Aleltu Hydroelectric Project Summary
Project Overview
The Aleltu Hydroelectric Project is a prefeasibility study conducted by Acres International Limited for the Ethiopian Electric Light and Power Authority in June 1984. The study evaluates a complex configuration of interconnected reservoirs for hydroelectric power generation.
Key Components
- Multiple interconnected reservoirs
- Pressure tunnels and open channels
- Power tunnels and penstocks
- Powerhouse facilities
Document Structure
The study is presented in three volumes:
- Volume 1: Executive Summary
- Volume 2: Main Report
- Volume 3: Appendixes (the current document)
Technical Components
Layout Optimization Model
A mathematical model was developed to analyze the interactive operation of reservoirs and evaluate system alternatives. Key aspects include:
| Component | Description |
|---|---|
| Reservoir Operation | Rules for multireservoir system operation based on water balance |
| Cost Functions | Sizing and costing of structural components (dams, tunnels, etc.) |
| Energy Calculation | Capacity and energy production formulas |
| Optimization | Determining optimum reservoir elevation and component sizing |
Hydrological Studies
The study analyzed available hydrometric data and developed synthetic flow sequences due to limited streamflow records in the project area.
Key Findings:
- No reliable correlations found between rainfall and streamflow records
- Synthetic flow sequences developed using probabilistic methods
- Average reservoir evaporation losses estimated at 3.4% of runoff
- Flood flow studies conducted for construction diversion planning
Subbasin Characteristics
| Subbasin | Drainage Area (km²) | Mean Flow (m³/s) |
|---|---|---|
| Tiliku Aleltu | 458 | 5.57 |
| Jida | 749 | 8.16 |
| Gomoro | 225 | 2.41 |
| Robi | 437 | 4.29 |
Conclusions
The study provides a comprehensive prefeasibility analysis of the Aleltu Hydroelectric Project, including:
- Technical evaluation of alternative development schemes
- Hydrological assessments with limited data
- Cost estimates for project components
- Optimization models for reservoir operation
The results are considered acceptable for prefeasibility level evaluation, though future studies with additional streamflow observations are recommended for more accurate assessments.