Koysha (Gibe IV)
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Koysha (Gibe IV) on Google Earth
Particulars
Owner: Ethiopian Electric Power (EEP)
Designer: Studio Petrangelli
Contractor: WeBuild-WB (Salini - Impregilo SpA)
Statistics
Type: Gravity
Purpose(s): Hydropower
Reservoir capacity: 6900 m3x106
Height: 201 metres
Length: 1020 metres
Volume of RCC: 7350 m3x103
Total volume: 7725 m3x103
Construction Dates
Start of Project: 09/13 (September 2013)
Start of RCC: 06/20 (June 2020)
End of RCC: 02/27 (February 2027)
End of Project: 05/28 (May 2028)
Country: Ethiopia
River: Omo
DMS Co-ordinates: 6˚34'40.88"N, 36˚32'59.04"E
DD Co-ordinates: 6.578022, 36.549732
Facings
Upstream
| Slope | Type |
|---|---|
| 0.10 | RCC against formwork (GEVR/GE-RCC) |
| 0.35 |
Downstream
| Slope | Type |
|---|---|
| 0.70 | RCC against formwork (GEVR/GE-RCC) [stepped face] |
Spillway
| Slope | Type |
|---|---|
| separate |
Placement
| Layers (mm) | Lifts (mm) |
|---|---|
| 300 | 1500 |
Cementitious material
| Cement (kg/m3) |
|---|
| 130 |
| Pozzolan (kg/m3) | Pozzolan Type |
|---|---|
| 25 | Natural pozzolan (ASTM Class N) |
