Koysha (Gibe IV)

Particulars

Owner: unknown

Designer: WeBuild-WB (Salini - Impregilo SpA)

Contractor: WeBuild-WB (Salini - Impregilo SpA)

Purpose(s): Hydropower

Reservoir capacity: 14700 m³x10⁶

Height: 168 metres

Length: 1000 metres

Volume of RCC: 7400 m³x10³

Total volume: 7400 m³x10³

Start of Project: 09/13 (September 2013)

Start of RCC: 06/20 (June 2020)

End of RCC: —/23 (— 2023)

End of Project: —/24 (— 2024)

Country: Ethiopia

River: Omo

DMS Co-ordinates: 6˚34'40.88"N, 36˚32'59.04"E

DD Co-ordinates: 6.578022, 36.549732

Slope	Type
0.10	RCC against formwork (GEVR/GE-RCC)
0.35

Slope	Type
0.70	RCC against formwork (GEVR/GE-RCC) [stepped face]

Slope	Type
separate

Layers (mm)	Lifts (mm)
400	400

Cement (kg/m³)
57 to

Pozzolan (kg/m³)	Pozzolan Type
23 to	Natural pozzolan (ASTM Class N)