67 4 57 4.36 3 63 2.98 3 11 3 03 4 11 3 7 3.42
6 24 4 79 4.86 4 15 3 31 3 35 4 19 4 16 3 92 35
2  2 0 00 021
3 78     4 21      466     4 64     4 42     365     2.9ft    3 16    3 04    4 19    3.92    3 57
4        4 39
2   2 0 00 043      33 87 45      44 4289
4 75 5 13 4 59 371 3 46 34 4 29 4 34 4.24 3.54
4 49 520 44.8521 45 A063 33868 23 28 25 331385 43.0782 44 2471 420169 33.6631..
In jtaMliti WanaWteitrhWiBorUrkeso&DtelDsUiglan l C&wSuuutpetutsrviinsdioTn  ecEhnntoecrraprt PisWe Led.Ajjfrtedtua Hydropower & [rrifltiMi Project HEteorolOElcillkHytailoglci^BisIblJl^^nii^e^
A7 Estimated Mean Monfflfy ETa of A?a Dedessa Project Area
lin mmJmonim _ _                 ______ ___ Year     Jgn     Feb Marco April       May   June
l9£i     ■ 16    110    139      128    116    109 196Z     100     105    144     130    137    105
1963     IDS     104    145     101    104    93 2
1964     122     117    144     140    140    104
1965    119     116     IM      12a     137      89
■ 1SG6     1H      118    138     142    135     102
1967     107     124    148     133    143     118
1968     109     114    140     139    127    111 1 V969     115     114    140     133    133     107
1970    124     124    157     137    140     120
1971     113     109    139     135    132     105
1972     120     122    140     151    135    106
1973     1i8     120   151     146    152    115
1974     111     117    140     127    143    105
JUty   Aug   Sept Cti      Nov    Det        Annual 94 2   110    133   132  116    100         1403 61 6   77 4   112   112   10*     59          HOB
64    92 9    109   124  127    110         1303
64 3   666    11$   132  116    119          1420
96 2   106    124   12$  118    10?         1410
95 1   93 1    111   134  123    104          1400
97 7   103    127   125 11:1     10?         1444
81 4  69 9    108   111  122    IDS         1358
90 1   S4 8   112   122  111      ss           1369
99 4   997    122   125  107    102         1406
90 8   93 2   111   124  113    102         1366 106    102    125   131  126     104             1466
67 2   95 9   119    134  120    1Q4            1464
102   102    nog   126  58 6    104         1346
1975      lift      120    144     130    127     99    84 7  75?     96     120  109    108         1332
1976 116 123 144 143 125 111
1077 105 108 IM 135 132 104
‘ 1976 119 101 144 141 136 107
1979 104 »09 130 131 126 Id
138C 102 102 130 132 134 107
1961 117 119 124 124 137 106
90 8 948 105 115 104 105 1375
90     96     113   520  116    1<H         1362
80 94 2 106 11$ 114 lOO 1359
B1 9  $5 3   98 9   IM     109     104         1299
9D.9  04 5   111   123    no     107         1343
90 1 $9 2 85 5 113 120 102 133-B
1982     112     105   144     129    128    113   92.3   92 5   116    120   10$     102         1158
1983 110 116 141 143 129 122
19B4 111 121 14$ 151 127 107
106 94 108 115 115 103 14X11
97 4 966 116 133 120 107 1432
1985 11$ 113 142 131 122 106 84 1 H7 1 109 120 516 103 1349
1986 108 110 134 121 131 91.3 882 95 5 96 5 lift 120 107 1320
'987 IH 116 134 142 119 105
■988 117 116 15$ 145 142 113
Id 9S 122 124 115 123 1412
84 2 103 108 129 121 108 1443
1989     115    117    137     132    144    115    92    105    113   126  112    100         1403
1990     118
948
133     107
104    97 *
908
95
in      136  117
114
1310
1991     117
113
137     129
118    112
$48
111
135   131  115
9$4
1411
1992     iOS
110
146     139
144     109
84 5
8t}3
113   115   106
105
1360
1993      no
1«
145     129
132    964
84 4
94 3
110   127  117
105
1355
1«4     122
120
148     139
141     105
85 2
$7 8
117   132  122
116
1437
1995    122
12*
154     130
140    B9 4
964
109
126   122    lift
lit
1439
1996    1.14
120
142     147
135    101
95 8
94
113   154  173
107
1435
lf»7    117
124
153     134
144    122
100
107
132   134  117
119
ms
1998    131
121
149     148
132    115
B2 6
91 9
112   119  124
104
1419
1999    114
114
145     137
13$    >09
924
98 3
115   127  111
106
1402
2000     125
124
162     144
151     125
103
104
126   129    lift
109
1518
2001     117
118
144     139
137    110
92 4
98
11$   130   116
ill
1429
'2002 !   124
123
147     154
142    111
107
106
129   135  127
ilO
1515
2OC3h 116
12$
153     145
157    117
oaz
98
122   139  126
112
1498
3MM 1 119
120
142     135
1»     ia6
100
104
112   130 61 7
112
1393
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[q AuvcIittoD with tntercoDtineDftai ComuILahie uid TMtaocruts Pvl Ltd
9Dtdessn Hydropower & lrtjitloa Project
Meteorological & Hydrological Feasibility Studies_________________________ June 2009
tsftmsred Mitan Monthly Rawifafl st Arjo DedcSsa Project Area
[w mmj
Ywr
J*n   Feb  Wirch   April     by     Jyrw    July 1 Aug $wni Oct            *»g*
Annual
1967
156    0      963     21 7     172    172     140    220     220   111 5   151    0 12      1320
1&6B
1969
19?G
0    57 6   0 75     364    93 8    169     186    207     192   90 97  21 7   14 5      1070 37 7 35 9   53 7     140     121    144     159    212     165   56 39  7 39     0          1132
29 2   30     5i 3     21 2     149    154     249     162    266   107 2  4 44   40*       1217
19M
113  0 32   20 7     30 a     142               180     136    252   188 2   32 3   14 1        1210
1972    156 11 1     IS      B9 1     53      166     186     157    170   49 4?    69    9 24      9906
1973
1974
1975
0    9 97   5 66     29 4     236     155     186    233     143  58 82   12 2  5 77      1075
38 7 7 98   31 8    5 14    287    205     242     16B    212   72 7B   <6?   16 7      1292
23 5 55 1   21 1     60 4     116    124     189     159     141   131 3    i: 5    12 5      1045
1976
23 7  16.2   90 3     55 a     154    154     192    215     273   B8 66    36    5 37      1303
1978 3 3 5 865 103 122 154 206 206 181 122 6 0 58 12 5 1181
1979    156  8 89     17      25 6    97 5    202     235     159     154   64 94   31 2   12.5      1024
1980     156  178    57 3     118     184    100     136     176    246   49 87   28 7     □          1110
>993   156  S23    27 6     35 6     149    213    296     270     177   1139   57 2     0         1362
1984   156    0      31 6     69 8    234    249     443     198    230   8 716   26 8  5 77      1514
IMS    2 79   0      12 3     105    257    341     242     212     315    48 2    32 6  37 7      1607
1986     0    39 2   46 9    56 4    37 5 '  315    274     244     191    103 8   35 9  04$       1345
1987   2 69 172   BBS     79 9     123    282     486     328     183   116 4  42 3   34 3      1785
IBM    14 1 42 7   74 3     15 J    335    325     177     297     343   259 9   154   3 87      1903
19W
1990
1991
’992
1993
1994
1995
i«6
1997
256  26 7   76 3      toe     2<5    284     316     332     297   169 3  61 3   47 1      2008 8 77 37 8   50 4     83 3    906    436     22B    319    241   73.B9  33 4   3 12      1607 264  791    68 2     74 4     139    106     364     305     222   96 59    35      13       1484 24 8 32 8   106      105     222    225     267     291     250   104 7  53 6   15 8      1697
1 04  31     69 5     100     213     313    217     347     166   149 4   203     □          1609
11 2 1 15   20 1     53 9     127    227     255     228     279   B 467   137     0        1273
0    22 9   75 5     109     222    195     229     310     279   B6 46   112   223       1563
45 5  19 1   162     71.7    338    225     245     197    215   74 57   44 8   7 56      1646
39 8 0 97    566      139    293     314     205     291     234     213    40 4   2 54      1B30
1998     13    84    81 1      152     162    260     264     272     239   236 9   672    1 04      16M
1999
200C
2001
2002
31 7 2 91     15      92 3    393    427    257     239     309   197 3  a B9  *2 1       2014 0      0      3 69     105     195    345     222     260    274     255     344   7 39      1702
2003
2004
0     32     65 5     60 3    327    346     29B    292     312   206 1   19 9  24 1      1983
177  .219   39 7    42 2     1D6   252     274     153    224   59 11   t B4   53 1      1226
584  53 5   117       i2i      58 9    358     232     300     155   51 59   11 5  i e*       1466
4M    2 1     6’ 2     51 5    ISO    353     326     243     ?4&   193 9  40 7   131        1689
Aw*f* ?53 16 4 53 6 69 5 pm a 243.0 245 9 238 3 228 6 1155 31 4 12 7 1452.9
Cv 0 65 0 96 050 0.55 0A9 0.37 O.Jl 0.25 0.24 0 591 0.9 113 0.209
**"
Hu
Mln.
062  0 78   0 74      01     0 52   0.38    1 44   0.07    017    0 635  2 31   T <8      0.26
45 5 57 fi  161 7   133lil  392 7 437 fi  487 6  346 8  343 f   259 9  TSO 7 S3 P   2014.6 00    00      oa       5 1     37 5   TOO 3136 2  135 3  ’45 3     85       06                 990.6
Water Works Design & Supervision Enterprise
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Meteorological & Hydrological Feasibility Studies
^9 rsTuna/ed Mean Halt Monthly Ramfal at the Protect Area (tn mm)
June 2009
f.f
3.1     32     4 1     42     5.1      52      S f     42      7 1     7.2     t.f     a 2     91     92     10      10    11.1 11        12 f 12
TofJH
—
Y«r
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1978
1979
I960 1983
1984
1985
1986
1987
1988 1909 1990 1991 1992
78
0
26 1 21
11
7B
0
30 6
0
23 7
3
78
76
70
78
03
0
0
94
18 6
0
14 2
0
12     21      22
7 79    0       0
0     57 3  0 29
n 6   14 7  212
27 1   7 27  22 7 0 27  032     0 7 79  4 31  684
0     997      0
8 12  2 26  5 72
23 5  47 7   74
0     103   589
0      35       0
7 79  8 69     0
7 79  8 89  8 89
7 79  7 90  0 25
7 79     0       0
2 49     0       0
0     2 75  364
2 89     0     17 2 4 73  266    40
7 03    26     07
8 77   13 1  24 7
12 2     0     791
24 8   17 7  15 2
22 4  73 9     0    217   75 2  95 97   112  60 8    6B4    71 7  110   110   132  87 7   110   1 92  75 7 75      Q 12     0
1320
0    0 75  1 27  35 1   31     62 0   814  87 4   82 5    104   121   86 1  76 5   115  76 8   14 2    0     21 7  10 3  4 25   1070 1
37 6 16 1  6 7$   133    16    103 1  72 3  71 9   55 2    103   105   10S  83 6  61 7    36   20 4   3 46 3 92      0       0      1132
23 6  27 7   173   19 5  343   114 3  494    104   127 4   122  81 7  79 8 94 4   16?    so    57 3  4 44     0       0     4 04   1217
4 62    16   304   0 46  42 1  99 06  62 2  131    63 4    116  61 4  73 9  125   137   104   84 3  26 0 5 40    3 17    11     1210
0      15   36 5  52 6  25 5  27 53  78 1  67 9   87 2     99    09 7  67 2   942  75 0  25 7  23 8  61 3 7 69       0     9 24  990.6
0     566  254   404    140  96 39  962   58 9   91 6   94 2   100   125  78 8  54 1  57 1  1 73  122 0            0     5 77   1075
19 9  11 9  0 29  4 05   188  98 87   102   103   1195    123   101   67 5  102   110  44 4  28 3     0     4 62  4 62  12 1   1292
0 69  204  5 14  55 2  67 5  48 89  808   43 3   75 2    113  62 1  969   92 5  40 8  869   44 4  115     0      606  6 46   1045 57 9   324  322   23 5  708   74 81    72   81 8   102 9  89 1  51 9   163   198  74 2  40 1  48 6    32 3 98     2 89  2 48   1303 564    101   124   909   49 1  73 14  87 8    66     79 7    127  71 2   134   848   965   72    50 5  0 58     0      6 M  6 46   1101 046   16 5  11 6    14   57 2  40 35  99 6  102    145    903   85 5  73 6  97 2    57    40 4  24 5  156 156     5 06  6 46
1024
27 7   296  28 6  89 8  64 2  100 3  416   58 7   65 6    70 6   99    76 5   138   109   26 3  23 5   11 9 16 9      0       0
1110
18 7  8 89  20 7  14 9  54 3  SM 53 89 7  123   168 1   128   134   136   89 9  86 7  78 7  35 2  44 2    13      0       0
1362
4 73   269  17 3  52 5  53 9  180 3   138   111   232 6   211   51 8  147   66 7   183   7 16  1 56  1S2 116      496  0 81
1514
1 5   10 8  57 5  47 0   121   1366    168   173    94 1    148  02 6  130   160   155  37 2    11    24 9 7 56     369  0 81   1607 152   31 7  281   20 3  1 24  36 22   195   119   147 6   127   110   134   114   77 1    85    10 9  28 2 7 68    0 23  0 23   1345 481   40 5  6 93  72 9  192   104 3   155   124   224 5   263   215   112   116   668   01 4   35    31 2 11        343    0      1785
57   17 3  0 98   14 3   145  190 2   172   154    751     102   175   122   179   164   155   104   154     0       0     387
1903
43 9  32 5  65 3  42 7   148   96 74   182   102   208 4   107   186   145   194   104  91 5  97 8  29 5 31 8     198  27 3
2008
21 6  28 8     0     83 3  60 3    30 3    253   185   123 1   105   108  211   98 1   143  53 4  20 4  32 4 1 03    3 12     0
1607
37 6   306  127   73 2  89 9  49 04   13 3 93 1   195 1   169   179  131   144   77 9  97 3  1 27  10 5 24 5    12 7  0 29
1454
25 2   806  334    102   152  7012   02.1   143   161 3   1°$    159  131   102    148   01 4  233     29 ?4 6      1 15  14 7
1697
Water Works Design & Supervision Enterprise
Id Association with Intercontinental Consultants and Technocrats Pvt Ltd
11ArJo Dednjii Hydropower t lrrtaatitra Project
Meteorologicil & Hydrological Feasibility Studies
Annex me AS confd. (7n mm)
■--------- T
1f it 91 ai Ad Xf 4.1 4J 11
June 2009
12 M 412 M 7.1 11
12 Xf 12
10       10 Iff 11 12.1 12 j
Year
1993
0 1 04 6 64 24 4 3 06 66 4 63 6 36 e 93? 119/ 86 2
222    79 7    137 149 197          104   61 9 63 9 65 5 1 39 0 65              0      0
1994
1995
11 2 0        0 1 15 1 3 10 6 29 2 24 7             55 71 64 105          122 109 7 145 116 111               166     112    7 24 1 23 9 52 4 16           0      0      1223
0      0 56 17 3 0 765 062 109 116 105 9 53 4 131 1239 105 177 1 33 125 1 54 4 0 6 4 5 7 5 95 5 3 1 96 20 4
1563
1996
1997
9 2 36 3 4 09 15 76 0 62 9 26 6 45 1            146 192 4 159 66 1 04 7               160 100 96 6 93 2            122    55 2    16 4 6 40 36 1 069 5871         1645
2 137 5 0 097 20 1 20 5 72 0 666 71 7 221 5 152
161   786 127 165 126               140    058     119 942 26315 1 0 06 240                 1530
ms
1999
2000
2001
2002
2003
11 2 1 64 1 94 0 46 24 6 56 5 6 09 6 33 69 7 92 10 14? 130 141 7 122 131 142 118 121 92 9 143 62 3 4 92 0 1 04 1638
20 3 3 35 0 2 91          0     15    19 73 3 227           166    209    217    99 2    156 t41 OB 2         146     16?     140    48 9 8 89 0 26 6 15 5              2014
0      0      0      0 2 31 1 39 204 7S2 769 1166 215                    129 99 4       123 149 112          139     135     168 87 1 252 9 15 2 69 4 5,              1702
0      0 23 7 03 174 64 3 36 9 23 3 96 3 230 8 122                     224 118 2 100 126 165               187     124    96 4    110 7 2 7 12 7 14 4 9 75        19B3
12 5 519 0 219 837 31 3 37 7 449 198 86 64 1 39 114 156 4 118 SI 7 10? 954 1 29 35 3 2 3 6 0 1 04 3 2 9 4 9 0
2 3 84 17 8 35 7 39 2 77 6 68 0 52 3 20 3 38 67 165 02 4 76 1 4 0 7 10.6 50 6 9 7 41 0 28 5 121 9 148
193 127 5 105 133 166               85 9 691 237 27 9 6 64 4 91 1 4 0 46
1226
1466
2004
Avtitp
204 256 7 69 6 91 1 152             132     117     108 25 7 11 3 29 4 9 24 3 68            1609
7 5 7 8 8S 9 6 20 8 33 0 J?7 46 7
76 2 102 6 119 8 123 2 1220 12J 9 117 121 8 120 0 100 5 73 7 4r 8 19 7 11 0 6 1
6 5   1452 9
CV     1 18 f 28 1 46 1 21 1 03 0 74 0 95 0 72 0 66 0 5H 0 46 0 41 0 425 0 31 0 36 0 29
SklW
Wil
1 27 1 82 2 47 1 27 0 95 0 83 0 95 0 63 0 94 0 84 0 41 0 57 1 039 1 64 0 38 0 47 0 7?
0 3    0 32 0 58 0 80 0 94 1 26 1 57 1 5                0.209 0 1     0 63    1 11 1 42 2 61 2 15 2 9          0.26
30 6 37 5 57 3 40 0 76 6 82 9 72 8 133 1 226 7 230 8 252 9 226 8 256 7 263 1 31® 210 9 198 4 164 1 168 3 143 0 7$ 7 75 0 36 9 49 8
2014.5
I Mil*     [00 OO 00 00 00 00 00
05       1 2    27 5 133 433 55.2 69 6 51 7 67 2 66 7 48 8
7 2      1 ?    00 00 00 00                 990.6
Water Works Design & Supervision Enterprise
In Association with Intercontinental Consultants end Technocrats Pvt. Ltd
12Arja-D«de»i Hydropower & IrrtEitiM Project
Meteorological & HydrologicalFca-sdblljty Studies
Annex Q Results obtained from the Hydrological Analysts
0 T Regwnet monr/Wy coefficient of vanatior>s (CV) of fluonittify flows
_____ JuaeMMg__
S^NtM
114001
114014
114005
114004
114003
91000
91012
Veaf
35
20
23
22
21
38
35
0 51
0 47
0.28
0 33
051
0 68
061
Fen     Mar   Apcft May June Jut)
0 57     066    0 68  D6Z  0 45   0 35 0 46     0*8    0 56  0 69  053    0 27 041     0 33    0 43   08    047     0.2 0 42    0 45    0 55  0 56  0 43  Q 57 0 83    0 57   0 71   068   0 58   0 35
i 3       0.7      06    O.ftt  046    0 29 0 49    O7ft    0 49  0 57  0 42    0 3
4"ff. S&p Oct !fifov Dec
03       0 33   0 67  0 62    0 59
0 33     0 28    056  0 81    0 53
0 16     0.25   0 44   0 3     034 0 38     CUtJ   064  D 35   0 33 0 25     0 36   0.56  0 46    0 55 0 32     0 28    064     1      0 M 0 20     0 32   0 52    08     0 59
B2 Regional monthly coefficient of snewness of monthly ficwts
Station   rear       Jan Feb
Mar April Me/ June July
Oct            Dec
114001
114014
1.114005
35     0 63     0 74     1 07      0 94 1 63 0 89   0 13   0 04     0 25    099   1 37   096
20     1 35     031     0 47        0 8i 0 85 103    -0 5    0 93     0 89    0 6?   26     1 90
23     0 33     1 <8    0 59       -0 1 2 18 1 54   0 07    045      OBI    0 42  0 52    1 M
9100S    80
91012 35
2 73 029 326 0 77 1 14 0 81 0 17 1 14 1 13 C 77 3 14 2 M
3 17 49* 1 22 1 5 2.34 1 15 0<3 094 0 05 IE 2 66 2 7$
B3 Regional monthly coefficient of correlations (R) for monthly flows
rear
Jan Feb Mar April Mai June July   Auq              Sep Oct Nov Dec
-------------
114001    35      4)1      0 83    0 89   0 59    03
114014    20     0 36      05      077    056  0 62
[114005    23     Oft*       05      0 35    03    064
114004    22       08      a 52    0.2i   0 52    06
114003    21      084       03     a.18   052  0 45
91003     3a     0 27     0 33    0 37   0 27  0 53
0 78   0*5    0 53     0 44   0 45   0 74   0 78
Oftl    04ft    Q54     0 2ft   -0 04 0 65   0 78
0 38   0 48   0 68      08     0 83   025    0 16 O5B   0 58   069      0 61   0 77  0 37    0 14 0 73  0 68    056      058    0 82   056     Of 0 59  054    0 55     0 46   0 45  0?7     0 62
9l0t2
35
0 12     0 83     072   0 48  041   0 72  0 53    0*1      0 46    031   0 44    0 65
Water Works Design & Supervision Enterprise
1h A55dci4X1od with httercontiMHiil Conan.Lunts and TflchnncnEs Ptl Lw
I)
$
11
11
1 m 55Arjo-todm* Dvdrcpower 4 LrrtfBTlMl Project
NeiMrologiriJ & HydrolotfcjU Feasibility Studies
S4 Sfantfaftfriw profiab^ry wtfjghrW monwrs fljTwcf ftx Syfifneftc flSw generation
JuncSXH
StAtiOA
qf Station
Loe
Araw    Record
PWMfl-
bag N. Deg E
t        m tfi
prl 1lfc__
1140C1    Dedessa near A/jo
Upper Dedessa near
8 41    36 25    9981        29          0 40739   0 243171
2   114014
Dembi
8 02 38 23
1606
15
0 420504
0 28295’
3   114005
Da tian a near Abasina
9 02 36 03
2BS1
18
0 414042
0 253945
4     91006
Gilgei Ghibe
7 45 37 11
2966
37
0 400025
0 24Q84’
5    91012
GojeO near She&e
7 25 36 23
3494
34
0 4DS619
0 248091
6   114007 114004
Angar Gdtih near
Neqemte
Warns ne»* Negemte 6 53 36 4 7
1975 20
21
0421145
0 419805
0 254033
O 254029
a 114003 Sitfs near Meqemie S52 35 45 951 20 0 416527 0 251324
9 115000 A>ePtu a1 Nero 9 3D 35 3 155 7 0 400261 0 247582
ID   101001     Ser at Melu
6 19 35 36        1822        17          0 401323  0 244658
11 91013 Gbibe-Limu near Limu 8 35 37 13 663 10 0 425295 0 261749
12 91001 Greal Grube near Aoefli 8 14 37 15 15460 19 0 424754 0 260656
Weighted Average
I
255        0 4 T1954  0.250375
Water Warks Design 4 Supervision Enterprise
In AsuctnUan with latenentbicatal CetuulUmU ud Technocrats Pm. LUI
14Arjo-DedesS* Hydropower &. Irrigation Project
Meteorological & Hydrologleal Feasibility Studios
65 Atean Monffvy To/ai (Suspended and Sed.1 Sed/menr Load
at Arjo Dectessa Oam Site (In 1000 m )
'Tear Jin March April May Jurw July Ajfl S*p Oct Her Dec
June 2009
J
i------------- —I1 Annual
1961
4---
1962   2 56   0 94     0 61      1 07    3 18   22 4    114    216    319    169    6 92   241
2 11  "lI 75
l 27       5 73    311    33 4    315    523    476    372    32 3   15 3     1781
078 9
'963 1 3 0 4? fl 39 1 6 11 3 40 a =29 403 264 50 4 16 5
19&4 1 78 1 32 0 71 1 07 234 23 6 262 37-0 322 387 19 7
14 3 932.5
3 74 13»7
1965   2 37   0 72     □ 34      1 91    0 79    14 3    182    263    135    227   40 1    127      880 6
1966   354   3 13     2 54      3 86    2 88    224     190    277    338    102    406    9 14
395.4
1967   0fl4    0 57     a 57      0
3 16   22 4     140    356    333    352    71 4   20 i       1300
^966   5 73   2 22     a 52      0 22    2 26   2 27     123    265    299    102
10 4   2 97     Bl 5.6
1969   2 07   1 92     3 22      1 <2    371     +6 i     224    427    205    102    5 13
1 78      102*
1970 1 09 G 75 04 0 23 1 72 33 8 216 246 205 102 >61 2 85 BW 7
1971   1 25   0 36     0 18      0 22    2 25    25 5     :78    315    226    164    36 9   6 6*       H8 3
1972   2 17  0 60     045        12     2 44    8 09    171    342    146     199      fl      2 18      764 9
1973    0 7     02       0 05     □ CM-  704     2BS     123    246    425    105    11 fl   3 05      9498
197* 122 0 35 0 28 0 13 5 51 29 119 360 205 102 8 23 1 94 833.7
1979 1 91 1 29 0 65 0.59 1 79 9 43 08 9 179 115 28 6 5 63 1.64 .434.5
1900 0 39 03 015 3 41 17 2 82 0 211 3ES 352 546 6 55 5 39 1698
1M2 2 69 096 0.83 0 45 1 74 26 7 140 223 138 157 155 5 58 711.7
1983 161 1 03 1 09 0 61 2 10 12.3 97 7 300 296 339 29 8
1964 1 3-3 0 35 02 0 14 0 82 167 138 127 87 3 9 39 155
8 32 1069
5 24 403.1
02    006      D 02       02     2 87    14.6     65     216    IBB    28 2   4 31    1 71     5J0A 19M   0 36   a id      0 33      0 26    D.23   8.2T    68 3     70     151    21 9   15 5   5 24       349
1987 0.23 0 07 022 0 3B 1 23 22 4 91 7 3O1 :32 53 1 13 3 3 28 818.6
1966   1 44   fl 78     0 52       0 1     1 24   32 4    94 8   246    205   1D2    17 3   1 31     703.4
1969   2 38   0 63     046       l 08    0 76     04      304   80 1   284    102    696    8 52     525 4
1990   2 24   0 95     i 08       282     1 53   12 9     44     246    205    :O2    155    5 24      639 8
1992 064 0 62 026 0.5 2 45 13.3 49 1 179 994 172 13 8 3 72 534 7
1993
!??*
tW5   0 48   0 23     0.29       0*5     1 31    463    22 4   90 7   70 2   12 5   2 75   5 24       227
1 56 0 84 0.S4 2 37 6 63 38 5 107 308 119 57 7 15 5 2 94 650.6
1 36 G4B 0 31 0 32 2 68 22 89.2 335 104 12 5 3 37 1.24 5524
T996
1 78   0 67     071       0 93    10 7   51 2     145    189    109    102    15 5    4 9      831.5
2001
4 72
2 93
3 15
2 55
91
57 5
150
261
250
129
21 i
7 29
IM3
2002
6 DI
266
2 37
3Dl
I 78
152
59 5
105
103
20 i
7 02
4 61
341.1
2DC3
.2 44
1 28
2 43
3 30
1 89
8 37
123
123
205
102
155
5 24
M4 5
2«M
2 16
1 43
09
084
308
19 2
87 1
119
122
W2
10 7
5 24
481 9
Water Works Design £ Supervision Enterprise
In AasoelaUOD with lnteramtinentaJ Consullajats and Teetmotruis Fn Ltd
15Aj-jo Dedtssa Hydropower & tmeation Project
Meteorological & Hydrclcfica] Feasibility Studies
B6            E(BvearjQfl'>Vea-Cwacify Reranonsh^s of AtyO DetJessa /?e$ervo*r
June 2009
E/eveUoji
4m ash
Area
(W;
Volume       E/evefrpn
[m asfj
Area velum*
(Mm’ji
— 1
1320              054
00               1356            87 85           1341 2
1321              0 99               08               1357            90 75           1430 5
1322             2 39              2.5              1356            94 18           1522 9
1323             3 78               55               1359            97 23           1618 6
1324             5 11              1Q0             1350            100.54          1717 5
1325             6 64              15 9             1361            103 64          1819 6
1326             a D3             23 2             1362            106 39          1924 6
1327             9 46              31 0             1363           109 00          2032 3
1326            10 67            42 1             1364           111 91          2142 8
1329            12 6?            53 9             1365           115 05          2256 3
1330            14 40            67 4             1366           117 68          2372 6
1331             t5 89             82 5             1367           120 20          2491 6
1332            17 74            99 4             1368           122 76          2613 0
1333            19 46            1180             1359           125.28          2737 1
1334            23 59            1395            1370            127 69          2883 5
1335             2665             1546            1371            130 25          2992 5
1336 29 05 192 5
1337 31 73 222.9
1372 133 03 3124 2
1373 135 45 3258 4
1336            34 24           255 0            1374           138.08           33952
:339             36 62            291 3            1375           142 38          3535 4
1340            39 45            329 3            1376           145.27          3679.2
1341            41 97            370 0            1377            148 00          3825 8
1342            44 25           413 1            1378            150 75          3975.2
1343            47 05            456 8            1379           153 73          4127 5
1344            49 95           507 3            13®O           156 02          4202 3
1345            53 11           558 S            1381            159 09          4439 9
1346            56 31            613 5            1382           162 13          4600 5
1347            59 15           671 2            1383           166 96          4765 0
1348            61 56           73B.8            1384           173 01          4935 0
1349           6 3 97           608 7            1385           17S 50          5110 8
1350 67 86 874 ?
1351 70 62 943 9
1352 74 35 10164
1353            77 as          1092 5
1354 81 28 1172 1
1355 64.51 1255 0
1386           183 38          5291 8 1367           188 10          5477 5 13SB           193 28          5668 2 1389           197 36          5863 6 1390           201 96          6063.2
1-----------------
Wuer Works Design & Supervision Enterprise
tn isaeciiUon with IntercontLaecul Consnltnnta md Technocrats Pn LtdArjo Cedes J* Hydropower & irngauou rrujavi
Meteorological & Hydrologic!al Feasibility Studies
B7
June 2009
Year ■nd
Marflh 1961 62 SFP
1961 62 Ocl 1961 67 No* 1961 62 Dec 1961 62 Jan
Siarw*g
Slfraye Mourn
Inflow !
Inigal'On
Stooge l leoutremenl Sitvage Aeservo
Power
u release Slotage 3 Mea*i
1Head
Power
Mcum      Mcum          Mcvm       2 Mturn        Zone        Meuffl        Mcurn « 1 eval m
m
MW
7566
7SB6
?5M
2586
2629
2367 2223 2066 1920 1791
1766
900          34 65                  12         3474 tufplt                    142          3337         137© 661           3247                   1*         3233 luipls                     142          3091          1376
292           2678                   3        2675 tvrpH                     142          2733         1376
101          2687                 15        2671 xyipluS                14?          2529         1376
36          2564                 29        2535                2           146          2387         1374
19          7*06                 35       33? 1                2           140          2223         1374
19          2242                 26        2216                2           148          2068         1374
6          2073                   5        2068                 2           146          1920         1374
21            I94t                    7         1939                2           140          1791         1374
167          11MB                32         1916                7           148          1768         1374
395          2166                   9        7157                2           146          2009         1374
S9
23 79
59
23 79
59
23 79
89
23 79
57
23 96
End
Energy Surplus Storage
GWhr         Mcum       Mcum
17 13          7 4-G        2586
17 13           808          2566 17 13           147          2586
17 13            -57          2529
17 25           199         7367
1961-      62 Feb
57
23 96
17 25
-363
22?3
1961 62 Mai 1991*62 Api 1961 62 M»y 1961 62 Jun 1961 62 |U> 1961 62 Aug Mun
196? 63 Sep 1962 S3 Od 1962 63 Nov 1962 63 Dec 1967 63 Jan 1962 63 Fab 1962 63 Mai
1962 63 Apt
57
23 96
17 25
■516
2068
57
23 96
1? 26
■66*6
1920
ST
23 96
17 25
-796
l?9l
87
23M
17 24
-818
17 68
57
23 96
2009 2253 ?S
561           2570                 10        2560                2           146 145
2412         1374
87
23 96
67 667
23 90
2412
2566
2586
2808
2374
2220
7049
1087
1754
3312                 12          3300 turpbjx                142          3150         1376
512            3W                  14         3084                1           142          2947         1376
65          2651                   3         2640                 1          142           2808         1376
32           25W                 16        2822                2           146          2374         1324
23          2397                 29        2366                2           14fl          2220         1374
12          2232                 35        2197                ?          148          2049         1374
12          7061                  26        2035                2          146          1667         1374
31           1916                   8         1913                3          159          1754         1370
112 1666 2 1864 3 159 1705 1370
59
23 79
59
23 79
59
23 79
57
23 96
17 ?8           87?          2009
17 2S          -174          2412
206 82
17 13           57?          2566
17 13           356          2586
17 13             6Q         2SP6
17 25           212          2374
4?
23 96
17 25
-366
2220
S?
23 96
17 25
537
2049
87
17 25
699
1667
S3
23 93
17 23
632
1754
1962-      63 M«V
1962 63 Jun
1705
S3
235
1940
32
7393
17 23
001
1906
17U5
3
159
1749
2022
1749
1370
53
1962 63 Jul
*30
2179
9
2170
23 93
17 23
■fl 17
ms
3
146
1962 63 Aug
626
2022
1374
5?
Z34R
10
2836
23 98
17 25
564
1
142
2022
Mean
2154 167
2696
1376
89
73 79
17 13
148 78
no
2586
86 67
23 90
206 47
Noie 1 t ha Rebases n any rrwnih ti arn«d ai "Tergal Power oi ?4 MW _______lh_e__re_b_a_t_e_s _i_n_a_n_y ,n.vooXh fo* power
>ft eased on lhe
------------------- —
ftorogt a She begtnmng ol me mwiih < Thai ft lhe
are tel 1oi lha Zona in which lhe sioiaga «6 Handing all
Ncrt«2 The FRL ix’iafl 1376 mam The mriwnuim otwiaung level 1oi powei it kep4 al 1353 rnamM
TN Rawvw ft divided mWfl rones 
Zone 1 is ftuiplut Zone abo*-e 1376 mamxl Zona 2 ft Sloragn balween 1372 and 1376 mpffl
Zone 3 ft lhe skpaga between 1366 and 1372 mamsl Zone 4 ix lhe storage between 1362 and 1366 iwamil Zona 5 ft ihe xioiage berween 1355 and 1362 marnH and Che Zona F5 4 Lne SlOiage between mmwrujiri opariaimg pool Qi 1353 mamil and 1366 mamsl TM bve storages al any level m 1*4 ianukilion 15 gross via* age
■1 lhe level minus 1hf giu-ts sloraga al i 353 mams!Arjo-Dedtssa IlydJ-tip&wcr & irtljauon Project
MBtearoloElcaJ & Hydrological Feasibility Studies
Annex me R 7 conLd
June 2009
Year and
Month
1963 64 Sep 1963 64 Oct 1963-64 Nov 1963-64 Dec 1963 64 Jan 1963-64 Feb 1963-64 Mar 1963 64 Apr 1963-64 May 1963-64 Jun
1 963-64 Jul 1963- 64 Aug Mean
1 WiW Sep 1964-     65 Oct
Starling Stoage
Mcum. 2596 2566 2586 2505 2525 2356 2197 2041 1912
Inflow      Slurage 1
lirigalw
lequiremenl
MGum       Meum         Mcum 623          3309                 12 224          2610                14
112          269B                   3
97          2603                  16
a          2533                 29
24           23M                35
18          221S                26
24          2065                    5        2060
Silage 2 Ml um
3197
2796
2695 2867 2504 2345 2169
1769 2282
2268.25 2566
im         167            1960                32
42          1954                    2
670 2439 9
784 3056 10
1952
1978
2430
3056
Rescrvon
Zone
1 1 1
1
2 2 2 2
3 3 2
1
1964      -66 Nov 1964 65 Det 1964-65 Jan 1964-65 Feb 196465 Mar 1964^65 apr 1964-65 May 1964-65 Jun 1964-65 Jul
1964 65 Aug Mean
2586
2586
2506
2470
2326
2159
1996
1867
1727
1659
2034
705 621 307
47
33 16 11 35 21
122 533 634
2215.083
3291 3207 7893 2628 2503 234? 2170 7031 tm 1049 2191 2660
12      3279 14      3193
3      2890 16     2612 29      2474 35      2307 25      7144
5      2026
32 2    11 80 B176
0      2102
10      7658
Power
<efease
Mcum
147
142 142 142 148 148 140 140 159 159 148 142
147 33 142 142 142 142 148 140 148 159 159 159 148 142
140 25
Storage 3 Mcum
3055 2654 2553 2525 2356 2197
7041 1912 1793 1709 2782 2914 3137 3051 "2748
2470 2326 2159 1090 1867 1727 1650 2034 2616
Mean Level m
1376 1370 1376 1376 1374 1374 1374 1374 1370 1370 1374 1370 1376 1376 1376 1378 1374 1374 1374 1370 1370 1370 1374 1376
lead        Power ni            MW
59   23 79352 59   23 79352
59    23 793S2
59   23 79352
57   23 95824
57    23 95824
57    23 95824
57   73 95024
53   23 93260
53    23 93260
57    23 95024
59   23 79352 57.17    23.8853$
59   23 79352
59   23 79352
59   23 79352
59   23 79352
57   23 95024
57    23 95024
57    23 95824
53    23 93268 53    23 93260 53    ?3 93260
E nergy
GWhi
17 13133
17 13133
17 13133
17 13133
17 24993
17 24993
17 24993
17 24993
17 23153
17 23153
17 24993
17 13133
206.3894
17 13133
17 13133
17 13133
17 13133
17 24993
1 1 7 7224499993J 1? 23153 1 17 72233115533
59   23 79352 56 83   73 8843?
57   23 95824    1 ? 24993
17 13133
206 351
Mcu-m      M Ecundm Surpfuj.
Storage
469         2500
68         2586
-33         2586
’61         2525
230         2356
■309         2197
■545        2041
-674         1912
-793         1793
■017         1769
•304         2202
328         2506
551         2586
465         2586
162         2580
-116         2470
-260         2326
-427         2159
-500         1996
-719         1067
859         1727
-928         1658
5$?         2034
-70         2516
UJnfnr ttJn^L^ n„„=Arjo Dedeisa Hydropower 4 Irrigation Project Meteorological 4 Hydrologicai Feasibility Studies
June 2009
Yea* and
Starting
Storage Inflow
Month          Mcum      Mcum 1965-66 Sep          2516        410 1965-66 Oet           2500        574 1965-66 Nov          2586        195 1965-67 Dec          2556          95 1965-68 Jan           2523          42
1965-66 Feb          2388          40
1965-66 Mar          2245          40
1965-68 Api           2111          54
1965-66 May          2012          47
1965-66 jw            1909        134
1965-66 Jul            1652        545
1965 66 Aug          2243        655
Mean               2296 417
lingalKSH
Stoiage 1 requirement Sloogc
Me um Mcum 2 Me um 2926 12 2914 3160 14 3146
2?01
3        2778
2001 16 2665
2565 29 7536
2428 35 2393
2285 26 2259
2165 5 2160
2059 2 2057
2043                32        2011
2400                   9        2391
2596                 10        2888
Powei
Reiervoir    rataue    Storage 3 Zone        Mcum       Mcum
1          14?          2772 1           142          3004 1           142          2636 1          142          2523 2          148         2385 2          148         2245 2          140         2111
2
2
3
2
1
148
2012
1374
148
1909
1374
159
1652
1370
140
2243
1374
142
2746
1376
Mean        Head       Powe* level m         m             MW
1376           59   23 79357
1376           59   23 79352
1376           59   23 79352
1376           59   23 79352
1374           57   23 95024
1374           57   23 95524
1374           57    23 95824
57   23 95824
67   23 95824
53   23 93268 57   23 95024 59   23 79352
57 50   23 68532
Energy       Suiplus
Fnd
Storage
146 42
Power
GWhr         Mcum       Mcum 17 13133           186         2506 17 13133           410         2586 17 13133             50         2566 17 13133             43         2523
17 24993          -198         2388
17 24993 ■341 2245
17 24993          -475         2111
17 24993 474 2012
17 24993          -677         1909
17 23153          -734         1853
17 24993         ■343         2243
17 13133           160         2586
706 3576
Year and
Starling
Storage Inflow Storage 1
Irrigation
requ*emeni Storage Reseiww
re'ease    Storage 3     Mean
Month          Mcum      Mcum      Mcum          Mcum       2 Mcum       2one        Mcum       Mcum     L evel m 196467 Sep           2586        726          3312                 12         3300                1          142          3158         1376
196467 Oct 2586 49 2635
1966 67 Nov 3479 25 2504
14 2621 1 142 2479 1376
3        2501                2          148          2353         1374
1965-67 Dec 2353 12 2 146 2201 1374
1966 87 Jan 2201 7 2 140 2031 1374
1966-6? Feb 2031 5 3 159 1842 1370
196467 Mar 1842 16 3 159 1673 1370
1988-676 Apr         1370          15                                                                        4           176          1204         1365
1966-67 May          1204          19                                                                        4          176          1045         1365
1966-6 7 jun           1D45          62                                                                        4           176            919         1365
1966 87 Jul              919        453                                                                        4           176          1187         1365
1966 67 Aug          1107         764                                                                                  3          159          1702         1370
2365
16
2349
2208
29
2179
2036
35
2001
1858
26
1832
1385
5
1300
1223
2
1221
1127
32
1095
1372
9
1363
1951
10
1941
Mean               1810 917
159 00  ■i
Head        Power        Energy      Surplus m            MW’             GWhr        Mcum
59    23 79352    17 13133           572
59    23 79352     1713133         -107
57    23 95024    17 24993        ■233
57   23 95824     17 24993         -305
57    23 95624     17 24993         -555
53   23 93268     17 23153       ■ 744
53   23 93260     17 23153         -913
48   23 99232     17 27447       -1302
4B   23 99232    17 27447        1641
48    23 99232     17 27447       ■1667
48    23 9923?     17 27447       -1399 53    23 93266     17 23153         -804
S3 33   23 93576    206 8049
End Storage Mcum
2586
2479
2353 ??O1 2031 1842 1370
1204
1045 919
1187
1782
Water Works Design & Supervision Enterprise
In Association with Intercontinental Consultants and Technocrats Pvt Ltd
19Arjo-Uedem Hydropower A lrrt(*Oon PTOjeet
Meteorological 4 Hydrological FeaglbHIty Studies
June 2009
Year and
Month
Sorting
Stooge
Mcum
Inflow
Mcum
Slorage 1
Mcum
Irrigation
requirement
Mcum
Sir* age
2 Mcum
Reservoir
Zone
Power
release
Mcum
Slorage 3
Mcum
Mean
level m
Head
m
Powei
MW
Energy
GWhr
Surplus
MCum
End
Storage
Mcum
1A07 60 Sep          1782        720         2502
12        2490               2          148         2342         1374          57   23 9S824    17 24993          -244         2342
1967-6B Oct          2342        685          3027                14        3013               1          142         2071         1376           59   23 79352    17 13133           285         2586
1967-6B Nov          2536        401          2987
3        2984               1          142          2842         1376           59   23 79352    17 13133           256         2596
1967.66 Dftr
2586
120
2706
16
2690
1
142
2548
1376
59
23 79352
17 13133
■38
2548
1967-60 Jan
26*8
19
256?
29
2538
2
148
2390
1374
57
23 95824
17 24993
-196
2390
1967^68 reb
2390
13
2403
35
2368
2
148
2220
1374
57
23 95B24
17 24993
366
2220
1967-63 Mar
2220
13
2233
26
2207
2
148
2059
1374
57
23 95824
17 24993
-527
2059
1967-68 Apr
2059
17
2076
5
2071
2
148
1923
1374
57
23 95024
17 24993
-663
1923
1967 60 May
1923
38
1961
2
1959
3
159
1000
1370
53
23 93268
17 23153
-706
1800
1967-68 jun
1800
117
1917
32
1885
3
159
1726
1370
53
23 93268
17 23153
■860
1726
1967-60 Jul
1726
305
2031
9
2022
3
159
1063
1370
53
23 93260
17 23153
-723
1863
1967-68 Aug
1863
469
2332
10
2322
2
148
2174
1374
57
23 95824
17 24993
-412
2174
Mean
21 S3 OM
148.25
56 5
23.91067
206.5882
2586
196869 Sep
2174
400
2574
12
2562
2
148
2414
1374
57
23 95824
17 24993
-172
2414
1968-69 Od
2414
222
2636
14
2622
1
142
2480
1376
59
23 79352
17 13133
-106
2480
1968 69 Nov
2480
78
2558
3
2555
2
148
2407
1374
57
23 95824
17 24993
-179
2407
1963-69 Dec
2407
34
2441
16
2425
2
148
2277
1374
57
23 95824
17 24993
-309
2277
1968 69 Jan
2277
30
2307
29
2278
2
146
2130
1374
57
23 95824
17 24993
■456
2130
1960-69 Feb
2130
30
2160
35
2125
2
140
1977
1374
57
23 95624
17 24993
■609
1977
1968-69 Mar
1977
46
2023
26
1997
3
159
1838
1370
53
23 93268
17 23153
-748
1830
1968-69 Api
1830
29
1867
5
1862
3
159
1703
1370
53
23 93268
17 23153
-603
1703
1968 69 May
1703
56
1759
2
1757
3
159
1598
1370
53
23 93268
17 23153
-988
1598
1968 69 jun
1598
254
1852
32
1820
3
159
1661
1370
53
23 93268
17 23153
925
1661
1968-69 Jul
1661
607
2268
9
2259
2
140
2111
1374
57
23 95824
17 24993
1968-69 Aug
2111
857
-475
2968
10
2111
2958
1
142
2816
1376
59
23 79352
Mean
2064 167
17 13133
230
2506
150 67
56 00
23 92227
206 6804
Water Works Design 4 Supervision Enterprise
Id Association with Intercontinental Consultants and Tecbnocrals Pvt Ltd
20■T
Meteorological & Hydrological Feasibility Studies
June 2009
Starling
Year and Month
1969-70  Sep 1969 70- Oct 1969 70 Nov 1969 70- Oec 1«9  70-  Jan 1969-70-Feb 1969-70- Mar 1909-70- Apr 1969-70 May 1969-7Q. Jun 1969-70- Jul
Storage Mcum
2586 2588 2586 2495 2357 2200 2022 1846 1706 1579 1597
Imgatron
requirement
Mcum
Siprage Reservoir
12
2 Mcum 3139
7one
14       2746 3        2637
16       2505 29        2348
Power release
Mcum 142 142
storage 3 Mcum
2997 2604
142  ■ I            2495
35
2170
26        2005
5
2
32
1865
1738
1756
1969-     70- Aug
2022
Mean
1970- 71 Sep 1970 71 Oct 1970-71 Nov 1970-71 Dec 1970*71 Jan 1970 71 Feb 1970-71 Mar 1970-71 Apr 1970-71 May 1970-71 Jun 1970-71 Jul 1970-71Aug Mean
2131 833 2506 2586 2551 2516 2387 2232 2059 1893 1738 1618 1002 1971
2130 25
Inflow Mcum
565
174 54 26 20
5 9
24 34
209 593 036 673 121 110
35 22 10
7 9
41 175 526 709
S'wage 1 Mcum
3151 2760 2640 2521 2377 2205 2031 1870 1740 1788 2190 2658 3179 2707 2661 2551 2409 2242 2066 1902 1779 1793 2128 2680
9 2181
10 2648
12
3167
14       2693
3
2658
16        2535
29 35 26
5 2 32
9
2380
2207
7040
1897
1777
1761
2119
10        2670
1
1
1
2
2
2
3
3
3
3
3
1
1
1
1
2
2
2
2
3
3
3
2
1
148 148 148 159 159 159 159 159 142
150.58
142 142 142 148 148 148 147 159 159 159 148 14?
148 67
2357
2200
2022
1846
1706
1579
1597
2022
2506
3025
2551
2516
2387
2232
2059
1B93
1738
1618
1002
1971
2528
Mean
level m
1376 1376 1376 1374 1374 1374 1370 1370 1370 1370 1370 1376
137 3 00
1376 1376 1376 1374 1374 1374 1374 1370 1370 1370 1374 1370
1373 67
Head
m 59 59 59 57 57 57 53 53 53 53 53 59
58.00 59 59 59 57 57 57 57
53 53 53 57 59
56 67
Power MW
23 79352
23 79352
23 79352
23 95824
23 95624 23 95824
23 93268
23 93268
23 93268
23 93268
23 93208 23 79352
2389
23 79352
23 79352
23 79352
23 95824
23 95824
23 95824
23 79636
23 93268
23 93268
23 93268
23 95824
23 79352 23 88
Energy GWhr
17 13133
17 13133
17 13133
17 24993
17 24993
17 24993
17 23153
17 23153
17 23153
1723153 17 23153 17 13133
206 43 1713133
17 13133
17 13133
17 24993
17 24993
17 24993
1713338
17 23153
17 23153
17 23153
17 24993
17 13133 206 35
Surplus Mc.um
411
18 91
229 -386
564
■740 -880
-100?
■989 564
■80 439
■35
•70
■199 354 -527 -693 -848
968 -984 ■615
56
End Storage
Mcum 2586 2586 2495 7357
2200
2022 1646
1706
1579
1597
2022 2506 2586 2551 2516
2387
2232
2059
1893
1738
1618
1602
1971 2586
21J
Arjo Dedesu Hydropower & Irritation Project Meteorological & Hydrological Feasibility Studies
Jane 2
009
Year and
Monlh
Starhftj
Storage
Mcum
Irrigation
Inflow Storage 1 reqv*emenl Storage Reservoir
Mcum Mr urn Mcum 2 Mcum Zone
Powei
release St
orage 3
Mean
Mcum
Mcum 1
Leve‘4 m
Head
m
Power
MW
Energy I GWhr
Surplus
Mcum
End
Storage
Mcum
1®71 72 Sep
2606
568
3154
1?
3142
1
142
3000
1376
1971 72 (kJ
2586
450
3036
14
3022
1
142
2880
1376
1971-72 Nov
2566
185
2771
3
2766
1
142
2626
1376
1971-72 Dec
2586
60
2546
16
1
142
2488
1376
1971-72 Jan
2488
31
2519
29
2490
2
146
2342
1374
1971-72 Feb
2342
19
2361
35
2326
2
146
2178
1374
1971-72 Ma'
2170
13
2191
26
2165
2
148
2017
1374
1971-72 Apr
2017
26
2043
5
2038
2
148
1890
1374
1971-72 May
1090
43
1933
2
1931
3
159
177?
1370
1971-72 Jun
1772
86
185B
32
1626
3
159
1667
1370
1971-72 Jul
1667
513
21B0
9
2171
2
148
2023
1374
1971-72 Aug
2023
746
2769
10
2759
1
142
2617
1376
Mean
2226 75
Storting
147 33
1374 17
Irrigation
Power
Year and       Storage     info*      Storage 1 requirement    Storage Reservoir
release
Silage 3
Mean
Month
Mcum
Mcum
Mcum
Mcum
2 Mcum
7c^e
Mcum
Mcum
I   Level m
1973 73 Sep
25B6
430
3016
12
3004
1
142
2662
1376
1972 73 Oct
2506
125
2711
14
2697
1
142
2555
1376
1072-73 Novp
2550
71
2626
3
2623
1
14?
2401
1376
59   23 79352    17 13133         414         2586
59   23 79352    17 13133         294         2586
59   23 79352    17 13133           40        2586
SO  23 79352    17 13133          -98        2468
57   23 95824   17 24993        -244        2342
57   23 95824    17 24993        •408        2178
57   23 95824    17 24993        -569        2017
57   23 95824    17 24993        -696        1890
53   23 9326B   17 23153        -814        1772
53   23 93268   17 23153        •919        1667
57   23 95824    17 24993        -563        2023
59   23 79352   17 13133           31        2566
57 17         23 69       206 37
Er-0 Head       Power        Energy Surplus Stooge
m            MW          GWhr       Mcum      Mcum 59   23 79362   17 13133         276        2566 59   23 79352    17 13133           31        2555
59   23 79352    17 13133        -105        2481
1972-73 Dec
2461
30
2511
16
2495
2
148
2347
1374
57   23 95824    17 24993
239
2347
1972-73 Jan
2347
15
2362
29
2333
2
148
2185
1374
57   23 95824    17 24993
-401
2185
1972-73 Feb
2185
7
2192
35
2157
2
140
2009
1374
57   23 95824    17 24993
-57?
2009
1972-73 Mar
2009
3
2012
26
1906
3
159
1827
1370
53   23 93268    17 23153
■759
1827
1972-73 Apr
1827
5
1832
5
1627
3
159
1688
1370
53   23 93268   17 23153
■918
1660
1972-73 Mary
1600
03
1751
2
1749
3
159
1590
1370
53
23 9326ft
17 23153
-996
1590
1972-73 Jun
1590
187
1777
32
1740
3
159
1506
13?0
53
23 93268
17 23153
-10QO
1586
1972-73 Jul
1585
156
1742
9
1733
3
159
1074
1370
53
23 93268
17 23153
-1012
1574
1972-73 Aug
1574
633
2207
W
2197
2
148
2049
1374
57
23 95624
17 24993
-537
2049
Mean
2082 833
151 08
1372 83
55 83
23 91
206 55
Water Works Design & Supervision Enterprise
In Association with Iniercontinental Consultants and Ttchnorrats Pvt LtdXFflf DedesB*                 st Tilrlf iticmPniJefT Meteorological & Hydrologicfl-L Feasibility Studies
June 2009
Year and
Month
Starling
Storage
Mcum
Irrigation
inflow S Mtum
itexage i n
cqirHement
Storage R
Mcvm
Mr uni
2 Mcum
eservo.i Zone
Power release S
Mr.um
torage 3
Mrum
Mean
1 evel m
H-ead
m
P-ciwei
MW
Energy J GWhi
Surplus
Mrum
End.
Slarage
Meufii
107 3 74 Seo
2049
63#
2063
12
2076
1
17 13133
140
2S86
1973 74 Oct
2566
355
2941
14
2927
1
17 13133
199
2£>S6
1973-74 ‘•■J-r.iV
25B6-
90
2676
3
2673
1
17 13133
-55
2531
19?3 74 Dec
2531
37
2&G-8
16
2542
2
17 24993
-162
24CJ4
1973-74 Jan
2404
22
2426
29
2397
2
142         2734           1376           59    23 794
142         2765         1376           59    23 794
142         2531         1376           59    23 794
140           2404         1374           57    23 956
146 2249 1374 57 23 95fl
17 24993
■337
2249
2269
35
2224
2
1973 74 Feb         2249         10                                                                                   140         2076         1374           57    23 95B
17 24993
540
2076
1973-74 Mai 2076 10
1973-74 Apr 1&12 7
2066
26
2060
2
146
1912
1374
17 24993
-074
1912
1919
5
1914
3
159
1973 74 May
1755
71
1028
2
1624
3
1665
57    23 966
53    23 933
53    2 3 933
S3     23 933
146           1fil7         1374           57     23 958
142 2536 1376 59 23 794
1755
1370
17 23153
-631
1755
159
1370
17 23153
-921
1665
1073 -74 Jun
1665
190
1065
32
1023
3
159
1664
1370
17 231S3
2074
922
1664
1973-74 Jul
1664
410
9
2065
2
17 24993
669
1973-74 Aug
1917
771
26SB
10
2670
1917
1
1713133
-50
2536
Mean
2116 167
56 667       23 90
206 47
Irrigation
Year and
Month
1974-75 Sep
19*74-75 Oct
1974 75 Nom
1974-75 Dec 
Starling Storage
Mcum 2535 2570 J5«
?4?7
inflow Mcum
196 04
72
26
Storage 1 requirement   Storage Reservoir
140 75
Power
release Storage 3 Mean Mcum Mcum Level m
End
Mcum Mcum
2 Mcum Zone
2732
12
2720
Energy Surplus Storage GWh<        Mcum       Mcum
2662
14
2646
17 13133
a         2576
2570
3
2575
2455
16
1974-75 Jan
2439
16
2309
29
1974-75FeO
2200
12
2144
1974.75 Mar
35
13
2109
1974
1974.75 Apr
26
1940
17
1BD6
1974-75 May 
5
1001
35
1077
1974 75 Jun
2291
2132
1961
1769
1642
1516
1439
1566
114
2
1675
1974-75 Jul
1630
32
297
1590
1974-75 Aug
1736
9
456
2024
1727
Mean
2032 053
10
2014
142          2578         1376 142         2506         1376
146         2427         1374
140         2291         1374
140         213?         1374
140         1961         1374
159          1789         1370
159          1642         1370
159          1516         1370
159          1439         1370
159          1580         1370
159 152 SO
1855         1370
Head Power
m          MW
S9    23 794
59    23 794
57    23 958
57    23 950
57    23 950
57     23 956
53     23 933
53     23 933
53     23 933
53     23 933
S3     23 933
53     23 933
55 33       23 92
17 13133            -00         2506
17 24993           -159         2427
17 24993          -295         2291
17 24993          -454          2132
17 24993 •625 1961
17 23153          -797         1709
17 23153          -944         1642
17 53153 ■1070 1516
17 23153        -1147         1439
17 23153        -1018          1568
17 23153
296 6515
-731          1855
Water Works Design 4 Snptnlslon Enterprise
Id AssMiaUgo with toHrcooUsemal Cmliuui and Technocrat Pn Ltd1
ArJ^Dedessa  Hydropower! lrrl gatlonVroj ect Meteorological & Hydrologtcil Feasibility Studies
June 2009
Yeat and
Starling
Storage Inflow
Stoiage 1
Irrigation requirement    Storage
Monlh          Mcum      Mount 1975-76 Sep          1855        389
1975-76 Oc1 2084 216
1975-70 Nov 2138 75
Mcum          Mcum       2 Mr.um 2244                 12        2232
2300                 14         2286
7213                   3        2210
Power
Reservoir   release  Slew age 3 Zone        Mcum        Mtum
2           148         2084 2          148         2130
3          148          2062
Mean       Head      Power level m         m          MW
1374           57    23 956
1374          57    23 958
1374          57     23 958
Energy      Surplus
End
Storage
GWhi         Mcum       Mcum
17 24993          -502         2084
17 24993          -448         2136
1 7 24993 524 2062
1975 76 Dec
2062
33
2095
16
2079
2
148
1931
1374
57
23 958
17 24993
-655
1931
1975-76 Jen
1931
23
1954
29
1925
3
159
1766
1370
53
23 933
17 23153
-820
1766
1975-76 Feb
1766
15
1781
35
1746
3
159
1587
1370
53
23 933
17 23153
*999
1587
1975-76 Mai
1587
16
1603
26
157?
3
159
1418
1370
53
23 933
1? 23153
-1166
1418
1975-76 Ap<
me
21
1439
5
1434
4
176
1258
1365
48
23 992
17 27447
■1328
1258
1975-76 May
1258
44
1302
2
1300
4
176
1124
1365
48
23 992
17 27447
-1462
1124
1975-76Jun
1124
142
1266
32
1234
4
176
1058
1365
48
23 992
17 27447
-1528
1058
1975-76 Jul
1058
371
1429
9
1420
4
176
1244
1365
48
23 992
17 27447
’134?
1244
1975 76 Aug
1244
570
1814
10
1804
3
159
16100
1645
1370
53
23 933
1723153
-94!
187?
Mean
1627 063
52 67
23 96
207 0237
Year and
Starling
Storage Into* Slorage 1
irrigation
lefluiremenl Slcwage Reservoir
Power
release Storage 3 Mean Head Powei Energy Surplus
End
Storage
Month
Mcum
Meum
Mcum
Mcum
2 Mcum
2erne
Mcum
Mcum
Level m
m
MW
GWhr
Mcum
Mcum
1976-77 Sep
1872
486
2358
12
2346
2
146
2198
1374
57
23 950
17 24993
■186
2198
1976 77Oclp
2198
270
2468
14
2454
3
159
2295
1370
53
23 933
17 23153
1976-77 Nov
2295
94
2389
291
3
2295
2366
2
148
2238
1374
57
21 958
17 24993
348
1976-77 Dec
2238
42
2280
16
2238
2264
2
148
2116
1374
57
1976-77 Jan
23 950
17 24993
2116
26
2142
-470
2116
29
2113
2
148
1965
1374
57
17 24993
1976-77 Feb
1965
1?
1982
23 958
-621
35
1965
1947
3
159
1786
1976-77 Maj
18
1370
53
23 933
17 23153
-798
1788
1006
26
1760
1788
3
159
23
1621
1370
1976-77 Apr
1621
53
23 933
1644
5
17 23153
965
1639
1621
1460
3
159
1480
1976-77 May
50
1370
53
1630
23 933
2
1528
17 23153
-1106
1480
1976-77 Jun
3
159
1369
163
1369
1370
1532
53
23 933
17 23153
32
-1217
1500
4
1369
1976-77 JU
1324
4?4
176
1324
1740
1365
48
23 992
9
1739
17 27447
■1252
1324
1976-77 Aug
1580
3
159
651
1580
2231
1370
S3
10
23 933
17 23153
2221
2
■1006
148
2073
1374
57
1580
Mean
1820 5
23 950
17 24993
-513
155 83
2073
54 25
23 95
20*5 9133
Water Works Design & Supervision Enterprise
Ip Association with IntercontinenUl Consultants and Technocrats Pvt. Ltd
24—
I —               —
Ar]«j Dedessa Hydropower 4 Irrigation Project
Metaorologlcal & Hydrological FeaiHrtlity Studies
—        —       —.        —            -
June M)O9
Year and
Starting
Storage
Il 1101m Irrfkrw Storage 1 requiremenl
Power
Storage Retervoir release Storage 3                   Mean      Head Power
End
E nergry Su<p1u» Storage
Montn         Mcum     Meuro     Mcum         Mcum       2 Mcum      Zone       Mcum      MtAjm Level m           Hl
MW
GWhr
Mcum
Mcum
1977 7ft Sep 2073 556 1977 76 Oct 2475 309 1977-78 Nov 3506 10?
1977 70 Dec         2 M3          40
1977-70 Jan 2437 21
1977 70 Feb         2271          14
1977-78 Mar         2102          15
1977-7A Api          1943          19
1977-76May         179B          40
1977-70 Jun         1677        126
1977-70 Jul           1614       334
1977 78 Aug         1700       513
Mean                2107 42 Starling
2629
12
2617
1
142
2475
1376
59    23 794
17 13133
-111
2475
2764
14
2770
1
142
2626
1370
59   23 794
17 13133
42
2566
2666
3
3605
1
142
2543
1376
59   23 794
17 13133
-43
2543
2591
16
2575
2
148
2427
1374
57    23 956
17 24993
-159
2427
2440
29
2419
2
146
2271
1374
57    23 956
17 24993
-315
2271
2265
35
2250
2
148
2102
1374
57    23 956
17 24993
-404
2102
2117
26
2091
2
146
1943
1374
57    23 958
17 24993
643
1943
IMS
5
1957
3
159
1798
1370
53    23 933
17 23153
^788
1796
1636
2
U36
3
159
1677
1370
53    23 933
17 23153
■909
1677
1005
32
1773
3
159
1814
1370
53    23 933
17 23153
-972
1614
1940
9
1939
3
159
1700
1370
53    23 933
17 23153
-606
1700
2293
10
2263
2
140
2135
1374
57    23 950
17 24993
■451
2135
150 17
5617      23 91
206 5698
IntgMm
P™«i
End
Year *nd      Storage    Infl™    Storage 1 teqiwemenl 1 Storage Reeervw ■  rt*M« Stoi age 3         Mean      IHead Powei          Energy Surplut Storage
Mpnlh         Mcum      Mcun       Mcum         Mcum       2 Mcum      ?onc        Meuro      Mcum Level m           m          MW        GWhr       Mcum 1    Mc-am
1978-79 Sep 2135 437
19A8-790cl 241? 243
1978-79 Nov 2499 85
1978-79 Dec 2433 38
1978-79Jan 2307 10 1978 79feb 2140 8
1978 79 Mar          1965           7
1978-79 AjH           1707         17
1970-79 May         1640          35
1970-79 Jun          1514         94
2572
12        2560
2
146
2412
1374
2655
14        2641
1
142
2499
1370
2564
3       2561
2
146
2433
1374
2471
16
2455
2
146
2307
1374
2317
29
2266
2
146
2140
1374
2146
36
2113
2
148
1965
1374
1972
26
1946
3
159
1787
1370
1004
6
1799
3
159
1640
1370
1675
2
1673
3
159
1514
1370
1600
32
1576
3
159
1417
13?0
1978-79 1978 79 Aug Mean
1417       341
175S
9
1749
3
159
1590
1370
1590 1966 563
57    23 958   17 24993        -174        2412
59   23 794    17 13133          -87        2499
57 23 956 17 24993 153 2433 57 23 958 17 24993 -279 23D7
57    23 958   17 24993        -446        2140
57 23 958 17 24993 621 1965 53 23 933 17 23153 •799 1707
53    23 933   17 23153        -946        1640
53    23 933   17 23153      -1072        1514
53    23 933   17 23153       1169        1417
53    23 933    17 23153        -996        1590
498
2066
10
2070
2
140
1930
1374
57     23958   17 24993
656        1930
152 083
55 50      23 93
206 7886
Water Works Design & Supervision Enterprise
In Association with lntercootinental Consultants and Technocrats Pvt Ltd
25Arjt^Dedessa Hydropower tlrrlEaUon'project Meteorological i Hydrological Feasibility Studies
litigation
fear
sM
Sorting
Stooge
End
Inflow    Storage i
requirement  Storage   Reservoir
Pu^ef
release Storage 3 Mean
Mo
nlh
1978-
80
Sep
1979-
80
Ocl
Mcum 1930 2185
Mcum      Mcum         Mcum       2 Mcum       Zone        Mcum       Mcum     Level m
2336
12
2313
2
2382
14
2368
2
1979 80 Nov 1979*80 Dec 1979 BO Jan 1979 BO Fab 1979-00 Mar 1979 80 Apr 1979-80 May 1979-80 Jun
0
1979 80 Aug Me»n
2220 2146 2016 1B46 1664 149? 1365 1222 1127 1236
1702 417
2297
3
2294
2
2150
16
2164
2
2034
29
2005
3
1858
35
1B73
3
145          2165        1374
145         2220        1374
145         2146        1374
148         2016        1374
159 1546 1370
159 1664 1370
1677
76
1651
3
159
1492
1370
1509
5
2
1396
4
1365
1335
32
1303
4
395
217
77
34
18
12
13
17
36
113
294
454 1690 10 1650 3
1504
4
176
1325
1365
1400
176
1222
176
1127
1365
1421
9
1412
4
176
1236
1365
159
1521
1370
Head        Power        Energy         Surplus      Storage m             MW           GWhr        Mcum       Mcum
57    23 958    17 74993         -421         2165
57    23 956    17 24993         -366         2222
57    23 956    17 24993         -440         2146
57    23 958    17 24993         -570         2016
S3 23 933 17 23153 -740 1B46 53 23 933 17 23153 922 1664
53    23 933    17 23153       -1094         1492
45     23 992    17 27447       -1258         1365
48    23 992    17 27447      ■1364         1222
48    23 992    17 27447       -1459         1127
48    23 992    17 27447       ”1350         1236
53    23 933    17 23153        1065        1521
52 67      23 96   207 0237
Irrigation
Year and
Slaving
Storage
Head      Po*«r       Energy     Surplus
End
Stew age
Month
Mcum
1980 81 Sep
1521
2266
12
2254
2
1980-81 Od
2106
2145
16
1980-81 Jan
1981
1980 81 Feta
1841
Inflow   Storage 1 r eq u if e mend Mcum      Mcum         Mcum
745 236
63 53 48 28 30 26 41 39
413 633
2342
14
1980-81 Nov
2180
2243
3
1980-81 Dec
2092
2029
29
1869
35
161
Power
Storage   Reservoir     release •Storage 3    Mean
2 Mcum       Zone        Mcum       Mcum      level m
146         2106        1374
148      ** 2180         1374
148         2092         1374
148         1981         1374
159         1841         1370
159         1675         1370
2328
2
2240
2
2129
2
20CO
3
1834
3
1980-81 Mac
1675
ITO
26
1679
3
159
1520
1370
1980-81 Apr
1520
1546
5
1541
3
159
1382
1370
1980-81 May
1382
1423
2
1421
4
176
1245
1980-61 Jun
1245
1365
1284
32
1252
4
176
1076
1365
I960 81 Jui
1076
1489
9
1480
4
176
1304
1980-81 Aug
1365
1304
1937
to
1927
Mean
3
159
1660 25
1768
1370
159 58
Water Works Design & Supervision Enterprise
m          MW          GWhr        Mcum       Mcum 57    23 95$    17 24993         -480         2106
57    23 956    17 24993         -406         2180
57    23 958    17 24993         -494         2092
57    23 95$    17 24993          605         1961
53    23 933    17 23153         -745         1841
53    23 933    17 23153        -911         1675
53    23 933    17 23153       *1066         1520
53    23 933    17 23153       -1204         1382
48    23 992    17 27447       -1341         1245
48    23 992    17 27447       -1510         1076
48    23 992   17 2744 7       -1282         1304
53    23 933    17 23153          818         1768
53 08      23 96    206 9608
26
tn Association with Intercontinental Consultants and Technocrats Pvt. LidArjo Dedwsa Hydropower A Irrigation Project
Meteorological & Hydrological Feasibility Studies
Year and Month
1081-82 Sep 1981-82 Oct 1881-82 Nov 1061-87 Dec 1981-82 Jan 198V82F«b 1981-82 Mai 1981-82 Apr 1981 82 May 1981-62 Jun 198182   Jul 1961 82 Aug
Mean
Starling Storage
Mcum 1768 2149 2302 2171 2038 1889 1714 1649 1399 1256 1228 1512
1747 25
Irrigation
into* Sinrage 1 requaemem Storage Rewrvo*
June 2009
Power
telease Storage 3 Mean
End
Mcum
Mcum
Mcum
2 Mcum
Zone
Mcum
Mcum 1
Level m
541
315
12
229?
2
146
2149
1374
2464
14
2450
2
140
2302
1374
20
2322
3
2319
2178
2
140
2171
1374
7
2178
2
148
2030
1374
36
2066
29
2037
2
146
1009
1374
19
1906
35
1673
3
159
1714
1370
20
1734
26
1708
3
159
1549
1370
14
1563
5
1656
3
159
1399
1370
35
1434
2
1432
4
176
1256
1365
160
1436
32
1404
4
176
1220
1365
452 16B0
571 2063
9       1671 10        2073
Irrigation
3          159 2          14B
156 33 Power
1512 1370
1925 1374
Head     Power      Energy !    Surplus   Storage m          MW         GWht        Mcum      Mcum
57    93 958    17 24993        -437        2149
57    23 956   17 24993        -204        2302
57    23 958    17 24993        -416        2171
57    23 958    17 24993        -556         2030
57    23 956    1724993          6»7         1080
53    23 933   17 23153          672        1714 53    23 933   17 23153       1037        1549 53    23 933    17 23153     ^1107        1399
4B    23 992    17 27447      -1330        1256
40    23 992    17 27447      -1350        1226
53    23 933    17 23153     • 1074        1512
57    23 958   17 24993        -661         1925
54 17      23 96   206 9747
Year and Month
1982-83 Sep 1982-83 Oct 1982-83 Nov 1982-83 Dec 1982-83 Jan 1982-83 Feb 1982-83 Mar 1982 83 Apr 1982-83 May 1982-83 Jun 1982 83 Jul 1982 83 Aug Mean
Starting
Sto’age into*
Storage 1 requirement
Storage Reservoir release Storage 3            Mean          Head IPower
End
Energy Surplus Slorage
Mcum      Mcum      Mcum          Mcum       2 Mcum       2 One      Mcum       Mcum Level m            m          MW         GWhr       1Mcum      Mcum
1925        415          2340                12        2328               2          148         2180        1374          57    23 058   17 24993        -406        2100
2100
2400
2436
456
2636
14
2622
1
142
2480
1376
59   23 794   17 13133
• 106
2400
to?
2567
3
2584
2
148
2436
1374
57    23 950   17 24993
*150
2436
54
2490
16
2474
2
148
2326
1374
57    23 958   17 24993
-260
2325
2326
26
2352
29
2323
2
148
2175
1374
57    23 958    17 24993
-414
2175
2175
20
2195
35
2160
2
148
2012
1374
57    23 986   17 24993
-574
201?
2012
23
2035
26
2009
3
159
1B50
1370
53    23 933   17 23153
-736
1650
1650
17
1867
5
1862
3
159
1703
1370
53    23 933   17 23153
>063
1703
1703
40
1743
2
1741
3
159
1582
1370
53    23 933    17 23153
■1004
1502
1502
112
1694
32
1662
3
159
1503
1370
53    23 933    17 23153
•1083
1503
1503
361
1864
9
1855
3
159
1696
1370
53    23 933   1723153
■890
1696
1596        687          2383                 10        2373               2           148         2225        1374          57    23 958   17 24993       ■361         2225
1909
152 0B
58      23 93   206 7886
Water Works Design & Supervision Enterprise
Id Association with Intercontinental Consultants and Technocrats Pvt Ltd
27Arjc Eterteisa Hydropower t Lnitfilioa Project
Meteortiltigkal &Bydrolog!cal Feasibility Studies
June 2009
Starting
Irngahofi
Power
End
Year and
Month
1903 Si Sep
1903-54 On
198$. B4 Noy
1953 B4 DM
19B3-04 Jan
1903-84 FA
1983-84 Mar
2171
6
2179
26
2153
2
148
2005
1374
1903 84 Apr
2005
7
2012
5
2007
3
159
1548
1370
1903-04 May 
1648
22
1870
2
1869
3
159
1709
1370
1903 64 Juft
17OT
135
1844
32
1812
3
159
1653
1370
I5B3 M Jul
1653
449
2102
Slorage     Infow     Storage 1 requiramerrt  Storage   Reservoir   release   Storage 3     Mean       Head      Power      Energy     Surplus    Storage Mcum      Mcum      Mtum          Mcum       2 Mcum       Zone        Mcum       Mcum     l evel m        m          MW         GWhr        Mcum      Mcum
2225         we          2693                12        2861                1         142         2739        1376          59    23 794    17 13133         153        2586
2566        616          3204                14        3190               1          142         3048        1376          59    23 794    17 13133         462        2586
2566        233          2969                  3        2666               1          142         2724        1376          59    23 794    17 13133         130         2586
2586          69          2655                18        2639               1          142         2497        1376            »    23 794    17 13133          cgg        2497
2497          23          2520                29       2491               2          146         2343        1374          57    23 958   17 24993        -243        2343
2343          11          2354                 35        2319               2          148         2171         1374          57    23 958   17 24993          ^15        2171
57    23 958    17 24993        -561         2005
53    23 933   17 23153        -730        1848
53    23 933   17 23153         877         1709
53    23 933     1723153       ■933        1653
57    23 956   17 24993        -641         1945
57    23 958   17 24993        -398        2188
9
2093
2
148
1945
1374
1903 64 Aug
1945
401
TO
2336
2
148
2188
1374
Mean
148 75
56 67      23 90   206 4696
Year and
2179 5
Starting
Storage Inflow S1o*age i
Irrrg-alion
laqutefriem Storage Reservoir
Power
release J Storage 3 Mean Head Power Energy Surplus
0M
Storage
Month
Mcum
Mcum
Mcum
Mfvm
2 Mt uro
Zone
Mcum
Mcum
Level m
1954-05 Sep
1945
M4
2409
12
2477
2
146
2329
1374
1964.05 Oct
2329
300
2639
14
2615
1
142
2473
1376
1954 05 Ngv
2473
106
2579
3
2078
2
148
2420
1374
1954-05 Dec
2428
40
2474
16
2455
2
148
2310
1374
1954^0$ Jan
2310
35
2335
29
2306
2
148
2155
1374
1954-05 Fe&
2158
1?
2175
35
2140
2
148
1992
1374
1964-35 Mu
1992
IB
2010
26
1984
3
159
1825
1370
k9B4 35 Apr
1825
23
1540
5
1843
3
159
1604
1370
1904-35 May
1684
40
1732
2
1730
3
159
T5?1
1370
1904-55 Jun
1571
156
1727
32
1695
3
158
1536
1370
1904 35 JkMl
1536
406
1941
8
1932
3
159
177$
1370
1904-35 Aug
1773
526
2308
10
2309
2
148
2241
13?4i
Mean
2002
152 08
Waterworks Design & Supervision Enterprise
Id Association with tauntml!nfloial CoasulCiuLs and Ttcbiiocrais Fvt Lid
m          MW         G'Alht         Mtum       Mcum 57    23 958    17 24993        ■257        2329
59    23 794    17 1313$        -113        2473
57    23 958   17 24993        -150        2420
57    23 958    17 24993        -276        3310
57    23 958    17 24993        -428       21J.0
57    23 958    17 24993        -594       1992
53    23 933   17 2315$        -761         1825
53    23 933    17 23153         902        1684
53    23 933    17 23153      -1015        1571
53    23 933    17 23153      -1050        1536
53    23 933  17 231 S3        -813        1773
57    23 958    17 24993       -34,5        2241
55 50      23 93    206 7856
?KArjo Dedwst Hydropower & Irrigation Project
Meteorological & Hydrological Feasibility Studies
June 2009
Starting
irrigation
Power
End
2786
12
2774
1
2886
14
2872
1
2692
3
2689
1
2593
16
2577
2
2454
Year and       Storage     Inflow   Storage 1 iequiremen1  Sloe age Reservoir     release >I l(M age 3   Mean       Head     Power      Energy     Surplus    Storage
Month          Mcum      Mcum      Mcum         Mcum       2 Mcum      Zone       Mcum       Mcum     Level m       m          MW         GWm        Mcum      Mcum 1985-86 Sep          2241        545                                                                                   142         2632         1376          59    23 ?94    1713133             46        2506 1935 66 Oct           2586        300                                                                                   142         2730        1376          59    23 794    17 13133          144        2566
1985 86 Nov          2586        106                                                                                   142         2547         1376          59    23 794    17 13133           -39        2547
1985 -BGOec        25-47          46                                                                                   148         2429        1374          57    23 958    17 24993        -157        2329
1985-86 Jan 2429 25 148 2277 1374 57 23 958 17 24993 ■309 2277
29
2425
2
l965-06Feb            2277          17
1985-86 Mar          2111          18
1985 06 Api           1955          23
1985-86 May         1814          49
1985-86 Jun           1702        157
1985-86 Jul            1668        406
2294
35
2259
2
2129
26
2103
2
148
1955
1374
57    23 958    17 24993
631
1955
1978
5
1973
3
159
1814
1370
53    23 933    17 23153
■772
1014
1863
2
1861
3
159
1702
1370
53    23 933    1723153
1702
1827
3
2074
9
2065
2
148      « 2111         1374          57    23 958   17 24993         -475        7111
53    23 933    17 23153         -910        1668
57    23 958    17 24993         -669        1917
884
1859
32
159
1668
1370
148
1917
1374
1985 86 Aug Mean
1917 2152 75
148
626          2543                10        2533               2
149 25
2385
1374
57    23 958    17.24993
-201        2385
56 50     23 91
206 5842
Year and
Starling
Storage Inflow Storage i
Irrigation
requirement Storage Reservoir
Power
release Storages Mean Head Power
End
Energy Surplus Storage
Monto          Mcum      Mcum      Mcum         Mcum       2 Mcum       Zone        Mcum       Mcum     L evei m       m          MW         GWhr       Mcum      Mcum
1986-87 Sep 2385 656 142 2887 1376 59 23 794 17 131J3 301 2586
1986-87 Od 2586 361 142 2791 1376 59 23 794 17 13133 205 2586
3041
12
3029
1
2947
14
2933
1
2714
3
2711
1
142
2569
1376
2625
16
2609
1
142
2467
1376
2497
29
2466
2
148
2320
1374
2340
35
2305
2
148
2157
1374
2178
26
2152
2
148
2004
1374
2032
5
2027
3
159
1668
1370
1926
2
1924
1765
1370
159
1763
1370
148
2094
1374
142
19B6-87Nqv              2586        126
1986-67 Dec           2569          56
1906-67 Jan           246?          30
1986 67 Feb           2320          20
1986-87 Mai           2157          21
19B6-87 Apr           2004          28
19B6-87May           186B          58
1986-87 Jun           1765        189
1986-07 Jui            1763        488
1986-07 Aug          2094        754
Mean 2213 667 148 25
3
159
1954
32
1922
3
2251
9
2242
2
2848
10
2838
1
2696
1376
59    23 794    17 13133          -17        2569
59    23 794    17 13133        -119        2467
57    23 958    17 24993         -266        2320
57    23 958    17 24993         -429        2157
57    23 950    17 24993         sea      20C4
53    23 933    17 23153         -710        1868
53    23 933    17 23153        -021         1765
53    23 933    17 23153        823       1763
57    23 958    17 24993        •492         2094
59    23 794    1713133           110        2586
56 63      23 88      206 351
Water Works Design & Supervision Enterprise
In Association with lolercondneota) Consultants and Technocrats Pvt Ltd
29Arjo Dedeasi Hydropower 1 Lrrt jetton Project
Meteorological & Hydrological Feasibility Studies
June 2009
Year and
Monih
Starting
Storage
triigalion
Inflow J Storage 1 requirement Storage Reservoir
Power
release Storage 3 Mean
Mcum      'Meum
Mcum          Mtum        2 Mcurn       Zone        Mcum       Mcum
1 evei m
Head
m
Power
MW
f nefgy
GWhr
Surplus
Mi_um
End
Storage
Mcum
1067-00 Sep 2586 624 3210
1987 68 cm 2556 343 2929
12 3198 1 142 3056 1376 59 23 ?94 17 13133 470 2586
14 2915 1 142 2773 1376 59 23 794 17 13133 167 2586
1987-00 Nov
2586
122
2708
3
2705
i
132
2573
1376
59
22 H8
15 9249
13
2573
1907-88 Dec
2573
53
2626
15
2610
2
148
2462
1374
57
23 958
1 7 24993
124
2452
1987 00 Jan
2462
29
2491
29
2462
2
148
2314
1374
57
23 950
1 ? 24993
-272
2314
1907-BBFeb
23M
IB
2333
35
2290
2
146
2150
1374
57
23 950
17 24993
-436
2150
1967 08 Mar
2150
20
2170
26
2144
2
146
1996
1374
57
23 956
17 24993
-590
1996
1987-68 Apr
1996
20
2022
5
2017
3
159
1056
1370
53
23 933
17 23153
-720
1858
1987 80 May
1658
56
1914
2
1912
3
159 <
1753
1370
53
23 933
17 23153
833
1753
1907 W Jun
1753
179
1932
32
1900
3
159
1741
1370
53
23 933
17 23153
845
1741
1967-80 Jul
1741
464
2205
9
2196
2
148
2048
1374
57
23 958
17 24993
-530
2048
1987-66 Aug
2040
717
2765
10
2755
1
142
2613
1376
59
23 794
17 13133
27
2586
Mean
2221 069
147 92
56 67
23 76
205 2632
Starting
Irrigation
Power
End
Y«ai and       Storage     Inflow   Storage 1  requirement Storage     Reservab’   release    Storage 3    Mean       Head      Powei      Energy      Surplus    Storage
Month
Mcum
Mcum
Mcum
Mcum
2 Mcum
Zone
Mcum
Mcum
leveA m
m
MW
GWhi
Mcum
Mcum
1908 89 Sep
2586
767
3353
12
3341
1
142
3199
1376
59
23 794
1713133
613
2586
looses Oct
2586
422
30DS
14
2994
1
142
” 2852
1376
59
23 794
17 13133
266
2506
1908-89 Nov
2586
150
2736
3
2733
1
142
2591
1376
59
23 794
17 13133
5
2586
1988-89 Dec
2586
65
2551
16
2635
1
142
2493
1376
59
23 794
17 13133
93
2493
1980-89 Jan
2493
35
2528
29
2499
2
140
2351
1374
57
23 950
17 24993
-235
2351
1966-89 Feb
2351
24
2375
35
2340
2
148
2192
1374
57
23 950
17 24993
-394
2192
1988-09 Mar
2192
25
2217
26
2191
2
146
2043
1374
57
23 958
17 24993
-543
2043
1988 89 A(*
2043
32
2075
5
2070
2
146
1922
1374
57
23 950
17 24993
■664
1922
1988 89 May
19-22
68
1990
2
1988
3
159
1829
1370
53
23 933
1723153
-757
1829
1988-89 Juh
1829
220
2049
32
2017
3
159
1858
1370
53
23 933
17 23153
728
1858
1988-89 Jul
1050
571
2429
9
2420
2
140
2272
1374
57
23 958
17 24993
•314
2272
19B8-89 Aug
2272
882
3154
10
3144
1
142
3OD2
1376
59
23 794
17 13133
416
Mean
2275 333
2586
147 33
57 17
23 89
206 3694
Water Works Design & Supervision Enterprise
In Association with Intercontinental Consultants and Technocrats Pvt Ltd
'0L
Arjo De-de mi Hydropower & Irrigation Project
Meteorological & Hydrological Feasibility Studtea
June 2009
Starting
Slot age
Imgalwan
inflow i requh emerit
Storage Reietron
ni mi ?nna
rawci
release Storage 3 Mcum Mcum
Mean
Mead
Ye# and
Month
1909-90 Sep
I ftvpl m          m
Power
MW
Energy
UWhr
Surplus
Mcum
End
Storage
Mcum
MCuit.
7 566
Meuro 651
Mcum        MCU«'
3237
12
1909-90 Oct          7 586        3i6
2901
14
1
1
142
142
3063
2745
1376
1376
59 23 794 17 13133
59 23 794 17 13133
497
159
2586
2566
1999-90 Nov 1959 90 Dec 1909 90 Jan 1969 90 eb
66
70
32
19
142         2506         1376           59    23 794     17 13133             -80          2506
r
2586
2506
2312
216?
2651
w1
3225
2667
2648
1
2576
2344
2166
16
29
35
2560
2315
2151
2
2
2
140
146
148
2412
2167
2003
1374
1374
1374
57    23 958     17 24993
57 23 958
57 23 958
17 24993
17 24993
‘174
-419
-583
2412
2167
2003
2026
26
2000
3
1665
5
1800
3
1753
2
1751
3
1706
32
1674
3
1734
9
1725
3
2609
10
2599
1
19-99 90 Mar         2001        23                                                                                  159         1841         1370           53     23 933    17 23153           -745          1641
1909 90 Apr 1841 44 159 1721 1370 53 23 933 17 23153 •86S 1721
1909 90 May 1721 32 159 1592 1370 53 23 933 1723153 994 1592
1909 90 Jun        159?       114                                                                                  159          1515         1370           53     23 933    17 23153         -1071          1515
1989-90 Jul           U15       219                                                                                  159          1566         1370           53     23 933    17 23153         -1020          1566
1989 90 Aug        1566      1043                                                                                  142          2457         1376           59     73 794    17 13133           *129          2457
Mean                 2081 75                                                                                           150 58
56 00       23 69   206 4 328
Irrigation
Yew arvd
Month
Starting
Storage Infos*
StQiage 1 requirement
M*. urn Mcwn Mcum
Mcum
Storage Reservoir 2 Mcum Zcxve
End
Head      Power
Energy Surplus Storage
1990-91 Sep
2457
«70
3127
1990 91 0t1
12        3115
2566
281
2867
1990-91 Nov 
?566
46
14        2653
2632
1990 91 Dec 
2487
3        2629
23
2510
1990 91 Jan
2346
16
16        2494
1990-91 Feb
2362
2165
1990 91 Maz 
12
29        2333
2197
2014
11
7025
35        2162
1990 91 Apr
1840
19
•35!'i
26        1999
1990 91 May 
1695
1990-91 Jun
44
1739
5        1854
1578
114
2        1737
1990-91 Jul
IMS
1501
617
3?        1660
1990 91 Ajjq
2018
1850
964
2814
9        2009
Mean
2093 75
10        2004
1 1 1
2
2 2
3 3 3 3 3 1
Power
i ©lease Storage 3 Mem
Mcum Mcum I evei m
142          2973         1376
142          2711         1376
142         2487         1376
148          2346         1374
148          2185         1374
148          2014         1374
159          1640         1370
159          1695         1370
159          1578         1370
159          1501         1370
159          1850         1370
142 150 583
2662         1376
m           MW         GWhr         Mcum       Mcum
59    23 794     V 13133             387          3586 M    23 794     17 13133            125         ?S86
59    23 794    17 13133             -99          2467
57    23 958     17 24993           -240           2346
57    23 950     17 24993           -401          2185
57     23 958    17 24993          -572          2014
S3    23 933     17 23153           ‘746          184D
53     23 933    17 23153           -691           1695
53     23 933    17 23153        -1008           1578
53     23 933    17 23153          1085          1501
S3     23 933    17 23153            736          1850
59     23 7g4    17 13133              76          2586
56 00       23 89    206 4328
Water Works Design & Supervision Enterprise In AssMlaimtlnnnwwtLithhlaterwott-n--e--n--ia--l-C*onsultant. imtAr]o Dedessa Hydropower A Intgatioo Project Meteorological & Hydrological Feasibility Studies
June 20
09
Starting
Storage
Mcum
End
Ye*i and Month
Irtfcw
Mcum
Slooge i
Mrum
lingaflon
rsqu^emcM
Power
Mcum
Storage
2 Mourn
Reserve"
2one
release Sto
rage 3
Mean
Mcum
Mcum     l
evel m
Head
m
Power
MW
Energy
GWbi
Surplus
Mcum
Slcxage
Mcum
1991.92 Sep 2580 619 3205
1991-92 Ocl 2586 341 292?
1991-92 Nov 2586 121 2707
1991 92 Dec 2562 53 2615
1991 92 Jan 2457 29 2465
1991-92 Feb 2308 19 2327
1991-92 Mar 2144 20 2164
1991-92 Apr 1990 26 2016
1991-92 May           1852          55          1907
1991 9? Jun            1746        178          1924
1991-92 Jul             1733        461          2194
12        3193               1
14        2913                1
3        2704                1
16        2599                1
29        2456               2
35        2292               2
26        2138               2
5        2011                3
142
3061
1376
142
2771
1376
142
2562
1376
142
2457
1376
148
7308
1374
^46
2144
1374
140
1990
1374
150
1652
1370
2
1905
3
159
1746
1370
32
1892
3
159
1733
1370
9
2105
2
148
2037
1374
59 23 794 17 13133 465 2586
59 23 794 17 13133 185 2566
59 23 794 17 13133 24 2562
59   23 794    17 13133        -129        2457
57    23 956   17 24993        -278        2308
57    23 956   1? 24993        -442        2144
57    23 958   17 24993       -59G        1990
S3 23 933 17 23153 734 1052
53 23 933 17 23153 •840 1746
S3 23 933 17 23153 •653 1733
57    23 950   17 24993        -549        2037
1991-92 Aug Mean
2037 2215 583
711           2748
10
2736
1
142
2596
1376
59   23 794    17 13133
10        2566
146 25
56 03      23 00
206 351
Starting
Storage Inflow Storage i
lingalon
requiremenl Storage Reservoir
Power
Yeai and
ielease St
orage?
Mean
Head     Power     Energy Surplus :
End
Storage
Monih           Mcum      Mcum       Mcum          Mcum       2 Mcum       2one 1992 93 Sep            2588        336          2924                 12        2912                1 1992-93 Oct            2586        483          3069                 14        3055               1
Mcum
Mcum
Lewelm
142
2770
1376
14?
2913
1376
1992-93 Nov           2586        100          2605
3        26B3               1
142
2541
1376
m         MW         GWhi        Mcum      Mcum 59   23 794   17 13133         184        2585 59   23 794   17 13133         327        2586 59   23 794    17 13133          •45       2541
57    23 958   17 24993        -107        2419
29
2415
2
1992 93 Dec 2541 42 2503 16 2567 2
1992-93 Jan 2419 25 2444 1992-93 Feb 2267 18 2285 1992-93 Mar 2102 17 2119 1992-93 Ap< 1945 40 1905
1992-93 May           1821           80          1901
1992 93 Jun            1740        227           1967
1992-93 Jul             1776         383          2159
148
2419
1374
140
2267
1374
35
2250
2
148
210?
1374
26
2093
2
140
1945
1374
5
1980
3
159
1821
1370
2
1899
3
159
1740
1370
32
1935
3
159
1776
1370
9
2150
2
148
200?
1374
1992-93 Aug Mean
2002         699          2701 2197 583
10
2691
1
57    23 958   17 24993        ‘319        2267
57    23 958   17 24993        -484        2102
57    23 958    17 24993        -641        1945
53    23 933   17 23153        -765        1821
53    23 933   17 23153        ■646       1740
53    23 933   17 23153          810        1776
57    23 958   17 24993         584        2002
142         2549         1376          59    23 794   17 13133          “3?        2549
148 75
56 67      23 90   206 4696Arjo nedess* Hydropower & Irrigation Project Meteorological & Hydrological Feasibility Studios
u
June 2QO9
Start rg
Irrigation
Ptnrti
End
Year and Storage Inflow ! Storage 1 requirement Storage Reserve# release Storage 3 I Mean Head Powei Fnergy Surplus Storage
Month          Mcum     Mcum      Mcum         Mcum       2 Mcum       Zone        Mcum       Mcum L evei m           m          MW         GWnr       Mcum Mcum
1093-94 Sep
2549
370
2927
12
2916
1
142
2773
1376
69
23 794
17 13133
107
2566
1993-94 Oct
25M
244
2630
14
2816
1
142
2674
1376
59
23 794
17 13133
00
2506
1093-94 Nov
2586
108
2694
3
2691
1
142
2549
1376
50
28 794
17 13133
-37
2549
1993-94 D«
2549
36
2585
16
2569
2
14B
2421
1374
57
23 958
17 24993
-165
2321
199394 Jan
2421
23
2444
29
2415
2
140
2267
!■
1374
57
23 958
17 24993
-319
2267
1993-94 Feb
2267
12
2279
35
2244
2
14B
2096
1374
57
23 950
17 24993
2095
1993-94 Mar
2096
11
2107
26
2061
2
140
1933
1374
5?
23 950
17 24993
-653
1933
1993 94 Apr
1933
11
1944
5
1939
3
159
1780
1370
53
23 933
17 23153
605
1700
l993-94May
1700
45
1825
2
1823
3
159
1664
1370
53
23 933
17 23153
9??
1664
1993-94 Jun
1664
160
1824
32
1792
3
159
1633
1370
53
23 933
17 23153
-953
1633
1993-94 Jul
1633
340
1973
9
1964
3
159
1605
1370
53
23 933
17 23153
761
1605
1993-94 Aug
1805
736
2541
10
2531
2
143
2383
1374
57
23968
17 24993
203
2363
Mean
2155 75
ISO 17
5617
23 909
206 5698
Starting
IrngalKxn
Pcmei
End
Year and Storage Inflow Storage 1 requirement Storage Reservoir release ! Storage 3 Mean Head Power Energy !Surplus Slot age
Month          Mcum      Mcum      Mcum          Mcum       2 Mcum       Zone        Mcum       Mcum     Levelm        m          MW        GWhr       Mcum      Mcum
1994 95 Sep
2383
552
2935
12
2923
1
142
2781
1376
59
23 794   17 13133
195
2586
1994-95 Oct
2586
304
2690
14
2B76
1
142
2714
1376
59
23 794   17 13133
146
2586
1994-95 Nov
2586
108
2694
3
2691
1
142
2549
1376
59
23 794    1713133
■37
2549
1994-95 Dec
2549
47
2596
16
2560
2
143
2432
1374
57
23 958   17 24993
•154
2432
1994-95 Jan
2432
25
2457
29
2428
2
140
2280
1374
57
23 958   17 24993
JOG
2280
1994-95 Feb
2280
17
2297
35
2262
2
146
2114
1374
57
23 958   17 24993
•422
211 d
1994.95 Mar
2114
18
2132
26
2106
2
148
1950
1374
57
23 958   17 24993
-620
1958
1994 95 Apr
1958
23
1981
5
1976
3
159
1817
1370
53
23 933   17 23153
-769
1817
1994 95 May
1017
49
1866
2
1864
3
159
1705
1370
53
23 933 1 17 23153
•881
1706
1994-95 Jun
1705
159
1864
3?
1832
3
159
1673
1370
53
23 933 17 23153
•913
1673
1994 95 Jul
1673
411
2084
9
2075
2
140
1927
1374
57
23 956 17 24993
•659
1927
1994-95 Aug
1927
635
2562
10
2552
2
140
2404
1374
571
23 956 17 24993
102
24C4
Mean
21675
149 25
56 50
2191 206 5882
1
Water Works Design & Supervision Enterprise
In Association with Intercontinental Consultants aod Technocrats Pvt Ltd
33Arjp-Dtidnss* Hydropower 1 IrrJattian Fraject
Meteorola^cal t Hydra logical Feasibility Studies
Jm>e2«H
Starling
Yeai and Storage
Month          Mcum
hiigabOn
Power
Inflow
Storage 1
acquirement
Storage
Reservoir
r<*ea-se
Storage 3
Mcum
Mcum
Mcum
2 Mrum
Zone
Mcum
Mcum
EM
Mean Head Powe* E nergy Surplus Storage
I evel m m MW GWIw Mcym Mcum
543
2946
12
2934
1
142
2792
59
23 877
17 19166
206
2586
94
2680
14
2666
1.
142
2524
59
23 794
17 13133
452
252-4
36
2560
3
255?
2
146
2409
57
23 958
1 7 24993
■ 177
2409
H3
2492
16
2476
2
146
2326
57
23 950
17 24993
-258
2328
29
2357
29
2326
2
140
2100
57
23 958
17 24993
4Q6
2180
18
2196
35
2163
2
140
2Q15
199&96Sep 2403 1376
1935 96 Oct 2566 1376
1995 96 Nov           2524                                                                                                                                    1374
1995^96 Dec           2409                                                                                                                                    1374
1995 -96 Jan           2326                                                                                                                                    1374
l995-96Fcb            2160                                                                                                                                    1374
1995-96 Mar           2015                                                                                                                                    1370
1995 96Api             1856                                                                                                                                    1370
1995-96 May           1714                                                                                                                                    1370
1995-9BJun            1661                                                                                                                                    1370
1995-96 Jul            1741        4B2           2203                   9        2194               2          148         2040        1374
57
23 958
17 24993
-571
2015
26
2041
26
2015
3
159
1656
53
23 933
17 23153
■730
1856
22
1678
5
1873
3
159
1714
53
23 933
17 23153
■872
1714
108
1822
2
1820
3
159
1861
S3
23 933
17 23153
-925
1661
271
1932
32
1900
3
159
1741
53
23 933
17 23153
■845
1741
57
23 958
17 24993
-540
2046
1995 96 Aug Mean
2046 2121 92
515          2561                 10        2551                2          148 150 67
2403        1374
57
23 95B
17 24993
-163
2403
56 00
23 93
206 7487
Power
End
Year and
Starting
Storage Inflow Storage 1
iH’igafliofl
require menu Storage Reservoir
Month           Mcum      Mcum       Mcum          Mcum       2 Mcum       Zone
1996 &7 Sap           2403        358          2761                 12        2749               1
199B-9T Oct           Z506        225          2811                 14        2797                1
1996-97 Nov           2586          72           2656                   3        2655               1
1998-97 Dec           2513           50          2563                 16        2547               2
1996 97 Jan               33»          32          2431                 29        2402               2
1906-97 Feb            2254          21           2275                 35         2240               2
l9«-9TMai             2092           23           2115                 25        2089               2
19K-97Api              1941           29           1970                   5        1965               3
1996-97 May            1006          62            i860                   2         1856                3
1596-97 Jun           17Q?         190          1906                 32        1074                3
1996-97 JuF 1715 510 2234 9 2225 2
ietea5e Storage 3 Mean Hoad Power Energy Surplus Storage
Mrurr-       Mcum     Level m
m
MW
GW*
Mcum
Mcum
59
23 794
17 13133
21
250B
59
23 794
17 13133
69
2586
59
23 794
1? 13133
-73
2513
57
23 958
17 24993
-167
2399
57
23 956
17 24993
■332
2254
57
23 950
17 24993
■494
2092
57
23 958
17 24903
645
1941
53
23 933
17 23153
-700
1606
53
23 933
17 23153
■879
1707
53
23 933
17 23153
871
1715
57
23 958
17 24993
-509
2077
1996 97 Aug           2077         798           2875 Mean                  2173 25
to        2865               1
142         2607         1376
142         2655        1376
142         2513        1376
148   •=• 2399        1374
148         2254        1374
140         2092        1374
148         1941         1374
159         1806        1370
159         1707       1.370
159         1715        1370
148         2077        1374
142         2723        1376
148 75
59
23 794
17 13133
137
25-96
56 67
23 90
206 4696fa        k
Arjo-Dedem Hydropower 1 Irrigation Project
Meteorological & Hydrological Feasibility Studies
June 2009
Starting
IrrHjXton
Power
End
Year and Storage Inflow Sfoiage t i equifemenl Storage Reservon i elease Storage 3 Mean Mead Puwei Energy ! Surplus !Storage
Monlh          MCum     Mcum      Mcum          Mcum       ? Mcum      Zone        Mcum       Mcum Level m            ffl          MW         GWhr        Mcum      Mcum
1997-90 Sep
2588
810
3196
12
JIM
1
142
3042
1376
59
23 794
17 13133
456
2566
1997-90 Oct
2508
339
2926
14
2911
1
142
2?69
1376
59
23 794
17 13133
183
2586
1997-98 Nov
2608
118
2704
3
2701
1
142
2559
1376
59
23 794
17 13133
-27
2559
1997-96 Dec
2559
63
2612
16
2696
1
142
2454
1376
59
23 794
17 13133
-132
2454
1997-96 Jan
2454
36
2490
29
2461
2
140
2313
1374
57
23 958
17 24993
-273
2313
1997-96 Feb
2313
24
2337
35
2302
2
148
2154
1374
57
23 950
17 24993
-432
2154
1997-9B Mat
2154
25
2179
26
2153
2
140
2005
1374
57
23 958
17 24993
■581
2005
1997-90 Apr
2005
32
2037
5
2032
2
148
1804
1374
57
23 958
17 24993
'702
1804
199 7’90 May
1834
60
1052
2
1O5O
3
159
1791
1370
53
23 933
17 23153
■795
1701
1997-90 Jun
1791
220
2011
32
1979
3
159
1020
1370
53
23 933
17 23153
■766
1020
1997-98 Jul
1820
573
2393
»
2364
2
148
2236
1374
57
23 950
17 24993
-350
2236
1007-93 Aug
2236
900
3116
10
3106
1
142
2964
1376
59
23 794
17 13133
378
2586
Mean
2247 83
147 33
57 17
23 89
206 3694
Sterling
Irrigation
Power
End
Year and
Storage
Inflow
Slaage 1
requirement
Storage
Reservoir
release
Storage 3
Mean
Head
Powe*
Energy
Surplus
Storage
Month
Mcum
Mcum
Mcum
Mcum
2 Mcum
Zone
Mcum
Mcum
Level m
m
MW
G’ATtM
Mcum
Mcum
1998-99 Sep
2566
610
3196
12
3164
1
142
3042
1376
59
23 794
17 13133
456
2536
1998-99 Ocl
25B6
339
29J5
14
2911
1
142
2769
1376
59
23 794
17 13133
163
2506
1998-99 Nov
2506
118
3704
3
2701
1
142
2559
1376
59
23 794
17 13133
-27
2555
1998 99 Der.
2559
63
2612
16
2596
1
142
?454
1376
59
23 794
17 13133
■132
2454
1998-99 Jan
24M
35
7489
29
2460
2
148
2312
1374
57
23 950
17 24993
-274
2312
1998 99feh
2312
24
2336
35
2301
2
140
2153
1374
57
23 958
17 24993
-433
2153
1998-99 Mar
2153
25
2178
26
2152
2
148
2004
1374
57
23 958
17 24993
-562
2004
1998-99 Apr
2004
32
20M
5
2031
3
159
1872
1370
53
23 933
17 23153
-714
1672
1998-99 May
107?
68
1940
2
1936
3
159
1779
1370
53
23 933
17 23153
-007
1779
1998-99 Jun
1779
220
1999
32
1967
3
159
1808
1370
53
23 933
17 23153
■77&
1806
1998 99 Jul
1800
573
2361
9
2372
2
148
2224
1374
57
23 958
17 24993
36?
2224
1998 99 Aug
2224
880
3104
10
3094
1
142
2952
1376
59
23 79d
17 13133
366
2586
Mean
2243 58
148 25
56 83
23 06
?06 351
Water Works Design & Supervision Enterprise
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41
June 2009
Stort=ng
Storage
Irrigation
Power
Year and
Inflow
Storage i
requiiemenl
Storage
Reservoir
release
Storage 3
Mean
Head
Power
Fneigy
Surplus
End
Swage
Month
Mcum
Mcum
Mcum
Mcum
2 Mcum
Zone
Mwm
Mcum
levelm
m
MW
GWhr
Mcum
Mcum
1999 00 Sep
2506
751
3337
12
3325
1
142
3183
1376
59
23 794
17 13133
597
2506
1999-00 Oct
2556
417
3003
14
?9B9
1
142
2847
1376
59
23 794
17 13133
261
2506
1999-00 Nov
25BS
146
2732
3
2729
1
142
2587
1376
59
23 794
17 13133
1
2566
1999 00 Dec
2566
65
2651
16
2635
1
142
2493
1376
59
23 794
17 13133
-93
2493
1999-00 Jah
2493
30
2523
29
2494
2
140
2346
1374
57
23 968
17 24993
-240
2346
199900 Feb
2346
M
2366
35
2331
2
140
2163
1374
57
23 950
17 24993
-403
2103
1999-00 Mar
2163
21
2204
26
2178
2
140
2030
1374
57
23 950
17 24993
•556
2030
1999-00 Apt
2030
27
2057
5
2052
2
140
1904
1374
57
23 956
17 24993
•662
1904
1999-00 May
1SD4
57
1961
2
1959
3
159
1BOO
1370
53
23 933
17 23153
-786
1800
1999 00 Jun
1600
1fl5
1W5
32
1961
3
159
1794
1370
53
23 933
17 23153
-792
1794
1999-00 Jul
1794
462
2276
9
2267
2
140
2119
1374
57
23 956
17 24993
*467
2119
1999-00 Aug
2119
740
2659
10
2649
1
142
2707
1376
59
23 794
17 13133
121
2506
Mean
2251 06
147 33
57 17
23 69
206 3694
Starting
ImgrMion
Pow
End
Year and Storage
Month          Mcum
inflow
Mcum
Storage 1 pegurftmeni
Mcum         Mcum
Storage Reservoir release l Storage 3 Mean
2 Mcum Zone Mcum Mcum l evel m
Head Power Energy Surplus Storage
m MW GWtu Mcum Mcum
2000-01 Sep
2586
632
351
123
54
51
35
45
41
9?
291
473
630
32 U
12
3206
1
142
3064
1376
59
23 794
17 13133
478
2586
2000-01 Oct
2586
293?
14
2923
1
142
2701
1370
59
33 794
17 13133
2586
2000-01 Nov
2586
195
2709
3
2706
1
142
2564
1376
59
23 794
1? 13133
-22
2564
JOOO-OIOec
2564
261B
16
2602
2
140
2454
1374
57
23 956
17 24993
-132
2454
2000 01 Jan
2454
2505
29
2476
2
146
2328
1374
57
23 950
17 24993
■258
2328
2000-01 Feb
2328
2366
35
2331
2
■148
2163
1374
57
73 958
17 24993
-403
2183
2000-01 Man
2m
2228
20
2202
2
146
2054
1374
5?
23 958
17 24993
-532
2054
200G-01 Apr
2054
2095
5
2090
2
140
194?
1374
5?
23 958
17 24993
■644
194?
200001 May
1942
2039
2
203?
3
159
1076
1370
53
23 933
17 23153
2000 01 Jun
706
18?8
2169
1876
32
2137
2
148
1969
1374
57
23 958
1? 24993
200001 Jul
ms
2462
-59?
1989
9
2453
2
148
2305
1374
57
23 956
17 24993
2000-01 Aug
2305
•261
2305
2935
10
2925
1
142
2703
1376
Mean
59
23 794
2287 92
17 13133
197
2565
1*6 92
5? 33
23 90
206 5064
Water Works Design & Supervision Enterprise
io A wool itioa with Intercontinental Consuluuis nod Technocrats Pvt. Ltd
36Arjo Oedesss Hydropower & Irrigation Project
Meteorological Hydrological Feasibility Studies
June 2009
Starting
Irngalion
Power
End
Year and         Storage I nflow Stooge 1 requirement Storage Reserv&r release Slotage 3 Mean Head Power Energy Surplus Storage
Month         Mourn Mcum          Mcum         Mcum       ? Mcum       Zone        Mcum       Mcum level m              m          MW        GWhr Mcum Mcum
2001 02 Sap 2586 546 3132 12 3120 1 14? 2978 1376 59 23 794 17 1313 392 2586 2001-02 Ort 2580 301 2887 14 2873 1 142 2731 1376 59 23 ?94 17 1313 145 2586
2001-03 Nov         25B6        WB         2694
3        2691                1          142         2549         1376          59 23 794       17 1313           -37         2549
2001-02 Dec          2M9          47           2596                16        2580               2          148         2432         1374          57    23 958    17 2499         -154        2432
2001-02 Jan 2432 25 2457
2001-02 Feb 2280 17 2297
2001-02 Mar 2114 IB 2132
29        2428               2          148         2280         1374          57 23 958        17 2499         -306        2260
35        2262               2          14B        2114         1374          57 23 950 17 2499                -472        2114
26 2106 2 140 « 1958 1374 5? 23958 17 2499 -628 195B
2001-02 Apr 1950 23 1961 5 1976 3 159 1017 1370 53 23 933 17 2315 ■769 1817
2001-02 May 1017 49 1866 2 1B64 3 159 1705 1370 $3 23 933 17 2315 ■861 17G5
2001-02 Jun 1705 159 1864 32 1832 3 159 1673 1370 53 23 933 17 2315 913 1673
2001-02 Jul 1673 411 2084
2001-02 Aug 192? 634 2561
9 2075 2 148 1927 1374 57 23 958 17 2499 ■659 1927
10       2551                2          148         2403         1374           57 23 950        17 2499         -183         2403
Mean                2184 42                                                                                             149 25
56 50      23 91. 206 568
Starting
Irrigation
Power
End
Year and      Storage    Inflow    Storage 1 requirement    Storage Reservoir release Storage 3            Mean       Head Power Energy Surplus Storage
Month         Mcum     Mcum       Mcum           Mcum       2 Mcum       Zone        Mcum       Mcum Level m            m          MW        GWYir |    Mcum       Mcum
2002-03 Sep
2403
598
3001
12
2909
1
142
2047
1376
59 23 ?94        17 1313
261
2566
2002-03 Oct
2586
329
2915
14
2901
1
142
2759
1376
59 23 794 17 1313
173
2586
2002-03 Ntjv
2506
117
2703
3
2700
1
142
2556
1376
59 23 794        17 1313
-26
2553
2002-03 Dec
2558
51
2609
16
2593
1
14?
2451
1376
59 23 794 17 1313
■135
2451
2002-03 Jan
2451
27
2470
29
2449
2
140
2301
1374
57 23 95B 17 2499
-265
2301
2002-03 Feb
2301
18
2319
35
2204
2
140
2135
1374
57 23 95ft 17 2499
-450
2136
2002-03 Mar
2136
19
2155
26
2129
2
140
1981
1374
57 23 950 17 2499
-605
1901
2002 03 Apt
1901
25
2006
5
2001
3
159
1042
1370
S3 23 933       17 2315
-744
1042
2002-03 May
1042
53
1095
2
1093
3
159
1734
1370
53 23 933 17 2315
852
1734
2002-03 Jun
1734
172
1906
32
1874
3
159
1715
1370
53 23 933 17 2315
-671
2002-03 Jd            1715        445          2160
9        2151                 2          148         2003         1374           57 23 95B 17 2499                 503         2003
1715
2032-03 Aug          2003        689          2692                 10        2682                1          142         2540         1376           59 23 794        17 1313           -46         2540
Mean
2191 33
148 25
Water Works Design & Supervision Enterprise
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17
la Association with Intercontinental Consul tan is and Technocrats Pvt tidMff* DtJsnfc
‘ ^rrkf.uVrt PruJ«f
Meteorological & Hydrological Feasibility Studies
June ZOT9
Starting Storage
Mcum
Irngaton lequiremenl
Mcuti
Row*!
End
Year and
InRow
Mcum
Storage 1
Slcxage Res
ervoir
fc*eaM
Mcum
Storage 3
Mean
Hesd
PD*er
Energy
GWhr
Suiptos Mcum
Storage
Month
Mcum
2 Mcum
Zone
Mcum
I evel m
m
MW
Mcum
2003 04 Sep
2540
533
3073
12
3061
1
142
2919
1370
59
23 794
17 1313
333
2506
2003-04 Oct
2586
293
2870
14
2665
1
142
2723
1376
59
23 794
171313
137
2586
2003-04 Nov
2556
i(M
2690
3
2607
1
142
2545
1376
59
23 794
171313
-41
2545
2003 04 Dec
2545
45
2590
16
2574
2
140
2426
1374
57
23 958
17 2499
’160
2426
2003-04 Jan
2425
24
2450
29
2421
2
140
2273
1374
57
23 958
17 2499
-313
2273
2003-04 Feb
2273
16
2289
35
2254
2
148
2106
1374
57
23 950
17 2499
-400
2106
2003-04 Mar
2106
17
2123
26
2097
2
140
1949
1374
57
23 958
17 2499
-637
1949
2003 04 Apr
1949
23
1972
5
1967
3
159
1800
1370
53
23 933
17 2315
’770
1808
2003 CM May
1608
47
1855
2
1653
3
159
1694
1370
53
23 933
172315
■892
1694
2003 04Jun
1694
153
184?
32
1015
3
159
1656
1370
S3
23 933
17 2315
■930
1656
2003-04 Jul
1656
397
2053
9
2044
2
148
1096
1374
57
23 956
17 2499
-690
1896
2003-04 Aug
1696
612
2508
10
2490
2
140
2350
1374
57
23 958
17 2499
-236
2350
Mean
2172 08
149 25
56 SO
23 91
206 580
Water Works Design & Supervision Enterprise
In Association with lnlercoDtlnenUil Consultants and Technocrats Pvt Lid
38Ar|i>Dedflssa Hydropower A Irrigation Project MetenrMjglcal & Hydrological Feasibility Studies
^nne?t C Standards
Cl         CornfTOfliy used i/atfues of runoff coefficient;
Clas s         Description of catchment
A             Fiat, culuvaied and olo cpilon soils
B             Frai, partly cultivated stiff sods
C             Average catchment
b           Hills and plains with litcre cuiltivation
E            Very hilly and sleep with little or no cuttiyarttoni
June 2009
Runoff
percentage
10
15
20
35
45
C2 Runoff Qoeffi&eTw tor pervious surfaces by selected hydrusog/c sotl
groupings and slope ranges
Terrain Type
£
Soil Type
B
c
D
F Flat. <2%
Rollpng.7-6%
0 04 . o 09 0 07-0 12
0 09 ■ 0.14 0 12-0.17
0 11 - 0.16 0 15-0 20
0.16-0.21 0 20 • 0 25
Mountain, 6-15% Escarpment =15%
0.13-0.18 018-022
0  18  -0  24 0 24 - 0 30
0.23-0.31
030 - 0 40
0.28-0
0 38-0
t*aSE Where A, 8, C ana D are defi.ied « jhown jn C3
Water Works Design & Supervision Enterprise
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&sArjo Dedessa Hydropower & irriKidon Project Meteorological & Hydrological Feasibility Studies
June 2009
C3
SCS Curve Afambe« for vutiuus Conditions
Cover Description
Curve numbers for
hydrologic, soil group
_____ ■=-— *
Cover type
Fallow Bare soil
Crop residue
cover (CP I
Pasture    grassland,    or    range continuous lorage fur grazing'
Meadow-continuous        grass, protected trom grazing
Brush-weed-grass     mudure     with brush the major element*
Woods-grass combination'
Woods’
Farms—buildings, lanes. driveways,
Hydroiogi
c
condition
Poor Good
A
77
76
74
Poor                    68
Fair
Good
Good
49
39
35
48
35
30"
57
43
32
45
36
30d
59
B
S6
65
83
79
69
61
59
67
56
48
73
65
58
66
60
55
74
C
91
90
68
66
79
74
72
77
70
65
92
76
72
77
73
70
62
D
94
93
90
89
64
00
79
83
77
73
86
82
79
83
79
77
86
and surrounding lots ____________
Arid and sami-arid rangelands*
A
C
D
r.-iri.-f
Mixture of grass weds, and K>w
growing   brush   with   brush   The   minor element
Mountain tuusn mixture ol small trees and brush
Small trees with grass understory
Poor                                       80              87             93
Farr Good
s-e-
71
62
Bl
74
89
85
PoOr                   —              66              74             79
Fair
—              48              57             63
Good — 30 41 48
Poor — 75 85 89
Fair
...
56              73             SO
Brush with grass underslairy
Desert shrub crush
Good — 41 61 71
Poor — 67 80 55
Fair 51 63 70
Good — 35 47 55
Poor 63 77 85 88
Fair 55 72 81 86
Gooo 49 66 79 64
Water Works Design & Supervision Enterprise
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Meteorological & Hydrological Feasibility Studies
C3:                    continued}_________ _
’ Average runoff condition, and I. = 0.2S
? Poor < 50% ground cover or heavily grazed wrth no mulch
Fair 50 to 75% ground cover and noc neavily grazed
Gcoo > 75% ground cover and lightly or onty occasionally grazed
'Poor < 50% ground cover
Faa 50 to 75% ground cover
Good » 75% ground cover
4 Aduai curve number <s (ess man 30. use CN = 30 for runoff compulations rnmfcinaboris a« s CNs shown were computed for areas with 50% grass ipastum) cover Other Domt.nat.ons 
June2flos
condrtrans may be compiled from CN$ tor woods and pasture
• to Forest liner small trees and brush are destroyed by heavy graz.ng or regular
rpnniar
burn ng
Fair       ^crads. grazed Out not Oumeo, and some forest litter covers the soil
□doc         Woods protected from grazing tflte* and brush adequately cover so 7 Poor < 30 % ground cover (kW. gm. and hr Ah overstory.
Fair X to 7D % ground cover
Sort Groups
wrtfr
I_______________________ I
Gnj^p A Sand, loamy  sand .or sandy  warn Soils  having a iow runoff potential due io high mfiiiratiori rates  These soils  pnmanly  consrst of deep wefl-dramed sands  and gravels
Gam? 6 SA loam or loam Soils  having a moderately  low runoff potential due to mcoerale infiltration rates. These soils  primarily  consist of moderately  deep to oeep moderately well to well drained soils with moderately fme to moderately coarse textures
Group C Sandy  clay  loam Soils  naving a moderately  high runoff potential due to slow infflirafion rates  Tnese soils  primarily  consist of sorls  in wtncn a layer exists  near the Surface that impedes  the downwaro movemeni of water or soils  wilh moderately  fine to fine texture
Group D Clay loam. sAy clay loam, sanoy day, Silty clay or day Soils having a high runoff potential due to very siow infiltration rates These soiFs pnmanly consist of days wrth mgh sweiing potential, soils wrth perrnanentty-hign water tables soils with a clay pan or day -aye* at or near the surface and shallow soils over nearly imperious parent material
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CJ       Reservoir Flood Sraodams
June 2009
------------------- 1------------
Category cl reservoir        fn/D'ar
CCmdFtfDJT
Dam design flood inflow
Min. standard,
General
Rare
overtopping
Wirttf speed,
MiA wave
surcharge
Spilling
»ong term av
A     Breach endangers in      Daily
laves m commentary      inflow         PMF
Larger of 0 5            Average PMF or 10 000       annual maM
year flood
B  Breach may
Larger of
hourly wmd
Wave
endanger lives nol in
0 5 PMF or
Larger of 0 3
Surcnarge
a community
10 000 year
PMF or 1 000
allowance >06
exiensive a ram age
Full
flood
year flood
m
Av Annual
max hourly
1c
Breach win
Larger of
wind Wave
negligible nsK lo life
0 3 PMF or
Larger of 0 2
surcharge
and causing limited
1,000 year
PMF or 150
allowance *04
damage
Full
flood
year flooo
m
I
_I
For fth* piwptf.fce of PjMF Me oretowres of Me ramp-Mied PMF /l/oragrapfi are mufflptetf £■> Me pfflpGfflOfl ^JJca-fetf
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C5 fiaftos of the banc drfnens/ortl&ss OyOrograpf) of toe SCS
June 2009
T/Tp            Qb'Qp           Tin-p            Qi/Qp            TVTp            Oi/Qp
0                  1 05               099                  26                 0 13
r°
0 06 0 008
0.1 0 015
11                 0 98                 2.7                 0 11
1.15               0.95
015 0 043 1.2 0 92
0.2 0 075 1 25 0 88
0.25 0 11 1 3 0 84
03 0 16 1 35 0 80
0 35 0.22 1 4 0 75
04 0 28
045 0 36
1 45               0 71
1.50               □ 66
0.5 043 1.55 0 61
0 55 0 52 1 6 0.56
06                  06
0 65               0 69
07                0 77
1 7                0 49
1.3                0 42
1 9                0 37
2.8                0 09B
2.9                0 088 3                 0 075
32                0 056
3.5                0036 37                0 027
4                0 018
4 2              0 014
45                 0.009
4 7               0 007
5                 0 004
0 75               0 83                2 0                0 32
0.8                0 89
0 85               0 93
09                0 97
095               0 99
J
1
2 1                 0 28
22                 0.24
23                0 21
24                 0 18
2.5                0 16
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Ct GuiOOJiflSS fpr /nterpreisfrans of Wart/" Qt??Jrty lOf trfigotfon
JuneOTOS
Water parameter
Symbol
Unit
Usual range in irrigation
water
SALINITY
Salt Concern
Electrical Conauctivity
EC,
dS/m
0-3
dS/m
for)
Total Dissolved Solids
TDS
mg/i
Q - 2000
mg/l
Cations ano Amons
Calcium
ttsr
me/l
0-20
me/l
Magnesium
Mg"
me/l
0-5
me/l
Sodium
Hu*
me/l
0-40
me/l
Chlorine
CT
me/l
0-30
me/l
nutrients*
.Pcnassium
K’
mg/l
0-2
mg/L
MISCELLANEOUS
Acbd/Basioity
pH
1-14
60-36
Sodium Ao&nrplion Ralio-'
SAR
(me/l)-. ;
0-15
Staypp.  FAO,  T53<  iVBJer  Quality  for  Ajntv.'r.tr/e  Irngatton  and  Dr&nage  Paper  Ma  RSv  f Rlapmletr. t93<
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Meteorological ft. Hydrological Feasibility Studies
Annex D Meteorological Data
DI Dwarfs c/ Mereortw^ca Otiservafran Starts (Rs* D&* Collection)
June 2»oy
Sttiion Name
Latitude
North
Longituoe
East
S.No
Attitude
<m|_ .
Class
1
1               Agflro                         07          S1          36           36              2030 —■=-■-----
D--i         Mm.        Deg.     Min.
iADiH
-
r_ l jfl
Period
190 JUll-2jlUU4
2               Arjo                             00           45          36           30              2565            1972-2004                   3
3                Benelse                      00           27        36           20              2030            1967-2004                   1
4                Dwessa                         00           23          36           06             12DD           1971-2004                   1
5             Demm                         M           04           36           27              1950            1954-2004                   3
&               GimOi                         09           10          35           47              1970            1970-2004
1
7               Jimma                        07           4D          36           50              1725          1952 -200 4                  1
0              Kone
OS          41           36           47             2000           1979-200-4
4
9              Mewo                          00           41           36           02              2000             1980-1969                  4
10 Nekamte 09 05 36 26 2080 1971-2QCW i
11             Wanna
M 1         59          36           40               1450             1980-198/                  3       J
02 Types of Citmauc Data available at ffte various Meteofotogtca!
Ctose/v^fjpn Srarnons
,              ----------- 4
Attitude
SNo
.
I A#aro 2030 25 X x X X X X
Station Hama                   im)
Yra        RF
TM             Rrt WS           SD
-1
2 Arjo
3
2565             33              X                  X
2030 IS X X X X X
4         Deowsa                       12DO           34              X                  X               x             X
X
5         Derra&i
195C           51              X                  X
6         GimOi                           1970            27              X                  X               X              X                X
7         Ji mma                         1725             53             X                  X               X              X               X             X
6         Kone                            2000             26             X
9         Mefto                            2000             10             X
10        Nexemie                           2080             34              X                  X               X              X                X
11        Wama                           1450              0               X                  X
Yrs
RF
Tm
RH
ws
v JT*I ■ 1.-.
refer to ramfall senes
nwUh'ly rainfall
average lemperauMe
relative humidity
wind SptM
so
1 IW
1 day
Relay
Synsnme duration maximum 1-hour rainfall maximum 1-<jay rainfall numbTflf nwn days
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45Arjo-Dedcssa Hydropower & IrrtfatiOD Projcci Meteorological & Hydrological Feasibility Studies
D3r Mean Monf/i/y RainMI af BedeJe Srauon
f/n fnmj
June 2009
Year
Jan    Feo |
lafchjApril May Jufl»
1967
1968 1959 1970 1971 1972
I 1973 19?4 1975 1976 1978 1979 1980 1983
1984 1993 1994 1995 1996 1937 1998 1999 2000 2M1 2002
2003 2004
00 0        too
67       59 54       50 20        1 0        20 0        19
68       13 44      101 41        29
57 00 00 0a 00 2        34
17        2
0        17
48        34
53        2 13       15 28        3 00 0        33 16        4 7        66 63
333
267
350     408
236
499
469
210     357     200
250     258     276
257      318     353
290      203      128
242
273      286
309
245
320
CV
Suw
Mik
Mm
18 23
1 28 1 28
1 t?5    1 6
68 101
00
329      370      21
296     202     253
270      259      197
299     268     273
310     303     302       756
0 312 0 242 0 21 0 266 0 563 1 256
-0 91   0637
0 56  0 345   0 375   2 913
447     49.9     468     472       328      253
0
202      126       9
0
Annul* 1980
1539 1897 2322 2101
1788
1790
2171
1796
1993
1926
1035
1706
2293
1637
1680
1484
1837
1670
2001
1942
2321
1827
2155
1450
1446
1917
1864
0.14 0.18 2322
1446
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Of Mean Monthly R.wfofi flf Jrmmo Srornsn (rrr mm)
------
!!      —-------U —“7"
Y«r
Jan Feo March ApriJ May
__ 5^3 Sepr_0ci Nov
Dec Annual
1953 1954 19S5 1956 1957 1958 1959
IMO
1^1
1963
1954
1965
1956
1967
1968
1969
uro
1971 1972
1973
1974 1975 1976 1977 1979 1979
19M
1991 1992 1963
1994
33        49        88        ,33      172    283     399     211       256       116        1           3
33        43        68       135      94      29fi     235      244       169       103       36         23
91        25       100      109      96      183     2BB     254      215        50         16         96
29         4         63       299     142     226     169      195      249       116         3           3
8         49        se       T33
93     21D     194      214       152       27        6E>       36
0         52       117      2*5      225     278     185      189       82
68         25         11
43        06        53       138     141     292     203      215       286        87         15         42
81      14C’      86       136     103     170     272      138      151       130        88         32
11        39        IM       145     2&4     2T9     135      2J0      212        38         68         28
0         86        98       225      197     237     272      262      243        97         22i         73
40        57       131      116     106     206     221      206       225       164        24         "09
43 4 39 203 102 249 205 191 58
21 73 100 153 122 161 307 172 139
107 116 25
56 17 13
4         15       198      82      157     273     207      203       250       132       215         2
3         74        63      1Q5     154     233     173      246       210        31         59         55
M        61        '99       91       109     165     109      185       104        05         35          5
76       135       9t        188     103     288     197      263       148       149        era        38
Ifl         3         58       81
267     153     ros       204      201       124       107        44
12        74       127      115     101     161     159      193       167
58        183         0
28        11         7        149     148     180     297      160       181        57         10         10
5       56        76       103     320     165     221      285       240        25          1           1
4         65      TOO     171     120     19B     252      194       151        98          7          55
36        85       107      112     189     324     211      233       190        93        116        25
73        56        54        16       130     197     203      268       191       229        81          15
5        71        42       136     204     222     184      215       203        54         57         38
32       110      111       23       116     232     153      164       115
75          9          22
23       42       100      301      108     169                  164       141       109        27         28
1          7        136       62      252     114     193      250       164
31        127         1
1995
25
20
77
147
203
136
2M
16$       128
83
SO
1966
0
48
82
115
151
256
233
134       163
84
14
1987
26
69
156
60
188
204
186
180       136
116
46
1986
91
59
31
87
iaz
165
185
294       220
172
2
19S9
34
47
156
179
102
179
232
213       204
107
28
1990
25
46
133
56
194
320
280
289       245
23
93
1991
29
81
62
169
110
223
200
246       140
51
8
1987
20
56
56
105       43        61       136     2H       223     141      192       157        94        212        37 20        40        97       161     228     166     174      229       299       144             54          7
24        IT        32        83       191                 211      166       187        12        138        50
12
47 52
0 170
19 78 36
162
144
287
212
344       175
ISO
70
1743
1270
1507
1523
150&
1446
1504
1509
1454
2012
1606
1341
1333
1819
1408
1283
1743
1«5
1350
1237
1479
1414
1723
1491
1442
1169
1320
1337
1611
1614
1288
1297
1331
1440 1477 1627 1712 1445 1749
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____
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Oi■■a
D4; (,.. continued)
_     --- -------- -—---------- —_•
Annual
Year
Jan Feb March April Maj June July Aug SepL 5^1—-------------------------------------------
1993
1994
1995
1996
1997
1998
1999
2MM
2001
2002
2003
2004
_
g          81      110      237     257       225    189       263       16*     »7
33        20       87       153     213       274    255       155      177      it
B        27        74       103      115     153     181     21®      141
36         22      135      203      175      1«3     231         91      245       24        --
6i                  ,9       69       178     274       237    122       278                    «           «            * 103        22       97        93      174       223    245       307      200     201       47         1 30           1       ^4        72       214      575     13C       102   131
0            1       39       194      238      154     266       158      255      2
16         13       86       117      341      299     312       181        «3       &
'
2
69           5       11        M       13?      242     150       235      165       80        8           ™ 29         61       87       111       12       272     187       151      239        W        »
51 2fl 46                       131      152     128 216          219       210 J3j_  -'_
6
1534
1415
1290
1476
2D34
1713
1546
1622
1772
1330
1205
1482
**9
CV
S*w* Ma*
33            45      88    133      172      21?        ™         ™         fS?              T°*     **
OBS       0 71    048    0 43     0 39      03*     02*     0 26     0 26      0 67  ■
095           W   055    O*i        041      253    0 17     0 12      00*       110          «         -
;
UO       199    301       341      575        3^      344      ?99       337      243    170 n          t                        7         i«         12      114      96        91         M.-------- LL---------L     £.
__
J54?2
0.13
Off!
?OM
1169
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June 2000
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June 2MB
OS Afwn
(m oC)
Year
bi
Station w Date fi&Jcvo twp fflrng.
F»d        Mir      Apr      M*y     Jun       Jul       Aug   L**p I   Oct
Dec
1971       17,(     19 9      212     20 8     21 5     20 4       102       16 7      16 6      15 5      154      172
Hffe
195      20 9      :6 4      179     19 8      183
158       159
1973      17 9     18 7      715     21 5      194      1?9      w.3        164       180      17 3      174      J* 0
1974       177      190     19 3     20 2     10 7      182       16 9      15?       172      17 1      17 9      170
1975       173      193        ia?      198     194     17 7      16 7      162       17 7      IB 1      172
1976       :7 9     18 1     19 1      188                  178       176       17.3     17 1      17 7      170      16 7
1977      18 2      190
1978 17 3 18 4 19 3 16 9 18 5 17 5
16 8 16 0 16 1 19 7
16 0      16 5
1979                   21 0     20 5     19 7     19 5       79        106       173      17 3      17 5
1980
19B1 17 3 175 17 i
IS? 19 1 176 17 2 16 9 174 170 17 6 174
17 0
1962
1983                    7 5      19 1      20 i     17fl       174       176       18 3       tft?       19 0      19 4     20 8
1M4
ms
214      21 2     33 0     19 7      -8 0      16 9      I? 3       174       186       10.9      196 20 5     20 5     21 4      205      186      tea       172       17 1      17 3      17J       1B8      10 9
1986       19$     20 6     20 8      309     21 4     18 1      17*        178      17 7      102       18 7      1B4
1967       194      20 8     20 4
1B 1      102       18 3      190
1988      19 7     201      300       216      196     18 1      17 0       17 3      17 5      10 3      182       17 9
1969       178      18 7     19 1     19 3      190      17$       150       17 J      17 7      17 5      180       17 0
1990      19 i       187     19 5   20 2     19 3      185       174       174         17 8      IB 2       18 9      191
1991      19 3     20 6     20 7      2i 0     20 4      103                     17 4        10 _      184       18 7     20 0
1992
wl
1W*
1W5
19 1     20 1      21 3     20 6     20 7     T9 5      104       100          196      19 1      18 8      206
20 9     20 9     22 0     21 3      195                   17 8      177       18 2      i9O        196      18 S 20 5     20 8      2i 3     21 4      199     10 4      178        16 1      185      18 8      18 9      19 5
1996      19 2     21 0     20 8     20 7     19 1     18 4      17 8       180       183       16 3      18 5      18 7 195?       192      19 9     21 5     19 9     19 3     18 5      178        100        l&fi
1998       139     21 2     21 2     23 2     21 6     10 3       10 1      18 3      18 9      10 2      186       19 2 1999       19fi      21 7     21 7       i, a     19 1     18 7      17 3       17 7      186       17 9      18 4      19 2
20M
177       173       185      ia g        t&£       18 9
2001      19 1      30 5     20 7     21 2      199      180       17 5       13?       18 6      194       18 7      192
2002       192     21 1      21 6     21 8     21 2      185       10 3      17 5      18 1      181       18 &      109
2003       200      21 5     21 1     21 2    21 8    10 7      17 6      181     186                    19 6      196
2004       208      21 0     22 1     21 fi     20 8     18 3      1T«       181       10 6      >8 7      19 i        196
Avngw fS ? 10 7 306 206 T9 6 tea 17 1 ?7* 17 9 ?80 18 5 lit
C¥        0 08      0 13     0 05    0 t?5    ax        0 T2      005       00*       t?U5      CUM     OM        aos
-T2T     -396    •1 19    -0 08     000    -4 24     ■2 06    -0 88     -0 58     h0 94      -1 35      J 44
Mm
73 9
7.5
37 1
?84
170
79
14 3
15 7
16 0
T5 5
15 4
159
Mu
209
21 7
22 1
232
21 9
20 4
T84
18 3
19 5
IS 4
19 7
2*9
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P7 ReJaf/te Hi/rmdtfy af Sedeft? SfaPwl (>t>%) (Raw Data nefafe gup Ming)
June 2009
-ear          Jan      Feb      Mir      Apr     May     Jun 1   Jul       Aug      Sep      Oet       Nov      Dec 1—-—
1987
80          00         69        58
i9as 63 80 58 52 70 70 89 84 03 76 63 50
1909 51 53 67 62 68 80 83 85 84 72 64 75
1990 59 62 56 63 70 79 82 80 60 70 69 60
1991 55 46 55 67 76 80 82 64 77 71 65 65
1992 68 65 56 62 66 75 77 81 74 72 69 64
1993
IBS*
1995
53         46         48         57        78         83          65          72         81          81
ne        SI
46         50         51         59        72         75          85          63         78          69          69          67 1996        59        54         63        62       75         82          63          84          60          72          66          64
1997        63
1998 65 55
64
1999        59         50         49         55         76         75          04           84          80          78
64          63
2000        58
82          84          82          60          74        70
2001 62 62 65 65 73 83 84 84 63 80 74 67
2002        69         60         66         65        67         0-          85          66          83
2003 62 55 63 60 57 8t 08 86 64 73 69 61
2004         6i          54         56         62        SB        81          85          84          82          74          7C         69
Akingc 60 57 58 61 70 78 84 63 8T 69 63 60
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OS iVjraJ Speed at Jirrrma Station (Raw Data before gap filling)
June 2009
Year Jin         Feb Mwch April Maj June
July Aug Stpi Oct
Nov
1973
i97a
1975 197& 1977
1976 19?9 1980 1901
. 1902 *963 1954 ’90-5 1986 1907
i960 * 9B9 1990
1991 1992 1993 199a 1995
-996 1997
1908 1999 200C 2001 2002 2003 2004
OS        08         0 9
09
11
06
09
09        1 1        1 2        09        1 1       0 9       09
08         0 9
09          09
09         1 2        0 0        1 3       1 4       0 9       08         08         09         0 0         0 0         08 0 8        07         1 0        1 0        09       09        08         09         09          09         0 0         0 ■ 07         06         09         09        1 0       OS       06         09         09          08         0 7         0 8 0 7        00         1 2        1 1       0.9       09        07         08          09         08          1 0         00 77
09        0 8        0 9        00        0.6       0 9       0 7        06          00          07         06
07         03         00         09        0 0       0 7        0?         0 7        0 7         06         06          0 6
0 7        OB         09         07        D8       08         oe         07         06          06         0 5          0 6
0.7        0 6        00         OB        08       07         06         06         0 7         06         06          0 5
06         00        OB        0 7        07      0.7        06         06         06         0 6         0 6         O 6
*          <■         -B         06       06         05         06          06         06          0 5         06
06
05        OB      0 7         06        06       05        0.5         05         05          04         0 3         0 3 05        0 5         06         06        05       05        0 5        04          04         0 3         0 2          0 3 0 1        0 1         02        0 2        0.2       01        0 1        0 1         0 1         0 1         0 1         0 1 0 1        0 T        0 1        0 1       0.1      01        0 1         01         C 1        0 1         0 1         00 51 05         06         06         06        06       o.e        05         06          06          06          06
01        0 1         0 t         0 1       0 1       02        0 1        □ 1        0 1         0 1         0 1         0 1 06         06         07         07        07      06         05         05         06          0 5         0 5         0 5 0.5        0 5        0 6        □ 6        05       05        0 5         05         0 5         0 5          06          DS 0 t        0 1        04       0 2       0 3     0 1       01         0 1         02          0 1         0 1         0 1 04        0.8        06         0.5        05       04         04         04          04          04          04          □ 5 04         05         06         0 5       0 4       04         04         04          04          04          04          04 0 4        05         0.5         05         05       04         04         04          04          04          0 3          04
04         04         0.5        0.5        04        0 5       0 3         03          04          04          0 3
0 3        0 3        C 3        03         03       0 3       0 3         02         0 2         0 2         0 2          02
02         03         0 3         03         03       0 3        02         0 3         0 3         0 2         0 2          02
02         03         0 3         03         03       0 3        02         02         03           02          0 2          02
C 1 02 02 02 03 0 2 0 1 02 0 2 0 1 0 1 0 1 0 1 01 0 2 02 01 03 0 10 0 11 0 09 0 18 0 19 0 18
AtrCfWt
CV
SiFW
Mix
Ml ft
fV 0 52      0 62       0 72      0 73      0 75    0 74       071        0 70      0 82       0 82       0 83       0 59 0 52        05       0*4       044      0 42    0 36       036       0 35      0 33       0 34       0 32       0.29
-0 04      0 16         0 1      0 29      0 63         -0      -0 1           -0      0 02          0 3       0 31        0 00 09        1 2        1.2       i 3       1.4       09       0 9          09         09         1 1          1 0         0 9
0 1        0 1         0.1        0 1        0 1       0 1       0 1         0 1        0 1         0 1         0 1         0 1
Water Works Design & Supervision Enterprise
tn lUsodation with IntcrcoDdnoiUl ConsultuU ud Technocrats Pvt Ltd
53
s
1Arji-Dcdess* Hydropower £ irflEition Project Meiaorologfcal & Bydrolo^cal Feasibility Saidies
£33 S jiwntfre Dufatton at Bcdete Station (Raw data collected)
June 2009
(m rwday)
Year
'907 igaa
Jan       Feb       Mar      Apr      NUy      Jun        Jul        Aug
Sep       OCI        Nov      Dec
79         72        0.9        05        5 6         B          S3          57         84           0          8 3        8 3
93         7 1        6 5        8 2       79       64         2 5          42         5 1
97        9 5
1989
1990 89 56 27 64 8 2 64 38 4 8 0 96 8 7 9
1991 79 e i 6 0 63 7 i d 5 2 7 34 59 0 84 7
AS        0 2        79         79        7 4         6           30          5 1         6 5         79         8 8        6 4
1992
,_
5?        7 7        7 1        Bi       6 i           M           22         6 7        6 2         62         8 3
>S6G      76         66        7 S       5 5
1994 7 7 75 7 7 76 - 2 4 34 5a 9 5 8 4 9 3
1995       88         66         77         Sfi         ■1                       ■
1995
*           w         79          B
-
■           ■■
37 4 3 6 7 9
79          70
*997 72 92 7 S 58 7 6 t 4 1 46 84 76 6 7 6 3
<?96 7 5 7.7 64 07 6 4 67 2 9 3.3 4 7 5 4 84 9 2
*999
2000
2001
20C2
8 1        9 1        8 8        7 6        76        e.6         35          4.e         66         5 6         9 6        0 8
*
7
88 9 61 78 a
■
»          ■■■        55        6 4
82        7 5        91        8 4        6 1         56          3 1         6 9         88          8 3
75
2003 79 06 7 3 8 8 96 57 29 36 6 1 95 87 88
2004 75 79 5 57 74 4 3 4 2 4 5 35 82 83 77
Ar«r»9»
Bi
78
75
73
76
61
37
4f
62
79
03
03
I
Water Wcirfca Design & Supervision Enterprise
In Assocktdvn wttb imerr&ntiiiratil Consiliums fwd Tectuomit? PH. ltd.
54Arjo Detlessa Sylropower & IrrljjatiQn Project Meteorological & Hydrological Feasibility Studies
Annex E               Hydro logical Data
June 2009
E l tjsr of Sheeted
s
ho
Sutton
No.
Qwerveton Sfatwns
Latitude. N       Longitude, E
Station Name
Catch.
Area
(knt’l
Period
1     114001      □eciessa near Arjo
Deg Min. Ocg. Min,
00        41        36         25
2
T
114002     Angar near Nekemt 114005      Da&ana near Abasma
09          30 |      36
09        02
36 L
35
I
03
4     114007      Angar near Gulin
----- —
5     114008      t‘ebu. ai Yetu
07        48         36
1
42
6
114009
Urgessa near Gembe                  07        50
-------
36
39
9901         1960-2004 3742        1994-2004
2BB1        1962-1984
29           1999'2003
47           1979-2004
19          1979-2004
7
114013
Daoang near Bunno Bedelle       08
24        36
47
B
114014      Deaessa near Demb. (Totia)       DB
03        36
17
27
1806
0
^10
114016      Loko near hMtecm
09
07
22
51
36
375
1984-2003
1985-2003
---------------- -—
1997-2004
114019
113004
Ttmssa near Agaro
36
35        47 5         1969-2004
L------------”-------
11
MeSke near Guaer
OB         51
37
1998-2004
T2 113035 mans near Guder
13    101006     Jka at Uka
08
56
37
44
IW
45 111
08
ID 1
35
22
52 5
14    091008      Gilgeigmbe near Asenaaoo         07        45        37
11
2966
15
091012
Gojeb near Shebe                   I07
25
36
1”
3577
1985-2004
1980-2004
1967-2004
- ------------ 1970-2004
J-—-IArjft-tted«Asa Hydfopvtter & irrigation Project Meteorolcpgical & Hydrological Feasibility Studies
Annex E2 Mean Monrrny Streamflow at D&fessan near Arp Staten
tM.JTron m3) (Raw da!ii before pnoceisffigj
June 3009
Year
Jin
Fee
Mar
Apr
Ma
Jun
Jul
Aug .     Sep
Oct       Nov
Dec
v
1960
1961
1962
1963
1964
1965
1966
1967
I960
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
i960
1961
198?
1983
1984
1985
1986
1987
^988
1989
1990
1991
1992
1993
*994
1054        1124 K            -            -
51.6    44 Q    37 5    94 9                   286       1176       1613        1503      1304        200         177 5. 58 1     29 8     28 4            a.        ■r                  622         930        1170        655        107          55 9 IB 1      193     17 9    42 7  147 1       324         672       1370        1040        374       184         170 3
38 2
230        1W9       1301        1178      1337        205          73 6
55 4     25 3     16 4    4? 8    27 fl      160         034      1051          685        057        320         157 0 71 0     63 4     57 7    74 1     62 5 -                    857       1085        1212 -
22 7     204 _
96 0     53 &    31 4
708       1260       1201       1260        459         210 4
-■            *                              -
130          «7
50 9     46 7    67 1     39 7    73 2       349         950      1421          944        291          89          46 2
34 1 *          a               ■             45.3      28S         929 -
a                   101           62 1
37 0 164 109 12 5 53 5 241 823 1175 IMS 752 304 105 3l
52 4 29 8 196 35 7 564 118 803 1237 71« 209 117 52 5
259     11 2      4 7        6 3 109 3       250 -              -
365     1K2    14 4      9 1     93 7      261         641       £278- ,24'5     21 9    11 5 -          -■        -           -              -
48 3     37 fl     34 7            -          -            -
1401 592 149 64 0
119          46 9
151          89 5
-
25 9    18 1    12 7 -          -
-
324         129 7
55 5     201 ■              124    80 1 -           -              -
-              22 9    45 4       130         533         826          619        262         94          44 0 18 0      153      100    68 6  190 9       504         914       1288        1244        393       103          92 5
80 0     43 4     43 3     354    53 7         53 -
-
59 B 302 28 6 193 4&7 2aa 707 947 692 761 177 94 5 434 31 7 34 1 23 3 52 4 153 566 1139 1116 1231 255 121 3 385 16 7 11 9 95 26 6 185 703 655 521 i3i-
12 0      5 4        26    11 8     524      169         408        927          842        260          79          45 0 176       9 5    16 1      138    12 8        H9         452        491          732         222-
130 55 12 4 17 3 36 7 - - -
40 5 27 5 2*6      7 7    37 0       200         555
873 386 150 67 a
109
-
23 3 20 4    33 5    27 1       121         273        499       1Q07 53 5 30 0 33 8     609    42 0      157         343 -
--
---
543       1143-
10? 123 1
38 1
24 5 23 9         *3 8 20 7         56 5      161         268         K<         564        806       164          734
42 5 27 9 24 4 54 7              W5 2       312         600       1159         631        407        177          63 31
391 196 155 157 59 7 220 534 1221 B58 156 68 36 y
Water Works Design & SujwrrisloD Enterprise
to AsswrliOno with [nt e rod Un tn u] GonsuJtints and Technocrats Ptl Ltd
56Arj o Dfd ess* Hydropower & Irrigation Project Meteorological & Hydrological Feasibility Studies
E2:           Continued)
JnneW9
Year
Jan      Feti
Mar
Apr
May
Jun     Jul
Aug      f5ep       tact      |no»    |d«c
1995
1996
1997
19M
1999
2000 2001 2002
2003
2004
20 4     122       ns    194    38 3       S3        225       569        4&5        156       60
■         •          ■            30 4 141 8      373        723
596 -            -
----
-■ - »
87 2
41 4     190
-•
--
--
—i
.1          ■ -
A          ■-
4         ■»
*
-
242        135 T
85 1    59 5   661     57.2 120 3      401        740     TG45      1005      674      215       111 7 990   67 2   55 3   63 4   462       175        457       591        578       211       115        83 91 564    362     562    74 3   46 0      120-                    652                             ■
52.3    40.2    303    28 7   65.2      202        526       639        643       536       140-
C¥
Skew
Mu
452    287    2fi.fi    33.2   66 5     2Z3        654      1007        889      561       177        9Q.9j 047    0S2    0.65   0.71   0.59     0.46       0.34       0.30        032      0 SB     0.51        O’.sol
0.66    0 65    1-14   0.94   1.54     074       a.22     -0.16       0.43      Q.73     1.26          1.00 99.0   63.4   67.1    94.9 180.9   503.5 1176.1 1612.8       1502.5 1337.4    459 2        210,4
120      5.4     2.6     6.3   12.9     sia       225 0    491.1     4859     130.8     59.9         36.9| Mean annual flaw ■ 3821 Mm3;
]
Water Works Design & Supervision Enterprise
In AisotlsUon with lnter«otii)flit*i Coqisuliuta ud Tectuiocnus Pn Ltd.
5?Arjo-Dedessa Hydro jmwer & Irrigation Project
MeteorolOEicaJ & Hydrological Feasibility Studies
£3 39 Mean Montn^y Stream fie* at Detfessan near Dem&i Sfatwxn
(MtJfton m3} (jap firtoo s&nesj
June 2009
Year
Jan [ Feb         Mar
Apr 1 May
Jun        Jul         Aug           Sep |   Oct !      Nom        Oe-c
1965
1986
1907
3900
1909
1990
1991
1992
1993
1S94
1995
1996
199?
1990
1999
2000
200’-
2002
2003
2004
04        37        42       76     266        92           63        165         302        272      70 2        21 9
85        55       97       04       94        56        262        206         29$          67      22 9          115
5 9       45       97       92     106      105        243        34?         210         ItM     44 1       27 11 179     157    12 5       64    23 9      153        217        392         409         142       52 0          168
11 0       76      4 5     IT 5       02        31         167        253         272        142      24 0         13 8 10 3       50       56    22 7       99        52        252        564         362        126      20 9           94
7 2      6 3      6.6    12 5    29 5        76         305        522         263       14C       134            09 78     153     129      88     366        70        130         269         103        216      45.2        17 1
11 2    17 2     166    37 6     006      252        334         376        204        110      46 7         14 7 123    13 5    16 0     225    37 0      112         274        301         2B2          59      26 6        16 < 12 9    12 1    >6 5    23 fi    46 7        07         190        272         331        101       325        33 7
129       94    16 5    23 6     406        07         193       272       331        101      32 5        33 7 21 2       na     212    30 1    55.3      142         219        343         204        262       160        56 1 20 1      136    2D3    12 7    31 1      110         272        415        299        32$      80 0         21 i
no       65       53       95     549      146 1     242        245         214        302      40 4         18 3
10 2       5G       45       97    41 2      119        290        309         242        209      02 0        21 9
127       96    11 J    14 5     555      226         330        322         296        212      59 6        22 5
65       69       66      9.0       65        63        192         255         195          66      27 7        14 9
7 4        40       42    24 0       67        59        241         223         324          02      20 3          100
13 0    13 0     137    33 0     055      190         200        206         145          39      *0 0         1&8
Avorege CV
Sfcew
Maa
Aftn
12 2     947    T1 5     169     M4  112 4     232 4     316.9         273     154 3     48 4         20 5 0*7     0 46    0 40   O 56    0 69   0 526        0.27     0 326        0 26    0 56T      0 01         0 53
1 35    0.31      047   0 81    0 63   1 02fl       -0 47      0 W7        0 69     0 606         26        1 9B 28 t      772     232    37 0    98 5      352        334         564         4#9        329    187 9        56 1
5$      3 7      4 2      64      6 5        31           83        T65         T45          39      13 4          0.9
Mean annual flow ■ 1255 Mm3,.
Water Works Design & Supervision Enterprise
In Association with InterccnCnrut*! Consultants mH Tecbnocmis Pvt Ltd
5»Arjo Dedessa Hydropower 4 Irrigation Project Meteorological & Hydrological Feasibility Studies
£4 Annua) Maximum Floods
(tn m3/s)
June 2OD9
Year
AW ArJO
Upper
OwfeHJ 
ri#*r DfFl&i
nw
AJm-ufm
GJTpei Gfti'tae n«r
AjrrtfaCw
rrew SM(>*
A^jr 0Mf
neQfffti*
[.an-jf-ji* nejr
GufiMT
1
2
3
4
5
6
7
B
9
10
11
12
13
14
15
16
17
18
T9
20
21
22
23
24
25
26
27
2ft
29
30
633
1173
093
709
050
9S1
B14
1155
781
634
096
721
490
645
654
1083
369
400
502
574
771
750
646
804
353
525
525
744
312
601
213
206
212
243
354
220
20C
151
189
262
184
175
226
175
211
244
271
300
370
267
467
264
434
449
247
196
257
180
314
341
230
202
240
151           132 198           272 130        176 330           127 151           231 167           no 205           116
160
129
140
151
223
135
149
119
92
96
127
143
05
121
247
86
106
192
237
159
255
10Q
174
339          i6B 185         258 186         241 284         217
214
140
249
177
288
138
297
314
184
ISO
203
226
132
345
366
164
164
251
164
150
282
132
193
199
439
236
335
361
209
247
256
157
271
252
12B
141
73
55
124
107
134
105
125
142
s 136
142
149
176
172
109
106
79
10i
123
Water Works Design & Supervision Enterprise
In Association with Intercontinental Consultants and Technocrats Pvt. Ltd.
59Arjo Oedessa Hydropower & Irrigation Project
MeteoroJogleaJ & Hydrological Feasibility Studies
£5 Measured Sediment CDrjcwiPator? ai ftetevartf Gat/grng Sfafjoru
June 2009
Field No       sample
No
Lab No  River 1 Slream
Station
Dale 8 T ime
ol Sampling
Time
(Sec i
f—------ —1 G/he»gN    Flow
(m)
Sedrmen!
Deplh Width Concen
(m)          im)         lmgj‘l)
Remaik?
AV
4B4        1                        Dedessa         Toba       15-Mar-90
0 43
485        2                        Dedessa         Toba        15 Mar.90                   043
486        3                        Dedessa          loba        IS-Mar-90                   043
664         1                        Dedessa          Toba       21 Mar 90                   050
665        2                        Dedessa         Toba        21 Mat'90                   0.50
666         3                        Oedessa         Toba       21'Mar-90                   0 50
1057       1
Dedessa           Toba         2-Jut-90
1 81
1058 2 Dedessa loba 2 Jut 90 1 fl1
1059       3                        Dedessa          loba          2 Jul-90                     1 81
1190       1                        Dedessa         Toba       22 Doc-90      50        0 40
1191       2                        Dedessa         Toba       22 Dec-90       50        0 40
1192       3                        Dedessa         Toba       22 Dee-90      50        0 40
1223       1                        Dedessa         Toba       18 Sep-90                   2 46
1224       2                        Dedessa         Toba       18-Sep-90                  2 46
1225       3                        Dedessa          loba        18 Sep-90                  2 46
2698        1                        Dedessa         Toba        l6-May-93       45        0 46
2699       2                        Dedessa         Toba       16-May-93      45        0 46
2700       3                        Dedessa         Toba       16-May 93      40        0 46
2704       1                        Dedessa         Toba       12-Apc-93                   0 64
2705       2                        Dedessa          loba        12- Apr-93                   064
2706       3                        Dedessa         Toba        12-Apr 93                   0 64
4 16         0 26               69 4 16         0 70            13 8 4 16         036            20 7 541          054               70
541         0 80            14 0
541         0 39             6 1
9 14         8 40               66
9 14         8 00            13 3 9 14         7 00            19 9
4 37         0 43              7.0
4 37         0 74            14 0
4 37         0 46            21 0
98 50
98 50
98 50
2 89             0 66       19 5
2 89             061           65
2 89              071         130
8 01
8 01
8 01
51 56
40.00
42 81
59 69
173 13
90 63
215 31
135 62
190 00
90 94
99 37
63 13
141 56
187 82
124 69
87 90
108 63
81 40
73 05     64 61
61 59
59 20Arjo Dcdesu Hydrapower 4 Irrigation Project Meteorological & Hydrological Feasibility Studies
El          j tfrttrumjj
June 2009
MO.
Field
sample
No
Lab.No
River J
Stream
Station
i-------------- r
Date  &  lime   Time   Grheighl
Ftow        Depth
J
of Sampliry (Sec) . (m) |m /s|
(m)
Width
(ml
Sediment
Concert Remarks (mg/1)             AV
541         1       179/04      Dedessa          Arjo        10 Aug 04       30        2 45
542 2 Dedessa Arjo 10-Aug 04 26 2 45
M3         3
Odessa           Arjo        10-Aufl-04      28        2 45
544        1       100/04       Dedewa           Arp         11 Aug 04      32        2 56
545        2                        Dedessa          Arjo        11 -Aug 04      28       2 56
546        3                        Dedessa          Aijo          11-Aug-04      27        256
559        1       185/04       Odessa          Ai jo         1 Sep-04       29       3 61
560        2                        Dedessa           Alp          1-Sep-04       28       3 61
561         3                         Odessa           Arp         1-Sep-D4       29       3 61
143 12 9 05ft 17 5
143 12       9 1ft        35 0
143 12       9 5ft        52 5
196.11         lift           160
196 11       9 6ft        36 0
196 11       9 6ft        54 0
611 23      137 ft        180
611 23      14 3ft       37 0
611 23 1 46ft 55 0
1417 50
1739 74
1740 74
1652 66
1718 12
1639 31
1360 22
1328 61
1438 44
-
Water Works Design & Supervision Enterprise
In Association with lolercontioeDUl Consultants and Technocrats Pvt Ltd
61Arjo DtdfSMi Hydropower & lrrl£»tl<)Ti Project
Meteorologi
cal&Hydro logtea]
Feasibility Studies
Judo ZOOS
/Inflex F
Routing of P
MF Hydrograpn
Time
Hydra
hours
Cumecs
ODO
105 00
1 50
134 66
IOC
163 33
4 50
192 00
800
214 44
7 50
236 6B
9 00
2 59 31
10 50
339 50
12 00
419 69
13 50
499 68
15 00
813 55
15 50
727 22
10 DO
B40 89
19 40
902 65
21 00
1084 CO
22 50
1134 00
24 00
*1204 OO
25 50
1374 DO
27 00
1564 00
28 50
1694 OO
50 00
1804 OO
31 50
2D44 CO
33 00
2144 00
34 50
2274 OO
36 00
2304 OO
37 50
2494.00
39 00
2674 OO
40 50
2764 00
42 00
2829.00
43 50
2851 OC
45 00
3106 00
46 50
28M 34
48 00
2648 68
43 5D
2826 00
51 00
2769 34
52 50
2710 68
54 00
2656 00
55 50
2552 00
57 00
2448 00
58 50
2344 00
8C OC
2227 34
6’ 50
211068
63.00
1994 00
64 50
1946 00
66 00
1898 00
Water Works Design & Supervision Enterprise
Id AssotiAUoD with tatercoutiiiuiul CoQsulunts and Technocrats Pw. Ltd.
62Aijo-Dedesu Hydropower 4 Irrigation Project
Meteorological Si Hydrological Feasibility Stu lies
Time                               Hydro
j um 2009
Hours
Cumecs
67 50
1050 00
69 00
1736 00
70 50
1626 00
72 00
1514 00
73 50
1459 34
75 00
1404 68
76 50
1350 00
76 00
1279 00
79 50
1206 00
01 00
1137 00
32 50
1090 00
64 00
1043 ac
65 50
996 00
07QC
970 67
80 50
961 34
90 00
944 OC
9i 50
909 63
93 00
875 26
94 50
840 09
96Q0
824 60
97 50
8D8 31
99 00
794 OC
100 50
776.34
102 00
758 68
10350
741 00
105 00
725 34
106 50
709 6S
100 00
694 00
109 50
677 34
111 00
664 60
112 50
644 00
114 00
62? 34
116 50
610 34
117 00
594 03
118 50
577 34
120.00
WO 60
121 50
544 00
123 00
527 34
124 50
510 68
126.00
494 00
127 50
474.00
129 00
464 00
130 50
434 00
132 00
421 00
133 50
400.00
135 00
395 OO
136 50
304 00
Water Works Design & Supervision Enterprise
In Asstjcliitf on with lDtercoTitinentaJ Consultants and Technocrats Pvt Ltd.Hrdrojwwer & Irrigation Project
Meteorolajfical & HydrcJc^cal Feaslbtllty Studies
Time                            Hydro
June 3009
hours
Cumecs
138 OO
374 00
139 50
364 DC
141 30
350 67
142 50
337 34
144 00
324 00
145 50
314 00
147 00
304 00
140 50
294 00
150 00
277 40
151 50
260.60
153 00
244 00
154 50
224 00
150 00
204 oa
157 50
184 00
159 00
168 39
160 50
154 66
-62 00
137 00
163 50
136 00
165 00
135 00
-66 50
134 00
168 00
133 00
'69 50
132 00
171 00
131 00
172.50
130 00
174 00
129 00
175 50
128 00
177 00
116 60
178 50
115 34
180 00
124
181 50
122 67
183 00
121 34
184 50
120 00
1BED0
11867
187 50
117 34
189 00
116 00
190 50
1,15 00
192 00
114 00
193 50
113.00
195 00
111 00
196 50
109 00
198 00
107 00
199 50
1O6 9O
201 00
106 50
202 50
106 00
Water Worts Deaign & Supervision Enterprise
In AttMiiiBfti trith InurtoniwaifittJ Cgiuultimts and Tethnocrats Pvt Ltd.
64Arjo OeflesM Hydropower & Irrigation Project
Meieo rological & Hydrological Feasibility Studies
of 125 meters tong
0=2 2’125'H power 1 5 HEAD^m} Oijci'arge in curnecs
0 00                         DOO 0 25                         34 38 0 50                         97 23 0 75                       178 62
1 00                       275 00
June?009
125
384 32
150
505 21
175
636 63
2 00
777 82
2 25
926 13
250
1087 03
2 75
1254 10
300
1428 §4
3.25
1611 23
X
T-1 50 SiT’H3j7 CURVE               Hours
Eevstjan
Storage
QQ
S/T
m
Mcum
Cumecs
Cumecs
1376 30
3679 20
000
581333 33
1376 25
3715 85
1? 19
580120.37
1376 50
3752 50
40.62
694907.41
1376 75
3769 15
8931
701694 44
1377 00
3625.80
137 50
708481 40
1377 25
3863 15
192 16
715398.15
1377 50
3900 05
252 61
722231 48
1377 75
393? 65
3ta is
729231 48
1378 00
3975.20
388 91
736148 15
1376 25
-102? 28
464 07
745792 59
1376 50
4089 36
543 52
757266 69
1378 78
4 IOC 44
627 05
759340 74
1379 00
4127 50
714 47
764351 85
1379 25
4166 20
805 62
771518 52
1379 50
4204 90
900 34
778685 19
1379 75
4243 60
990 51
785851 85
13BD00
4282 30
1100 00
793018 52
Water Works Design & Supervision Enterprise
65
Ln Association with Intercontinental Consultants and Technocrats PtL LtdArjo Dedessa Hydropower & Irrl^atJott Project Meteorological & Hydrological Feasibility Studies
FLOOD ROUTING
June 2003
Time
inrtcrw
Mean
srroo
Hrs
Cumecs
Cumecs
Cumecs
000
106 CO
ooo
1 50
134 66
120 33
695587 41
300
163 33
149 00
695601 55
-1 50
192 00
177 67
695643 84
6 0C
214 44
203 22
695713 96
7 50
236 36
225 66
695008 49
9 00
259 31
248 10
095924 07
tO 50
339 50
299 41
696060 44
12.00
419 69
379 60
696245 86
13 50
499 86
459 79
696508 34
15 00
613 55
556 72
896846 91
16 50
727 22
670 39
897277 22
16 00
840 89
784 06
697814 72
19 50
962 65
911 77
698458 12
21 00
1084 00
1033 33
699220.04
2250
1134 00
1109 00
700092 99
24 00
1284 00
1209 00
70,1030 31
25 50
1374 00
1329 00
702054 26
27 00
1564 DO
1479 00
703182 09
23 50
1694 00
1639 00
704441 90
30 00
1804 00
1749 00
705841 68
31 50
2044 00
1924 00
707330 18
33 00
2'4-4 00
2094 00
708989.22
34 SO
2274 00
2209 00
710749 89
36 00
2384 00
2329 00
7126:5.64
37 50
2494 00
2439.00
714570.64
39 00
2874 00
2584 00
716600 42
40 SO
2764 00
2719 00
718737 08
42.00
2829 00
2796 50
720966 90
43 50
2861 OC
2845 00
723236 41
45 00
3106 00
2903 50
725509 42
46 50
2871 34
2988 87
727676 18
40 00
2848 60
2860 G1
730201 86
49 60
2826 00
2837 34
732354 41
51 OC
2769 34
2797 67
734441 16
52 50
2710 68
2740 01
736450 16
54 00
2856 00
2683 34
736371 32
55 50
2552 00
28O4O0
740206 90
57 00
2440 00
2500 00
741936 14
56 50
2344 00
2396 00
743536 16
60 30
2227 34
2285 67
^45009 05
61 50
2H0 68
2169 01
746352 34
63 00
;994 OO
2052 34
747562 13
64 50
194600
1970 OC
74864Q 25
66 00
1898 00
1922 00
749622 36
Water Works Design & Supervision Enterprise
In Association with lnterccnttaeotaJ Consultants and Technocrats Pn. Ltd.
66Arjo-Dcdtssa Hydropower & Irrigation Project Meteorological & Hydrological Feasibility Studies
June 2OOT
Time
inflow
Mean
srr-o/2
Hrs
Cumecs
Cumecs
Cumecs
67 50
1050 00
1674 OO
750543 54
69 OQ
1738 00
1794 OO
751404 94
70 5G
1626 00
1682 00
752175 51
72 OO
1514 00
157Q QO
752825 04
71 50
1459.34
1486 67
753355 20
7500
1404 68
1432 01
753795 89
76 50
1350 00
1377 34
754176 62
76 00
1279 00
1314 60
754496 21
79 50
1208 00
124350
754753 40
81 00
1137 00
1172 50
754935 07
82 50
1090 00
1113 50
755044 21
84 00
"043 00
1066 50
755093 67
85 50
996 00
1019 50
755096 TO
87 00
978 67
907 34
755052 13
80 50
961 34
970 01
754977 05
90 00
944 00
952 67
754B85 91
91 50
909 63
926 62
75477892
93 00
875 26
692 45
754847 89
94 50
840.89
058 08
754484 77
96 00
824 60
632 75
754289 99
97 50
808 31
616 46
754072 90
99 00
794 00
601 16
753842 72
100 50
776.34
785 i?
753600 62
102 00
750.88
767 51
753345 07
103 50
741 00
749 64
753077 60
105 00
725 34
733 17
752795 38
106 50
709 66
717 51
752500 60
10800
694 00
701 84
752194 42
109 50
677 34
685 67
752896 26
111 OO
664 88
671.01
752587 24
112 50
644 00
654 34
752228 21
114 00
627 34
635 67
751877 33
115 50
610 34
618 84
751512 79
11700
594 00
602 17
75H36 59
110 50
577 34
566 67
750749 03
120 00
560 68
569.01
750350 45
121 50
544 00
552 34
749940 84
123 00
527 34
535 67
749520 33
124 50
510.68
519.01
749089 07
126 00
494 00
502 34
748647 22
127 50
474 OO
484 DO
748194 90
129 00
454 00
464 00
747730 63
’30 50
434 00
444 00
747252 91
132 00
421 00
427 50
74676’. 94
Water Works Design & Supervision Enterprise
In Association with Intercontinental Consultants and Technocrats Ptl Ltd.
67Arjg ftedcssa Hydropower A Irrigation ProJ&et Meteorological£ Hydrological Feasibility Studies
June 2009
Rfl L ti ng of p M F H yd ro g ra p htflnflow and Out F low
hydrographs
Tima in hour®
Water Works Design & Superrislon EowrpfUe
Id Association with interoonuneDUl Consultwnfs ud Twtaocnm Ptl Ltd.
6HAijo Dede$&& Hydropower & Irrigation Project Meteorological & Hydrological FeulMllty Studies
Annex G Ago Coffer Dam Outflow Routings
level (mj Discharge Cumecs
1324 5                   0
1327
1330
1333
1336
1339
49 02
147 8
103 75
213 72
2aC
inflow Hydrograpon
100 year return Pe<»od
Pean Direa Run Off 071 cumecs Baseflciw=169 80 Cumecs 
Time to Peax-45 hovrs
0 00 pmes August Mean Discharge
Shape developed &y US0R Dimens*J<tiess Hydrograph Pean ot Flood Hyorograph= 1040 00 cumecs
JSB-R Hydrograph
A                    Routing cf TOO-year FkxK
HEADtmj Discharge n cumecs
0C
25
49.07
55
147 0
85
103 75
115
213 72
14 5
240
&T*CM CURVE             T=1 QPhours
Elevation
Sicxage
Meum
Ch'2
Cumecs
ST
m
SZT-»0r2
Cumecs
Cumecs
O
Cumecs
1324 5
12 95
0
3597.222
3597 222
1327
0
31 9
24 935
0861 111
8605 046
49 87
1330
57 4
73 9
18722 22
1333
10796 12
147 8
115
91 875
32777 78
32869 65
1336
192 5
>83 75
106 66
63472 22
53579 08
1339
291 3
213 72
120
80916 87
01036 67
240
Water Works Design & Supervision Enterprise
In Association with Intercontinental Consultants and Technocrats Pn. Ltd.
69Arjo-Wessa hydropower & Irri£atlt)D Project Meteorological & Hydrological Feasibility Studies
June 2009
Tune
Inflow
Mea/i
S7T-QZ2
Mrs
Cumecs
Cumecs
Cumecs
Otn Flow               Level Cumecs             Cumecs               Meters
0
169 5
27267 14
169 6              133’ 81
1
176 65
173 225
27117 54
2
164 11
10O4B
27121 27
3
191 36
187 735
27132 22
4
198 6
194 98
27150 18
5
205 86
202 23
27175 7?
6
21311
209 485
27200 23
7
220 36
216 735
27247 89
fl
227 6
223 9B
27294 66
9
234 93
231 265
27348 58
10
254 77
244 05
27409 61
11
274 61
264 69
£7404 03
12
294 45
2&4 53
27576 05
13
314 29
304.37
27691 62
’.4
334 13
32421
27824 69
15
353 97
344.05
27977 21
16
373 01
353 59
28149 13
17
39365
303 73
26340 4
10
413 49
403 5?
28550 97
19
444 45
426 97
26700 79
20
475 35
<59 9
29035 36
21
506 32
490 636
29320 13
22
537 22
521 77
29635 03
23
566 12
552 67
29979.98
24
607 09
587 605
30354 07
25
630 D6
618 575
30763 64
26
661 03
645 545
31202 27
27
692 2
576 615
31666 87
26
720 46
706 33
32160 66
29
748 32
734 39
32663 47
30
776 36
762 34
33233 32
31
804 44
790 4
33610 28
27290 77 169 4991 1331 811
27301 75            169 5271             1331 6’3
27319 95             159 5736            1331 6i7
27345 36             169 6385           1331 822
27377 95             159 72i 8            1331629
2741771 169 8233 133183fi
27454 63             169 9432           1331 848
27510 66             170 0812           1331 859
27579 85             170 2375           1331 872
27654 46 170 4201 1331 688
27748 72 170 6689 133’ 90B
27662 58             170 9597           1331 933
27995 99             171 3005           ’331 961
28145 9            171 6911           1331 994
28321.26 172 1314 1332 03
28513 02 172 6212 1332 07i
28724 13 173 1605 1332 116
26954 54 1737491 1332 165
29209 78 174 401 1332 22
29495 26 1751303 133228i
29810 96             175 9368           1332 348
3C156 8             176 6202           1332 422
30532 65             177 7803           l 337 502
30942 47             178 8271           1332 539
3'382 22              179 9504           1332 683
31647 61             181 1390           1332 782
32343 29 102 4054 1332 6BB
32067.21 183 7438 1332 999 33417 86 164 5433 1333 079 33995 66 185 3795 1333163 34600 58 186 255’. 1333 251
32
832 56
010 5
34414 42
35232 92
187 17           1333 342
33
660 56
B46 56
36045 75
34
608 62
674 59
35704 19
35
91660
902 65
36339 66
36
944 79
930 735
37102 16
37
955 43
950 11
37841 67
36
986 07
960 75
30599 46
39
970 71
971 39
39356 78
40
987 35
90203
40*43 81
41
997 99
992 67
40929 94
42
1OOB 63
1003 31
41725 76
43
1019 27
1013 95
42531 05
44
1029 91
1024 59
43345 8
45
1040 6
1035.255
44170
46
1032 64
t036 72
45OO3B5
47
1025 06
1026.95
45637 56
35892 31             188 1243           1333 438
36576 78            189 1177           1333 537
37292 31             190 1503            1333641
38032 89 191 2221 1333 740 38791 78 192 3203 1333058 39560 21 193 4324 1333 969
40336 17             194 5582          1334 082
41125 54             195 6978           1334 196
41922 61             196 8511           1334 311
42729 07 196 0182 1334 4?B
43545               199 199           1334 546
44370 39             200 3935           1334 666
45205 26             201 5017           1334 787
46040 37            202-8102           1334 900
46866 51 204 3058 1335 026
Water Works Design & Supervision Enterprise
In Association with lotenontinental Consultants and Technocrats Pvt. Ltd
70jVj(kOedes.si Hydropower & lrrlgititm Project Meteorological & Hydrological Feasibility Studies
June 2009
Time
Inflow
Mean
S/T-Q/2
S/T+QZ2            Out Flo*
Level
Hrs
Cumecs
Cumecs
Cumecs
48
101? 32
1021 19
46662 51
-19
iOOT 72
1013 52
47470 51
50
100' «
1005 04
40205 67
51
994 2
996 08
49004
52
906 44
990 32
49873 42
53
976 66
962 56
50653 95
54
970 8
974 74
51425 6
55
954 36
962 575
52168 32
55
037 9
946 125
52937B
5'
521 55
929 725
53669 91
58
905
9'3 275
54384 94
55
866 55
096 775
55082 65
60
872 1
880 325
55763.61
61
655 65
863 875
56427.28
Cumecs              Cumecs                Meiers
47683 7             205 1084            1335 146
48492 03             206 3582            1335 263
49291 51              20? 5152            1335 379
50082 08             208 6592            1335 493
50863 74             209 7904           1335 607
51636 51             210 9088           1335 719
52400 34             212 0142           1335 829
53150 9             213 10C3           1335 938
53883 92 214 0116 1336 033 54599 64 214 5968 1336 112
55298 22              2153654            1335 4 88
55976 62            216 0176           1336 262
56643 93             216 6534            1336335
57291 15             217 2729           1336 406
62
8392
847 425
57073.88
57921 31
217 070            1336 474
63
622 75
830 975
57703.43
64
804 46
013 505
58315.94
65
786 07
70S 265
58910 51
66
767 66
776 865
59486.2
67
749 27
750 465
60042.94
68
735 66
742575
00500 70
65
712 49
724 1«5
6:102.22
70
694 1
703 295
6 J.6D4 79
71
675 71
684 905
62086 01
72
657 36
666 535
62548 4
73
643 81
BSC 585
62991 99
74
630 26
637 035
63419.22
75
616 71
623 485
63832 51
76
603 16
609 935
64231 87
77
509 61
596 385
64617 3
76
576 06
002 035
64988 83
79
562 51
569 285
65346 47
80
540 96
555 735
65690 22
61
535 42
542 19
66020 12
82
525 74
530 58
66336 16
83
516 06
520 9
66640 3
64
506 38
511 22
56934 48
85
496 7
501 54
67218 71
86
407 02
66
87492 99
07
477 34
482 18
67757 35
06
467 86
<725
56011 78
69
457 98
462 82
68258 29
90
448 32
453 15
684909
91
440 58
444 46
6071562
92
432 84
436 71
68931 44
93
425.1
426 97
69139 32
94
417.36
421 23
69339 26
95
409.62
413.49
69531.29
96
401 88
405 ?5
69715 39
58534 4             210 4028          1336 541
59129 55             219 0324           1336 606
59705 70             219 5839           1336 669
60263 06             220 1173             1335 73
60801 41              220 0326           1336 789
61323 35             221 1321           1335 846
61826 4              221'6136           133E 901
62300 09 222 0746 1335 95* 62770 92 222 5170 1337 004 63214 93 222 9426 1337 053
63642 58             223 3519               1337 1
54056 36             223 7470           1337 145
64456             224 1304           1337 188
64841 8             224 4997           1337 231
65213 69             224 8556            1337271
65571 65             225 1983             T337 31
65915.75             225 5276           1337 340
66245 96             225B436           1337 384
66562.31              226 1464            1337419
66666 74             226 4378           1337 452
67161.2             226 7190           1337 484
674457             226 9919           1337 515
07720 25             227 2547           1337 645
67984 85             227 5079           1337 574
68239 53             227 7517           1337 602
58464 23               227 9859           *337 629
68719 11              220 2107           1337 654
68944 05               228 426           13J7 579
69160 07             228 6328           1337 702
69368 15             228 8319           1337 725
69568 29             229 0235           1337 747
69700 49             229 2074           1337 768
69944 76 229 3836 1337 703
70121 14 229 5526 1337 807
Watar
m K viinard
■ . iZtJ
Iclnri Fntarar
E»
In AMOcLition with InterconttnenUJ Consultants uid Technocrats Pvt Ltd-Arjo Dcdcssa Hydropower 4 Irrigation Project Meteorological & Hydrological Feasibility Studies
—
hineSfltfj
Ti<ne
inflow
Mean
S/T-Otf
^7*0/2
Out Fkrw
Hrs
Cumecs
Cumecs
Cumecs
Cumecs
386 4
Cumecs
Level
Meters
sa
390 27
70059 89
70450 18
229 8675
99
378 64
382 52
70220 29
1337 843
"0602 81
230 0136
1337 86
100
372 83
375 735
70372 8
70740 53
230 1531
101
367 02
369 925
7051B 3B
1337 876
70868 3
364 115
230 2869
361.21
70650 02
1337 891
102
71022 13
230415
1337 906-
103
355 4
358 305
70791 72
7H50 03
230 5374
104
349 59
352 495
70919 48
71271 98
1337 92
230 6541
105
343 70
346 585
71041 32
133? 933
71380 01
23C 705"
1337 946
106
337 99
340 085
71157 24
71498 13
230 8705
1337 95B
107
332 16
335 075
71267 26
71602 33
230 9703
71371 36
1337 969
100
326 35
329 255
71700 62
231 0644
1337 98
109
320 71
32353
71469.55
71793 08
231 1529
1337 99
110
316.67
318 69
71561 93
71080 62
231 2366
133B
111
311 83
314 25
71649 38
71963 63
231 3151
1338 009
112
306 99
30941
71732.32
72041 73
23i 3900
1338 017
113
302.15
304 57
71810 34
72114 91
231 4609
114
297 31
1338 025
299 73
7188345
72183 18
23i 5262
1338 033
115
292.47
294 89
71951 65
72246 54
231 5869
1338 04
116
287 63
290 05
72014 95
72305
231 6428
1338 046
117
282.83
285 23
72073 36
72358 59
231 6941
1338 052
11S
27963
201 23
72126 9
72408 13
231 7415
1338 057
119
276 43
278 03
72176 39
72454 42
231 7858
1338 062
120
273 23
274 03
72222 63
7249? 46
231 827
1338 087
121
270 03
271 63
7226563
72537 26
231 8651
133B 071
122
266 03
268 43
72305 4
72573 03
231 9001
1338 075
123
263 63
265 23
72341 93
72607 16
231 932
124
1 338 Q79
260 43
262 03
72375.22
72637 25
231 9608
125
1338 082
257 23
258 83
72405 29
72664 12
231 9865
133B 0B5
125
254 03
255 63
72432 14
72687 77
12?
232 0092
1338 088
250 83
252 43
72455 76
72708 19
232 0207
125
1338 09
247 63
249 23
72476 16
72725.39
129
232 0452
1338 092
244 43
246 03
72493 34
72739 37
232 0586
130
241 23
1338 093
242 83
72507 32
72750 15
232 0689
131
238 03
1338 095
239 63
72518 08
72757 71
132
232 0781
234.33
1330 095
236 43
72525.63
72762 06
133
232 0003
1338 396
231 63
233 23
72529 98
134
72783 21
232 0814
22043
1338 096
230 03
72531 13
72761 16
135
232 0794
225 23
1338 096
226 63
72529 00
136
72755 91
232 0744
1338 095
222 03
223 63
72523 84
137
72747 47
210 83
232 0663
1338 094
220 43
725154
136
72735 83
232 0552
215 63
1338 093
217 23
72503 77
139
72721
232 04’
1338 091
212 43
214 03
140
72488 96
72702 99
232 0237
209 23
1338 089
210 83
72470 97
141
72681 8
232 0035
206 03
1338 087
207 63
142
72449 6
72657 43
231 9801
1338 08*
202 83
204 43
143
72425 45
72629 80
231 9538
1338 084
199 63
201 23
72397 92
72599 15
231 9243
1338 078
Water Works Design & Supervision Enterprise
In ARSDciitton with IntcrcontioflntaL Cousultan ts and Technocrats Pvt, Ltd.
72AjJo Dcdessa Hydropower & Irrigation Project
Meteorological JL Hydrological Feasibility Studies
Pouting
fis actual Reservoff Area Survey 15 yel to be completed it IS better to go Up to 1339 OO mamsi
0                 169 6               169 6
10               25a 77         170 4281
20               475 35          1751303
30               776 36        1&5 3795
40               987 35         195 6976
June 2009
45
1040 6
201 60-17
50
1001 96
20? 5152
60
872 1
216 6534
70
694 1
222 0746
eo
546.96
225 6436
90
445 32
228 426
100
372 53
230 1531
110
31667
231 2366
120
273.23
231 627
130
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Summery

Project Overview

The Arjo Dedessa Hydropower & Irrigation Project is a major development initiative in Ethiopia's Dedessa sub-basin, which contributes 25-26% of the Abbay River flows. The project combines irrigation and hydropower generation, with comprehensive hydrological and meteorological studies completed in June 2009.

Key Findings

Hydrological Characteristics

Mean Annual Rainfall: 1,453 mm (ranging from 1,417 mm to 2,013 mm across stations)
Mean Annual Flow: 2,477 million m³ at dam site
Flow Variability: 63% of annual flow occurs May-September

Agro-climatic Data

Parameter	Annual Mean
Mean Temperature	22.51°C
Relative Humidity	75.51%
Wind Speed	0.71 m/sec
Reference Evapotranspiration	1,397 mm/year

Hydropower Potential

FRL (m amsl)	Firm Power (MW)	Installed Capacity (MW)*
1356	5.97	9.95
1376	23.75	40.00

*Assuming plant factor of 0.6

Flood Analysis

Return Period (years)	Flood Peak (m³/sec)
100	871
1,000	1,303
10,000	1,948
PMF	3,000

Sedimentation

Mean annual sediment load: 0.775 million m³/year
Reservoir capacity reduction: 38.78 million m³ after 50 years
No interference with dam operation expected

Conclusions

The project is hydrologically feasible for both irrigation and hydropower
Optimal FRL identified at 1376 m amsl with 23.75 MW firm power
Downstream flow reduction is minimal (1.39%)
Water quality is suitable for irrigation and hydropower