Bl LATE RIVER BASIN DEVELOPMENT STUDY
x <•
VOLUME II
YDRO- METEOROLOGICAL DATA ■
-’■< ■
D. Jovanovic              civ. eng t Teclegiorgis Goitom   civ. eng
National Water Resources Commission
., . _ ■ -- -
Executive     Organ
Addis Ababa
July 1974
¥BILATE RIVER BASIN DEVELOPMENT STUDY
PRELIMINARY REPORT
VOLUME II HYDRO-METEOROLOGICAL DATA
D. Jovanovic civ. eng.
Teclegiorgis Goitom civ. eng.
National Water Resources Commission
Executive
Addis Ababa
July 19741
1
Introd metier.
The avail able hydrometeorological oaxa tne Bilate River Basin as well as zrc. neighbouring basins are compiled m zr.
seven meteorological stations within tne Bilate River catcn- ment with classes varying from two to four. There is r.c
single 1st class station in the Pilate drainsje basin. Tne summary of the meteorological static.-s .6 ete.r. ir. tie table on page two. Classification of meteorological stations is
as follows:
1st Class: Maximum and Minima., t .er .et  iry am . et-
bult thermometers, thermometer cr. oaro_eteri tner.to-gregh a..t hydrograph, intensity and standard ram- aages, aneroid 
c
barometer, solar thermometer black tan.., solar tner.tomete. silver tanu and ground thermometer, e.sneratien ran and anemometer, sunshine reccrc.cn, '.-.’inc am cloud ciservati. . and water temperature.
2nd Class: Maximum and Minimum tmr meters, try and ret
thermometers,        evaporation pan and ano- .ore ter ~ ..'.tensity and standard rain-       •gauges.
ard Class: Maximum and Minimum thermometers and standard raingauge.
4th Class: Standard rain-gauge.
Tnere are only two hydrological stations in the Bilate River Basin one is at Shashemene Sodao bridge, while -he other is at the Bilatentena Bridge. The '.laba 2elite Station has an automatic water level recorder and a cableway, where flow measurements have been conducted for three years only (as shown in the table on page41). The station at Bilatentena has only a staff gauge.
Detailed proposal for improving the hydrometeorological network in the Bilate catch.- ent will be given in the next stage of the study.
(I)SUMMARY OF METEOROLOGICAL GAUGING STATION?
k
r-
2
ELEVATION
ST.
N8
NAME OF STATION
GEOGRAPHICAL
I
REMARKS
LOCATION
1    (o) HOSSAINA                     -A"
Mor. 1, 1953
16
(1953-1968)
At    the
S
245 Kim. from Ao6s Ababo
(b) HOSSAINA                     -A-
TYPE       OF STATION
(Claes) 3 rd
3 rd
DATE OF
INSTALLATION
DURATION OF
RECORD                     OPERATING
(Yeors)
DESCRIPTION OF
STATION
LOCATION ]
DISTANCE OF STATION
FROM NEARBY TOWN OR VILlIgE
-------------- 1
Feb. 5, 1972
2
(1972-1973)
At
th*
I
IM
Kemboto
Mistion
2          (o) ALABA COLITO Ar
3 rd
gOd
2 rd
Jon.        1966
7
(1966-1972)
1
(1973)
(1972)
1
(1973)
ORGANIZATION
C.A.A
N W R.C
CAA
N.W R C
CAA
N W R.C
N W. R.C
CAA
CAA
CAA
07-32'
37*50'
07*32'
37" 51'
07*22*
3e*06'
07*22
38*06’
06-41'
38-01*
N
E
N
E
N
E
N
E
N
Synod
At
the
r
(b) ALABA COLITO -A"
J
Mor. 6, 1973
SIM
At the
SIM
315 Kai from Adon Ababa
3l5 Kim from Addis AboDo
3
4 | SHONE
1 BILATE AGR. ESTATE^
-A-
Mor 1971
E _1
4»h
Fob 7, 1973
5
8ILATEN TENA
A"
AT
1
4th
3 rd
3 rd
Jon. 29,1973
1 (1973)
Feb 1,1965
9
(1965-1973)
-I
07*20*
37*57'
06*58'
38*09'
07" 08’
37*59*
06"53'
38-00*
06-42'
37-56'
06-52*
37-44'
06-52'
37-44'
06-56*
38*17'
07-10*
38-26'
07*|5'
38*2|’
°7-4 *
N
E
N
E
N
E
N
E
N
E
K
E
N
E
N
E
N
E
N
E
68 Kmt. from Awosso
6 ABONSA
7           SAKI
8          ABELA
A"
-A-
*
2OOC
In the
Adventist Mission
Feb 1,1965
Jul 1, 1971
--- -q
s'°
9
(1965-1973)
3
(1971-1973)
91                            —
(o) WOLLAMO SODO *
(b) WOLLAMO SODO *
3 rd
3 rd
Apr 1,1954
14
(1954-1972)
Dec 6,1969
3
(1970—1972)
CAA
N W RC.
2060
2050
Al the
NCD
At the
S.Im
—
J
At
Police
15 K ns from Bodi’'
30 km horn Aiobo Cold® 390 Km. trom Abflb°l
390^ Add,,AbOb°
d
II
12
13
YIRBA                                      ■*
4th
Jon 29,1973
(1973)
NWRC
I
--- ----------------- t
J
WEST AWASSA                      *
Evop. Pon  8
Raingauge
Moy 30,1973
Feb 17, 1972
1
(1973)
1
(1972)
the
Stotion
the
Stotion
N W.R C.
N W R.C.
18 Krns A’0,,°
AJE
*                         4th
2
(1972-1973)
6
(1966-1971)
2
(1972-1973)
At the
Po,«ce Slotion
WULBAREGH                          *
4th
Feb 3,1972
2h
38-12* e
07-03* r
38^2 .
9E
Onthiwoy to A.obo Cohio
’on w0) *°
E ,„jlr.
57 K mt W*
— -
14
(a) AWASSA                             *
3 rd                                  Jan.1,1966
N.W.R C.
A.A.R.
(b) AWASSA                            *
gnd
Jon 1,1972
AAR
07*03*
N
At the
AAR
Al the
Aar
LE5EHP
N.W.R.C.= Notlonol *°tlr
Sto lions outside Bilote Bo sin
C.A A.= Civil Aviation Administration
N C D. = Notional Community Development
AAR = Awosso Aflr'c«h
Ur(J|
SIM
Sudon interior M
’ Corn*isnon
* Morch
••■onRift Volley Lakes Basin Station HOSSAINA (S.I. M.)
RAINFALL DATA (mm)
Lot. N.
-
Elevation ..2 29 0
L onq. E . . 37°            50'
(m)
Provinc o_s HO A
Year
Jan.
Feb
Mar.
Apr.
Moy
June
July
Aug
Sept
Ocl
Nov
Dec.
Total
Remarks
1953
1954
—
—
34 9
297 0
962
182.2
2.8
17. I
105.4
—
56.2
1955
127.3
1.1
83.9
76.0
121.7
1956
30 1
16.0
36.3
225.5
107. 1
2 01.3
140 .5
142.6
1957
25.3
183.6
135.5
1958
15. 5
67 .4
50.2
36.3
210 8
—
1298 .5
1472.9
1237 , 3
—
1959
56. 0
104 6
118.5
106.7
76.9
I960
16.3
40.4
280.5
75 6
19 A1
0 .C
80.0
I9SP
0.0
.40.4
7.5
129.5
250.2
94 8
249.7
214. 8
72 .9
1963
—
25 2
40.6
199.0
82.6
1 964
1965
10.8
29.0
34.3
35
142 2
183 2
16-4
84 9
114   8 31 7
1349 4
1098 2
1292.9
1966
1.0
—
72.1
274.0
58 5
125. 6
—
110. 9
119 1 113 0 HO 8
122 1
169 3
lie 8
53 3
1967
0.0
18 0
115.0
123 5
158. 5
1 96 8
1.5
68 0
34.5
89 0
—
HO 0
75 3
115.1
117 7
188.8
134    9
208.5 156. 9 174.7
112   5
—
187 0
189 4
i62    6
—
251 5 155 0
79 0
181.1 168 9 239.7
258.2
205.2
185 4
126 .6
102 . G 2 80 1 210.5
117 2
172 2
170 2
184 3
132 1
—
115 4 189. 2
228 7
255 2
74.3
128 7
—
222.8
60 0
148 9
115 9
169 0 130 7
74 5
176 0
—
2.1
33 5
57.8
232.0
4 6.0
67. 8
104 7
43
107 7
36 7
4A
R4 9
47.3
59 0
Al 5
22 .0
22. 1
10 5
2.6
57
69
—
26 2
60
53 4
64 6
17 1
00
—
0o
69.5
—
42 2
03
30. 4
29 3
0.1
29 4
58
39. 6
17
35 0
75 5
496
—
00
—
—
—
------ - —
... —4
CLIMATIC data
Stotlon      of HOSSAlfcm _( S . I . M ) - Danin RIFT VALLEY
LAKES Elevation
Lot. N. Long. E.
07* m32‘_______ 37^ 50^________ 2 2.9 ft______ imj
Detail
I nlmum Temperature Unit
•c ...................... ...
Year        Jon          Feb
Mar          Apr.
' May
June
Sept
Oct
Nov
0«c
Tofal
Remarks
1 1953          —           — 11954            -            6.0
H955          8.4          5 . 5
1956           6,6         6 . 7
1957          —     1 7.6 p9 5 0    18.3        1 10 1
1 1959          —           — 1 I960          —           8 8
1 1961          7. 9         9.7 1962          6 . 9        6 7
1963 ' — 9.3 1964 ' 7.7 9 . 1
,19 6 5        7 . 4         6 . 6 1966        7, 1           —
1 1967         5 . 1          9.3 I960        4 . 6           9.4
—           8.8
6.1
1* ill
4*''•
---
9.1          —
8.5
8.7          9.5
•
8 . 5       10. 5
?■*
i-f- -
10. 6   rio. 7 9.6         —
10. 1 10.0
——
12.f 12 2
II .7 •11.7
II. 1 11.9
9.9 II . 5
9 .0
j_. |
10.7
10 .31     11.2
10.6 |       11.7 8.7             -
8 .4
7.9
9.4
—
10. 3
11.8
10.8
II . 3
—
9.5
8. 1
9.3
10.8
—
7. 6
9.3
83
8.1
98
—
99
10 1
10 8
II 1
-1
10 . 1
9.7
9.4
9.9
—
July
7.6
10.0
9.1
7.2
10 .4
—
—
108
—
II 2
10 4
—
II . 1
10.8 96
Aug
7.1
9.8
8.9
74
10.3
—
—
II 5
114
10 9
10 3
9.3
10 6
10. 0
-
51
93
92
6.7
10 7
II 0
—
10 8
—
110 10o
9.8
88
10 4
9.8
—
3.8
7.1
6.6
6.5
6.1
79
95
94
93
78
93
8.9
8.4
8.4
—
7.7
6.2
3.2
79
—
85
A2
II 0
99
96
7A
91
7.6
87
—
—
5.1
6.8
—
5.6
—
6.7
89
86
76
9.0
76
—
50
—
—
l
1  .-
1Cl IMA7IC DAI/
Stot'on cii            HOSSANA         (S.I.M )
Rncin R,FT VALLEY LAKES
Dfltail Av*. Daily Temperature Un|, °C
lot N Llnvollon ___L__o_ng__._E
.J.____
07° 32 37* 50
2290
Year
Jan
Fob
Mar
Apr
May.
Jun* |         July
—
—
Sori
—
16. 6
Or 1
1953
1954
1955
—
18.6
16.6
ie. 6
19.2
—
10.0
—
:5.6
16.7
—
16.0
1956
19 .6
18.3
—
17. 0
10.2
16.8
1957
-
17.4
16.8
—
18.0
20.0
1950
16. 9
19.5
21.4
10.8
—
1959
-
>19.0
19 .3
—
19 .0
I960
20 0
—
18.5
19 3
—
X—
1961
16. 2
■ ■» a
15.4
15.3
19.4
17.8
13. 0
1 5 .6
—
1962
15 . 4
17.0
17. 8
15. 7
10.2
16.5
15.0
16 .8
—
16. 2
1 6 .9
16.0
18.9
—
18 5
15.4
13.8
15 . 8
1963
10.4
16.4
A *j a
—
1 5. 8
15.5
15.1
18.1
—
—
15.4
—
14 . 9
—
16.4
15.6
19.8
18.8
—
15.5
—
1 5.4
154
15.4
16.0
196 4
15.6
16.4
16. 8
16 .0
—
15.0
1965
17. 3
17. 2
; 17.2
17.0
*« r
14.8
—
15. 2 14 . 8
16.1
*• —
17. 0
15. 5
15.7
1966
,19 6 7
I960
17.2
18.0
17.4
- 17.5
.16.9
16.4
14 . 2
—
15.3
14.9
14.3
—
15.8
15.0
14.8
—
15.6
14 . 0
16.8
—
—
15.4
15.4
—
15.4
10.1
—
—
14 .7
—
15 .3
—
14 .3
—
| 15.7
14.8
|
—
15.3
15.9
16.5
15. 1
—
15.6
15.1
—
15.2
15 .2
14,3
—
14.8
—
—
•— - *
1
____ He,: ,* 1 «
__
rG
Station at
HOSSAINA (SIM.)
C_L IM AT IC DATA
Basin G HIBIE — OMO
Elevation
Lot N 07® 32* Lona.E.                ° 50
2290 (m)
Detail .Ave Maximum Temperature Unit
°C
Year
Jan
Feb
Mar
Apr
May
Juno
July
Aug
Sept
Oct
Nov
Doc
Total
Remarks
1 954
1955
1956
1957
1950
1959
I960
1961
1962
1963
1964
1965
1966
1967
I960
1969
—
26 5
27. 0
—
30.5
29.3
27 6
29.3
32. 5
29.9
20.1
29.7
30.7
—
20.1
26.1
27. 1
27 9
25 0
23.0
25 5
24.0
2 0.4
33.2
20.2
26.5
20.5
20.3
20.6
27.0
—
27. 9
29 2
—
27. 6
20.0
—
27. 1
21 3
24.3
23.5
25 8
22 7
2 5.5
216
22 2
22 0
25 9
24 3
22 5
27. 5
25.0
21 4
20. 0
10.6
19 2
i
24 5
—
—
16.7
24.0
—
23 4
22 1
.25.4
23 5
24.5
25.4
23.9
25.6
19.2
2 4.6
2 1.0
19. 1
22 .2
20.6
24 9
24 2
24 1
30 7
27 A
23.5
21 7
—
216
24 3
26 3
27 2
2 5 .3
32 0
—
26 4
23 0
—
219
23 4
27 5
—
—
32 4
27 1
27 7
22.6
—
22.0
21. 5
24.7
23.0
22 4
20 5
20 0
19 9
25.5
23.3
23.3
—
—
19. 4
18.9
10 2
—
23 0
23.7
24 4
28 9
26.7
—
20 2
—
19.9
20.9
10 9
—
20.3
—
22 4
—
21.0
—
—
25 2
24 9
—
—
26.3
21.6
—
24.2
23.5
24.5
21.3
25.3
23.3
24.8
—
22.0
—
—
—
—
20.9
—
—
20.3
10.7
—
—
—
10.9
19 4
10 1
—
20.0
19.0
—
—
21.3
20.2
—
—
22 2
21.3
22 2
—
23.6
21.5
—
—
24 7
—
—
—
<
•7
Riff Volley Lakes Bosln GHIBIE-OMO Sfaflon_H.O_SSAINA_LNL.W.R .c)
Lof. N 07*32*
RAIN FA LL DATA (mm)
Elnvafion_______________________ (m)
Long. E. _37J5I.'_
Provinc e_S.10 A MO. ?
Year
Jan
Feb.
Mar.
Apr.
May
June
July
Auq.
Sept
Oct
Nov
Doc.
Total
Remarks
1972
—
81.1*
65.9
164.9
71.4
136.1
196.3
101. 2
152.3
5.6
0.0
18.1
1973
25.5
4.6
0.0
40.7
155.3
' 1 42.5
152.1
241.5
215.4
64.3
0.0
19.7
1061.6'
1974
16.1
24.2
137.1
2 2.4
13 9.0
60.6
•
.•
•
Record of 25 dav«R
/
ILL I MAT I C_ DATA
Station at J.QSSAJMA—(N.W.RLC^l___________ Basin .GHIBIE-OMO__________
Detail Ave. Minimum Temperature Unit °C
Lat. N. O7?32’,„. Long. E* 37
Elevation(m)
Year
Jan
Feb.
Mar
Apr.
May
June
July
Nov
Dec
Total
Remark*;
1972
1973
1974
• —
—
6.3
76
ft
8.0
10.0
03
10.5
—
11.7
9.0
*
10.5
12.1
9.9
10.6
10.7
9.0
-
9.0
10.2
0.4
10.0
10.2
Aug
10.1
10 2
Sep|
9.9
9.7
Get
10 0
09
9.4
00
9.0
5.7
. ...
—
—--------
—
—
.. - .
—
-
-----._
*
—— • - — • —
- — -
]
-M- Record ot 25 days *
•-_ ________________  L
- . . . .--------------------------------------------------------------------------------------------------------------------- --------------------------- ------------------------------------------ -^4.— ................................. - —
CLIMATIC DATA
Lot. -N. .07^32j9
)
Long.E. .37JJH.'------------------
Station at _HO.&SflNA_(N.W.fLCJBasin
_GHlBIE_r0M0 Elevation(mJ
Detai
l .Daily TemperatureUnit _?C
Year
Jan
Feb
Mar
Apr.
May.
June
July
Auq
Sept
Oct
Nov
Dec
Total
Remarks
1972
—
13.6*
F 17.1
16.2
17.0
15.6
15.4
15.1
15.6
16.9
16.8
16.9
•
1973
16.8
18.4
20.0
19.6
16.8
15.0
15.0
14.6
15.3
15 4
15.8
14.4
1974
16.0
16 6
16.0
17. 1
15.8
14.8
•
•
-
•
■<
•
•
••
*25 days 7
C-CLIMATIC  DATA
Station at HOSSAINA_(N.W,R,C.) Basin .GHIBIE-OMO
Detail .Ave, Maximum TemperatureUnit °C
Lat. N-. .07° 32'
Long.E. 37»5l'
Elevation .
,|m).■ ■■■
10   T
RAINFALL DATA (mm)
I
Rift Volley Lokos Bosln
Station_A       LABA       _C01_JLE0
Lot. N.
.
«
f
EI eva 1 ion J 8 5,0 . (mJ__________
Long. E. -38*06'
(m)
.
Province S_H 0 A_________—_
II ** 0
♦ Year
Jan.
Feb.
Mat
Apr.
May
June
July
Aug.
Sept
Oct.
Nov.
Doc.
Total
;J
Remarks
1966
15.0
140.0
88.0
235.0
38.0
93.5
118.0
16 3.0
86.0
26.0
10.0
0.0
1012.5
1967
0.0
33.0
56.0
61.0
187.0
—
—
—
—
—
9 0.0
0.0
»,
1968
6.0
158.0
36.0
17 6.0
54.5
68.5
135.0
135.5
99.5
38.0
35.0
6.0
948.0
1969
■.
54.0
174.0
105.0
115.0
78.0
148.0
34.0
—
—
—
0.0
f
i
1970
119.0
71.0
184.0
90.0
36.0
185.0
170.0
138.0
6 6.0
0.0
—
• f
. L* / 1
1971
6.0
1.0
26.5
79.0
^04.0
94.0
122.0
78.0
105.0
123.0
90.0
90.0
—
. T ’
197 2
3.0
137.0
92.0
173.0
53.0,
65.0
159.0
114.0
19.0
0.0
25.0
918.0
1
1973
56.0
—
0.0
29.0
187.9
III.O
263.6
210.1
59.4
71.1
0.0
40.8
•    / i
".J
1974
0.0
13.1
127.2
1 5.0
81.2
!'• »
r<
t
-J
i
•*
r
• i*
1
■ c~
x .  .’j ■’ *
; *.»
i • *•••”
• 1 • 4
j’v* •
.i
i.
. ■. 1
J h’f
• - r
•
7r*
* i »’t* '
1
v
.i <.
•
’■■
___ _
II nil mi Illi*
tun
CLIMATIC DATA
Lol N. .07*2.2'
30
Long.E. _ iQ6-----------------------
Station at ALABA COLITO Basin .RIFT VALLEY.
Elevation L&.5O Im)
Dotoil .EVAPORATION .
Unit C.M.
Year
Jan
Feb
Mar
Apr
Moy
June
July
Aug
Sept
Oct
Nov
One
Total
Remarks
1973
1974
—
22.0
—
21 T
24.8
20.7
25.4
21.3
20.5
15.1
16.3
— • -
19.5
—
15.8
13.9
16.9
10.7
20.4
— —
—
—
•M Sum of 25 dnvsCJJMATICJATA
Lat. M.
Long.E.
Statioh of ALABA—COLITO Basin RIFT VALLEY
Detail _Ave. Minimum TemperatureUnit
Elevation
07’ 2 2* 36" 06' 1950
Year
Jan
Feb
Mar
Apr
May.
June
July
Aug
Sept
Ocl
Nov
Dec
Total
1966
—
13 6
—
13 1
Ill
—
—
12.7
12.5
10.4
88
00
1967
—
III
12.6
13 1
13.4
—
—
—
—
—
11.2
68
1968
7.4
12.6
10.6
13.3
6.2
12.2
12.8
12.4
12.1
10.9
94
90
1969
12 9
12.5
—
12 5
128
12.5
12 9
13.2
—
—
—
7.9
1970
12.1
12.2
13.1
—
12.2
13.1
13.2
13.2
13.4
II 5
60
—
1971
10 4
85
12.9
12.2
13.2
12.6
12.4
12.6
13 8
II 3
10 5
—
1972
II 6
13 6
—
13 2
12.0
112
12 7
11.3
108
83
8.3
9.0
1973
10.2
—
12.3
13.0
13.8
13.4
13.2
15.8
13 0
II.1
8.4
7.6
1974
100
II 3
12.9
9.4
12.7
•
•Iz
Station at ALABA_COLITO
CLIMATIC DATA
Basin rift valley
Detail .Ave. Daily Temperature Unit
Lot N. 07’22’
Long.E. .SB" 06 Elevation IB50 (m)
°C.      ____
Year
Jan
Feb
Mar
Apr
May
June
July
Aug
Scpl
Ocl
Nov
Dec
Total
Remarks
1966
—
1967
I960
1969
1970
—
17.8
20.0
19 2
204
20 5
19 3
196
20 2
—
21.2
190
—
1971
1972
18.6
19.8
18 8
19.8
1973
1974
19.7
19 0
—
20 2
19 8
207
—
22.2
19.9
20 0
202
19 5
200
—
19 8
20 0
22 2
19 3
19 6
19 5
16.5
19.7
19 8
19.2
204
20.4
19 6
—
—
—
18 8
18 9
19 3
18 2
19.2
19 2
—
180
180
18 2
17 7
18 0
18 1
18 0
—
18 2
18.7
17 8
18 0
18 2
19.3
18 6
—
18 6
—
18.8
19.3
18.7
19.0
18 4
—
18 8
—
re.8
18.5
17.2
184
18 0
18 3
18 1
—
16 4
18.2
18 6
18.0
17 9
16.6
18.5
16.1
—
—
19.1
17.3
I
I
’ "T
I
t
I
I
•
7
I*
CLIMATIC DATA
|_0, f.|
O7_"q2'
Station at _AL AB A_ COLl to  Basin Rift valley
• 
Elevation
Lona E 38° 0
6
1850(m)
Detail _Ave Maximum Tcmperolurc Unit
°C
Year
Jon
Feb
Mar
Apr
May
June
July
Auq
Sool
Oct
Nov
Dec
Tolal
Remarks
1966
—
—
1967
—
272
29 9
29 8
1968
28 2
26 0
275
1969
271
—
26 8
274
257
275
1970
26 4
1971
26 4
26 9
26 6
28 2
29 0
28 5
—
273
24 9
—
25 3
25 3
255
23 9
1972
279
26 1
276
26.9
28 1
25 6
26.8
26 6
274
25 1
28.7
1973
29.2
—
32 0
1974
28 1
29 1
26.9
31.3
29.2
26 9
26 6
270
25 1
23 6
—
23.2
23 0
23.2
23.0
252
23.0
23 4
—
24 0
242
22.5
23 5
25.1
22 8
24 8
—
25.1
—
24 1
24 8
266
25.0
26 3
—
26 7
—
260
257
28.1
25.6
27 2
25 4
26.8
—
26 7
259
290
276
278
26 4
28 0
28 3
—
—
29 2
27 0
______
_____t
1            - ' --------------- ’ -■
14
Riff Valley Lakes Bosin StationBILATE AGR<_ESTATE
RAINFAI L DATA (mm)
Elevation l340(m)_
(m)
Lot. N. _06*_4J------------------------- Lonq E. . 38*01’ Province SIDAMO
Year
Jan
Feb
Mar
Apr
May
—
June
July
Aug
Sepl
Oct
—
Nov
Dec.
I olal
Remarks
1971
1972
1973
—
4.3
27.5
—
94.6
0.0
72.9
11.8
1.6
—
154.8 43.7
—
07.5
44.2
03.4
78.9
49.3 101.0
—
—
_-
F
—
—
9 8.4 215.1
—
36.2
71.3
90.7
73.7
19.1
—
20.4
0.0
13.3
24.9
10.6
—
739.5
613.0
F
—
—
—
—
—
. - ---------
—
—
—
—
—
—
... .
—
—
—
—
—
—
----
-—
-
- -■ -
—
- --------------
Source from mnnlhlv Weather Renert of the C.A.AC LIM ATIC_ _ D ATA
Station at _BJLATEAG^ESTAJE Basin .RIFT VALLEY_
Detoll _Ave, .Minimum Temporalurc. . Unit
Lat. N. _06r4f____________
Long.E. _3BL0i'__________
Elevation 1340
Year
Jon
Feb
Mar
Apr
May
June
July
Auq
Sept
Oct
Nov
Dec.
Total,
Remarks
1971
—
—
—
—
—
—
—
—
14 5
—
—
14 1
| 1972
15.1 I
16.1
14.5
16.1
153
155
16 3
15 5
15 6
14.8
14 3
15 3
•
| 1973
15.5
164
15 5
16.1
17.1
167
157
16.2
16.1
14 8
13 9
13.7
< ji    *
f* ' -
• t. .
•
' 4 tl'r/
•
\ J t
1
•CLIMATIC DATA
Lot. N. _06JUU.*-------------- - Long. E.     _3SLQ—-—
Station atbilate ag. estate Basin _RI.ft_valley Elevation I.3.4.Q—LmJ_
Detail Ave. Doily Temperature Unit°C
Jan.
Feb.
Mar.        Apr.
May.
June
July
Auq
Sept
Oct
Nov
Dec.
Total
Remarks
197I
—
—
—
—
—
—
—
—
—
—
—
I972
23.4
23 2
23.2
22 6
22.4
2I.6
2I 4
21.4
2I 8
—
22 5
23 4
YI9e7o3r
240
25 0
25 4
24 e
23 4
22 4
20.8
20 8
220
22 4
2I 6
22 2
22 I
f
1,
•
I* •
<
•*
' d. !----------
•
"I
■
• ’i
A
.»
ICLIMATIC DATA
Station at BLLATE—AG^E.STATe;__________ Basin _R|FT_yALLEY_____________
Detail _Av.e^Maxjmum_Iempctalure Unit
Lot. N. Long.E.
Elevation 
"C
OR* 4.1. ______ 38*Ol'._.______ I340-. J«L
Year
Jan.
Feb
Mar.,
Apr.
May.
June
July
Aug
Sept
Oct
Nov.
Dec
Total
Remarks
1971
—
—
—
— ’
—
—
—
—
27.9
—
—
29 8
II |” *
1972
31.6
30.4
31.9
29.0
29 4
278
264
274
29.5
29.9
30.7
31.5
1973
32.4
336
35.2
33 4
29.7
28 2
25 9
25.5
279
28 5
30 5
30 5
*•
1974
1
.1 ■
i
•% /
• 1
1
4 ••
1
*
•LL_<nHoy_ l o k es_0 g in
s
StationJtkATEN TENA
Lot. N. _0S±58'
Year
Jon
Feb
Mor
Apr
Auq
197 3
—
3.2
0.0
RAJNFALL DATA
E If* vo lion Lonq. E. .30-09’
July
293.6
Sept
Oct
Nov
Dec
Total
Rlmorh
59.7
62.0
—
114.7 - — __
72.5
—
13.4
--—
— - -
—
—
- »-
—
—
-•_
—
---------
—
— -
—
1
•-- — —
—
----- ---
-
—
•
•_
—
—
—
--—
1
---------
—
—Kill Vallr*y Lakes Basin Station A BONSA . .
Lot. N 07" oe' __
liAINf ALL DATA (mm )
Elevation 2000
lonq.E. 37" 59'
(m)
Province SHOA
Year        Jan
Feb
Mar
Apr
May
June
Oct
Dec.
Total
Remarks
1965
1966
1967
I960
1969
1970
1971
1972
1973
—
5.0
26
28
37 3 122 3
32 2
—
31 1
00
154 3
36 2
69 7
145 3
00 0
57
89 1
66
72.9
68 5
93 3
100.3
1 1 7.9
236 3 66.7
42.4
-
204 9
179 2
106.5
14 2 8
45 0 100 9 215.3 41.4
56 7
61 9 168 0
64 2
964
62 5 162 2
—
151.9
79 2
09 0
86 5 138 0
76 5
65
110.7 43 .3 107.2
July 112 6 2462 135 8 100 5
150 4 104 .4
III.3
01 4 230 0
Aiiq,
106 4 194 6
222 5
215. 8
102 9
174 0
144.2
143.6
Sept 115 1 169 6 197 4
139 8 110 4
77 6 141 0
90 1
85 0
140.9 33 3
56 6
32 4
09
66 2
04 2
47 5
70 8
Nov
29 4
7?
204 1 38 4
01
0.0
72 3
—
16 5
0.0
04
II 0
0.0
—
8.5
-
22 0
—
1234 . 5 1382 . 6
1099 4
9 8 0.9
—
1047.9
—
-•-
. . ..
-
•-
•
•
-
—
---
Source Civil Aviation Administration
O
O—-------------------- ~~---------------------- RAINFALL, DATA (mm)
ElevationL5.O_Q----------------------- (rn)
Long. E. _30±O 0’Provinc e_SJD A.MO
------- .2 i
Pi ft Vol ley Lokes Bos In
S1aflon_S AK.LE____________
Lot. N. _CL6_L5_3^______
Year
Jan
Feb
Mar.
Apr.
May
Juno
July
Aua.
Sept
Oct
Nov
Dec
Total
Remarks
1965
—
0.0
56.9
151.1
94.0
66.0
06.2
45.2
40.2
167 4
03 8
2.1
—
1966
15.7
58.6
64.6
181.5
36.7
64 0
299,6
2 13.2
7 5.6
60.1
113
14
1093.5
1967
6.6
17.9
75.8
191,6
250.2
142 .6
187.5
1404
69.0
58.3
124.7
2.7
1269.5
I960
8.2
107.7
52.3
209.0
73.5
67.7
—
1 1 1. 1
34.3
65 3
2 7.2
6.2
—
1969
59.9
i n. i
III .4
96.6
127.6
51.1
100.5
11.5
1 51.5
16.5
54.5
15.0
907. 2
1970
63.5
31.0
221.0
105.0
—
144.0
—
162.0
166.0
107.5
—
—
—
1971
13.0
—
50.5
155.0
175.5
165.5
164.4
141.0
110.0
—
43 4
54.6
—
J972
60.5
37.5
29.3
136.0
136,9
133.3
09.0
—
—
—
10 .0
40.2
—
1973
—
—
—
—
174,7
—
254 7
165.7
—
—
—
—
—
—
—
--
—
—
•
... . .
Source* Civil Aviation AdministrationRiff      Volley      Lokes      Bosln Staflon_J\BELA_A_yVA_DUl
Lot.N.         06-42'
RAINFALL DATA (mm)
EI o v a 1 i o n_14 0^)_________
Long. E. _____312.5.62________
(m)
Prnvincft SIDAMO ______ ________
Year
Jan.
Feb
Mar.
Apr.
May
June
July
Auq.
Sept
Oct
Nov
Dec.
Total
Remarks
1971
—
•—
— ;
—
—
—
1 24.0
91 .5
79.6
103.2
9.3
18.1
—
1972
11.8
- 48.9
15.4
154.4
126.8
119.9
131.6
83.1
37.6
51.2
97. 2
19.3
897.4
1
-
•
PREC
PITATI
ON (C. /
r-oe-
1973
11.5.
0.0
0.0
6.6
14 4.9
73 7
171.9
95.0
32.8
114.0
4.4
0.0
656.6
AVE^
M AXIfc
UM T(
MPER/
TURE
•c
1973
31.1
32.7
3 3.7
—
26.7
26.6
24.6
24.1
27.2
27.9
29.8
2.9 9
AVE.
MINIMI
M TEN*
P.
1 973
14.1
16.4
16.6
—
16.7
16 5
15.2
15.0
14 9
14 4
13.0
12. 1
DAILY
TEMP.
1973
22.6
24.6
25.2
—
22.7
21.6
20 0
19.6
21.0
22.2
2 1.4
21.0
i
Sourrr^WADU ----------- —  , ^n-1---------- ---------- ’     ~
23
Piff Valley Lake\Bosir
'r
• -IN'F ALL DATA (mm'
5
^lotion WOLLAMO-SO
ODO (SIM)
L Ipvo f ion 2060_________
(m)
Lot. N. 06° 52'
„
I ong E. 37" 44*
Provinc e. SIDAMO
Source Civil Aviofion A dministr ation*
_C LIMATIC_DATA
Lol M.
Long.E.
Elevation .  2060
05*52'
37° 44*
Station at  WOLL AMO-SODDO (S. I M.) Basin . GHIBIE-OMO
Detail Ave- Daily Minimum Temp.
Year
Jan
Feb
Mar
Apr
May
June
July
Auq
Sept
oct
Nov
Dec
Tolol                Remarks
1954
1956
1957
1958
-
—
—
13 1
13.3
11.8
12.9
—
12.7
13.1
13 3
—
12.8
13.1
13.7
1959
I960
1961
1965
1966
-
13.2
12.5
14.1
—
—
—
—
13.2
14.2
14.3
—
—
—
—
13.3
14.8
14.5
—
—
11.9
12.8
14.4
—
12.8
13 9
13.3
14.2
—
12.0
13.7
13.6
13.5
14.0
11.3
13.7
10.3
13.2
—
12.2
13.0
13.1
—
—
--
10.6
12.7
—
11.9
12.6
12.2
—
12.A
12.6
II 0
12.4
—
11.6
12.4
—
—
II 9
—
13.3
12.9
12.9
__
1
1
10.0
I
—
12.2
•
1
-1
■-
13 0
_
1I
_
—
—
i
i
i
i
♦
iCLIMATIC data
n * t|
OF," 52'
Station at WOLLAMO— SODDOfS.I M) Basin GHIDIE-CMO
% Detail Ave Daily Temperature
I onq.t .                   37° 44' 2060
Unit
E      levotinn C
Yoor
Jon
F ob
Mar
Apr
May
June
July
Aug
Sept
1). 1
1B
I Ollll
U.tl
1954
1956
1957
1958
1959
I960
1961
1965
1966
.-------
—
—
—
—
24 9
22 2
23 4
—
—
—
—
—
25.2
22 6
24 0
—
—
—
—
—
24 4
24 2
23 3
—
—
19.2
IB 8
23 0
r
23 0
22 6
•
21 8
—
—
23 3
—
20 7
22 6
20 8
21 8
—
18 8
17 0
18 9
—
21 0
19 4
19 9
—
—
-
16.0
17.2
—
IB 6
17 3
17 8
—
17 2
16 6
15 6
I7G
—
18 6
16.3
—
—
16 6
198
22 6
21 4
20 6
—
1
19 3
—
—
—
22 8 22 7 218
—
26 2
23 2
23 5
—
24 2
23 6
23 5
r_
190
174
— -
20 6
— .
15 2
_
1
a
<*
X
"A
•
1
7
______
1
—
I
I
I
-•
-
-
_1station at WOLLAMO-SODOO ( S, I M )
CLIMATIC DAfA Basin GHIRIC —OMO
Detail Ave Daily Maximum             Temp             Unit
Lui N OG" *52
7  44
Long.E. 3 "
Elevotion ____________  2060             (m)
•C
Year
Jan.
Feb
Mar
Apr
May
1h1
Dee
Total
RcmnrH.
1954
1956
—
—
—
•-
1957
1959
—
37 2
31.1
33 6
31 7
—
331
31 4
32.1
I960
1961
—
36 6
31 9
32 6
34 2
—
—
356
336
1959
354
—
32.2
—
30.4
—
—
1962
1963
—
300
—
—
30 0
—
—
—
27.1
Nnv
—
39 6
334
33.7
34 1
—
—
289
276
—
357
34 0
333
34 1
—
—
30 3
25.9
1965
—
265
239
32 4
—
294
316
290
300
—
—
24 9
24.0
June
24 6
—
29 7
259
26 7
—
—
—
25 5
—
—
—
1966
—
—
24.7
236
23.7
21.3
July
21 6
—
25 2
22 0
23.5
—
21.7
22.3
243
206
20 1
Aiij
2? H
—
257
24 2
—
—
214
229
24 0
—
20 5
Snpl
2G 5
31 9
31 0
28 2
—
—
26 4
24 2
259
—
—
—
32 2
32 5
307
—
—
282
293
281
—
—
—
—
•
•piff Volley Lakes Basin GHIBIE - omo
Station ^WOLLAMO^SQDDO (N W.R.CJM
Lot. N O6”52'
RAINFALL DATA (mm)
F1pvn♦inn2050
Lonq. E. ,3?“44'
(m)
Pr ovine e S I D A MO
Year       Jan.
Feb.
Mar.
Apr.
May
June
July
Aug.
Sept.
Ocl
Nov
Dec.
Total
Remarks
1969         —
—
1970      1 13.5
301.6
1623.0'
1971       39.5
—
31.2
11.4
101.8
—
101.0
197.4
—
137.8 169.3
—
195.1
301.3
—
2 62.5 130.6
—•
221. 1
245.5
1972         6.5
59.8
71.4 |
—
161.4
109.9
24 6.9
112.3 |    113.9
—
0.0
32.3
47.9
0.0
5.0
90.0
1548.7'
31.1
21.2
4 1.9
—
92.6 119.5
195. 1
1973
1974
•
•L.
_____
7
1
<
* Oulalde Bllota BatinC LIMATIC_DAT_A
Station at _wollamo-soddo*(N w r c ) Basin _ GHiBiE^OMO______________________
2
Elevation 
Cat. N
Long.E.
OB’ 5?.
3T " n 4‘ 2050 _lrn)
Detail _Ave Minimum Temperature Unit-
Year
Jon.
Feb
Mor
Apr.
May
June
July
Aug
Sept
Ocf
Nov
Dec
Totol
Remarks
1969
—
—
—
—
—
—
—
—
—
—
12.1
1970
II 5
13 0
12.3
12 0
II1
10 4
97
94
96
R9
92
8.3
1971
9.8
12 4
14.1
12.2
13.0
10 9
7.7
7.5
7.8
78
7.7
1972
82
83
8.7
8.3
85
9.6
7.5
8.2
86
9.1
84
1
J
I
•
r
______
1
* Oulsid e B ilole Bosir.
i-CLIMATIC______ data
Station at WOLUAMO-SODDO*(N.W.R.CJ Basin ,_GHI0IE OMO-------------------------------------
T
Lal. N. Long.E.
Elevation
OGn 52
37° A A*
2050 Jm)
Detail , Ave. Doily TemperatureUnit ----------------------------------
--------------------------------------------------- —
Year
f Jon
Feb
Mar
Apr
Moy
June
July
Aug
S*!pt
Oct
Nov
Dec
Total
Remarks
1969
—
—
—
—
—
—
—
—
—
—
—
13.7
1970
178
19.4
18.0
18.0
17.2
15.8
15 0
14 4
15 6
15 6
17 0
16 8
1971
17.4
19 0
198
179
176
154
136
13.8
14 1
14.3
14 8
14.3
1972
15.7
16 2
16 8
16.4
16.2
146
134
13.9
14.3
14 8
14 4
11
— —--
-   —          - “ r _
------------- — .
--
M Outslde Bilate Basin
L
—------------------------------------------- ----------—__________ Z______ZZJEZ-------- —
C L.IMATIC DATA
Station at _WOLLAMO- SODDO (N.W.R.C.)* Basin GHIBIE-OMO
Lot N. _og»52.’._____________________ _
Elevation“2050
Long.E.
—------/•'/// Vo Hoy l Station YtRBA *
I.Uf N 06*56'
Ro'iln
h a i rj f a t i
I Invn f ion I nn j I 3
(
DATA j(jn rn )
(m )
l^rovince SID AMO
I
*- Outtlde Bllote BotinCLIMATIC DATA
Lot.N. ------------- QTMQ'.----------
—
------------------ Long.E. —3-8126------------------------------------------------------------------------------------ Station atWEST. AWASSA2L Basin RIFT VALLEY .LAKES Elevation ------------------------------------------------------------------- ------------------------------------
Detail EvaporationUnit Cm.---------------------------------------------------------------------—------ -------- --------------------------------
Year   / Jan.
Feb
Mar
Apr.
May
June
July
Auq
Sept
Ocl         Nov          Dec           Total              Remarks
1973   / —
•
—
—
—
—
17.2
18.2
170
13.4
13.1
II.0          12.6
I
*. ’ Il                                     1
1!
••
V
j
r i              1 11
1 ll          1
1 11
. :i ■*.     |
I I!
’
-
J t ■'     1
r ’1H
1n
11
X Outside Bllote Batin
1 M ] 1
iXV 11 !«y„-Lakes Bosin >n W(JLBAREGH__*
’ J 07°42'_______________
Fob
Mar.
Apr.
Moy
Juno
RAINFALL DATA (mm)
Elevotion
Long. E. 38*12'
Aug         Sept          Oc I 174.5       7 5.3       0.0 214.0      221.2       62.1
(m)
July
115.6
1.0
77.7
0.0
165.4
22.5
37.0
166.7
154.6
128.5
212.6
186.5
’ -----
-
_ ____
—- . ■
•
-
— -
_______l Rift Volley Lakes goaln
1 Station AWASSA
■l.flf.N 07*03'
RAINFALL DATA (mm)
ElevationIZJLO---------------------- (m)
Long, E. —30*29’Provinc e_.S 10 AMO
Year
Jan.
Feb.
Mar.
Apr.
Moy
June
July
Aug.
Sept.
Oct
Nov
Dec.
Total
Remarks
1966
10 5
92 5
36.0
169 5
1450
64 0
117.5
148.5
1600
60.5
23 0
0.0
1027 0
1967
0.0
0.0
— •
—
131.0
132.0
216.5
139.0
92.0
—
—
0.0
—
1968
0.0
—
— ..
157.0
53.5
—
—
96.0
115.0
33.0
—
II.0
—
1969
35.4 ,
110.8
138.8
89.4
80.9
68.2
232.
34.9
139.7
48.5
24.3
0.5
1003.5
1970
44.3
61.8
139.?
65.9
57.4
61.1
140.3
172.2
108.8
109.6
0.0
4.7
965.8
1971
11.8
2.6
47.9
—
181.7
17 3.8
100.7
114.4
67.0
64.2
130.5
10 9
—
1972
15.7
95.3
53.7
132 4
124.2
99,4
—
158.9
118.2
15.9
7.6
| 36.4
—
1973
15.0
13.0
0.0
76.7
128.0
89.6
136.6
2 07.7
89.0
41.0
0.4
4.4
801.4
1974
7.3'
18.1
95.0
17.0
127.6
93.9
“1
*
• '•
1
•• ’*
•
9
1
1
•
# Outside Delate Basin -K 24 Days Record3
Station (P            AWASSAX
CLIMATIC LATA
Rosin RIFT VALLEY LAKES
La* ri O7”O3* 1 ong E. 38-29*
’ kv'Jlion            1760
DetOil Evaporation 
IM Cm.
r~
Year 1 Jan
1
Mar
Apr
May
• • 1'
1—
f: i !*
1
mlih
1972
1373
1974
14 2
178
15.8
— . —
Feb
12.2
17.0
13.7
15.3
23,2
—
12.3       10 5        13.3       14.8
9.4 10.3 15.8 14. 0
175 4
i
—
15.3
18.8
14.8
I
1
12.1
15.2
12.3
June
13.5
10.8
10.2
July
12.3
Au i
13.3
10.8
—. -
• • — t - - - ~               ~
... . — -_
—
—
—
—
—
■----------
• -■ --------
—
—
—
—
—
—
-------
—
------------
------ --------
•
—-—
—
—
—
—-------
—
—
—
—
--------------
—
—
—
—
--
—
-
—
--
J_______
________
________
X Outside Bllate BasinCLIMATLC_DAIA.
Lot. N. -2ZL--—
--------------------------- Long. E.
*"7m)'
Station at awassa ■* Basin f.IFT VALLAI— _£kes_ Elevation
l
Detail Ave, Minimum Tempe.caf ur_e Unit — -
c
Year
Jon.
Feb.
Mar.
Apr.
Moy.
Juno
July
Aug.
Sept
Oct
Nov
Doc.
Total
Rrmorks
1966
7.1
11.9
10. 5
12.6
11 • ,1
II. 1
13.0
11.9
r 12.0
II.1
53
4.8
1967
4.0
70
10.8
12.6
13.6
12.6
13 8
12.6
12.1
11.2
10.8
2. 8
1968
1.6
12.5
9 .3
10.9
10.4'
•' 12.6
—
II .5
II. 1
9.7
— .
8.4
1969
9 .5
II. 8
14.1
12.2
12.3
• 11.8
—
—
—
—
—
—
1970
13.2
12.1
14.6
14.8
14.1
, 14.7
13 .9
14.4
14 .2
14.0
1.8
7. 8
\
1971
11 .2
12.6
12.5
—
I3.3
14.1
14.0
13.6
13.0
13. 1
10.3
8.8
1972
10.0
12 . 6
II .3
13.7
I2.9
13.3
—
13.4
12.8
II. 1
10. 9
10.8
I
1978
11.6
10. 8
11.7
13.8
I4 . 5
14.2
13.8
.14.2
13.6
II . 7
9 .5
5.6
1 • * 1
1974
9.3
II . 2-<
13.9 X
Ilk 4
I3.6
12.6
•
!’
•x      I
1.
1
1
u
• •. '
V. z
I-   ■
''1
1
<
»1
1
** *
’< ...
•' ■■
• 1
1
•
*
-*—' —• 
.
I
*Lat. N.
07           03
CLIMATIC DATA
Slotion at _AWASSA_* Basin RIFT valley_LAkes
Detail Ave. Doily Temperoture_________ Unit °C
Elevation 
Long.E.       38"        29’
J 760._____ ,(m)
rear
-
Jan / Feb
Mar
Apr I May. 1 June
1-----
.
July
Ana.
Sept
Oct
f Nov
Dnc         Total             Remarks
1966
1967
I960
1969
1970
1971
1972
1973
1974
18. 6       2 0.4 17.0   I 19.2 15.7       20.5
19.4        20-1
20.2        20. 6 19.4       20. 0 19.0      10 . 9
20 4       21. 2
19 .3       20.6
20.0
20.0
21.2
19.0
20.7
20.2
20. 6
19.6
22. 6
20.6X
2 0.7
19.7
20.7
20.6
—
19 .3 22.6
20.4
19.5       10.6
20,4      pl9. 0
19. 0       20.2
1 20. 4     19. 4
20.4   ' 19 . 8
19. 0     10.6
19.4       10 . 6 21. 2        20.2 20.0        19 2
19.2
19.4
—
—
io . a 10.4
—
19.0
IB . 4 19.0
19. 1
—
10 . 2 17.9
10.3 18. 9
10.7 10. 0 10 0
—
19.0
10.2
16.8
19.5
18.9
10.0
19.0
—
19. 5 19.6
10 . 0 19.0
16.0
18.4
—
—
17. 5
17.0
10 9 19 . 1
16.8
15.1
18 . 7
—
17 . 0
17. 3
19 . 6
16.6
•
.1
_ -■ --
------- 1.
z..
-
X- Outside Bilote Basinf
»
40
Lat.' N. LonaCE
Elevation _J?50—
t
Station at AWASA *-
• • 
4----------------hi
4
‘
CLIMATIC DATA
Basin Rift Volley Lakes
Defall JXV<L^Maxlmuni_.Tompcr_atutfl___  Unit °C
Year
Jan.
^Feb.
• Mar.
Apr.
June
July
Aug.
Sept
Oct
Nov.
Doc.
Totbf
Remarks
i
1966
30. 1
28,9
2 9.6
27.1
27.9
26.0
2 5.4
2 4.8
2 5.4
26.7
20.2
28.8
'
1967
2 9.3
31 .3
31.8
28.8
27.2
2,6.9
25.0
25.3
25.6
2G.4
26.1
27 4
1•I
1968
t?
29.8
28.5
28.7
2 8.5
29.3
27.8
—
26.7
26.6
28.2
—
2 9.0
I
1969
29.3
28.4
27.3
29. 2
26.6
27.1
—
—
----
4
—
—
—
-1970
27.1
29.0
25.7
26.4
2 6.6
24,6
2 2.8
21.9
23.7
.25.0
27.2
27.7
.•
j
1971
27.5
28.9
28.6
24.6
23.2
22.8
22.2
23.5
24.2
25.2
-25.8
,1 j--1
t'           ‘
1
,rJ1 •• ,
1972
28.0
25.2
27.8
24.9
25.9
24.0
—
23.2
20.8
25.0
26.9
28.4
1 ■>:
1973
29.1-
31.7
*3.4
31.3
27.8
25.7
24.3
23.6
25.4
2C.4
26.7
27.6
'•■'•I' r
1974
2C.3
30.0
29.4
26.5
25.7
.-
<*
-X
.r ••
•         i •..
•
■ i .1,. :A..
•
♦ * u
•»
■*
7/
• - ‘. •• •
• < • ’
• "!* * • ’
j
’/< *
”
1
>
•
-• 11
• . >
■ • -
‘
<4..; ■■
■
t       •'        '
l‘ »;
1
r t -
*
•
i’•?
•
•
••
>
• t - \r -
•
• *1 . G
1 >• r »
L
-K- Outside BHate Basin * 24 days overago . i
•    t
/•!
.1•■
r••Henri and T'• I i J iniilhly in’ Zdimri I I lows n r
Bilate llivr.r at Alaba Col i to
Year
Jan.
Fob.
Ma r.
Apr.
May
Jun.
Jill .
Ann.
p.
Ch'l .
Nov.
Dec.
To1 al
106 cu.m.
Average flow cu.m./sec.
0.38
0.46
1.61
1.65
5.42
14.33
24. «6
34.30
43.7'’’
20.68
5.61
1.14
12.96
1971
Total flov/
10^cu.m.
1.55
1.11
3.78
4.26
4.53
37.15
66,86
91.85
113.48
55.38
14.55
3.86
408.36
1972
Avernf'r flow cu.m./sec.
0.71
3.20
2.84
6.48
7.63
4.77
14.12
35.96
34.81
14.11
2.19
0.58
10.68
Total flow 106 cu.m.
1.91
7.99
7.60
29.02
’0.43
12.37
37.83
96.31
90 <22
37.79
5.68
1.54
348.69
Average flow cu.m./sec.
0.49
0.28
0.20
0.21
2.11
1.80
7.40
1973
24.09
44.77
24.57
5.46
1.05
9.41
Tol.pl flow 10^ cu.m.
1.31
0.67
0.54
0.54
5.65
4.67
19.83
64.51
116.03 J
65.81
4.16
?.82 -------- u
296.54
Average Annual Flow for 1971-1973: 351.20 X 10^ cu.m or
11.2 cu.m./sec.
iETHIOPIAN VALLEYS DEVELOPMENT STUDIES AUTHORITY
LIBRARY
DATE DUE
DATE DUE
•*

Summery

Bilate River Basin Development Study

Volume II: Hydro-Meteorological Data

Document Overview

Authors: D. Jovanovic (Civ. Eng.) and Teclegiorgis Goitom (Civ. Eng.)

Publisher: National Water Resources Commission, Executive Organ

Location: Addis Ababa, Ethiopia

Date: July 1974

Key Findings

Contains hydrometeorological data from stations within the Bilate River Basin and neighboring basins
Seven meteorological stations in Bilate catchment (classes 2-4, no 1st class stations)
Only two hydrological stations in Bilate Basin: Shashemene Soddo bridge and Biletentene Bridge
Alaba Colito Station has automatic water level recorder and cableway (3 years of flow measurements)
Detailed station information including location, elevation, operating organization, and duration of records

Station Classification System

Class	Equipment
1st Class	Maximum/Minimum thermometers, dry/wet-bulb thermometers, thermograph, hydrograph, rain-gauges, barometer, solar thermometers, evaporation pan, anemometer, sunshine recorder
2nd Class	Maximum/Minimum thermometers, dry/wet-bulb thermometers, evaporation pan, anemometers, rain-gauges
3rd Class	Maximum/Minimum thermometers and standard rain-gauge
4th Class	Standard rain-gauge only

Data Coverage

The document contains extensive tables of:

Rainfall data (monthly and annual) for multiple stations
Temperature data (minimum, maximum, and daily averages)
Evaporation measurements
River flow data for Bilate River at Alaba Collto (1971-1973)

Example Flow Data (Bilate River at Alaba Collto):

Average Annual Flow for 1971-1973: 351.20 × 10⁶ m³ or 11.2 m³/sec