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Koysha (Gibe IV)

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Particulars

Owner: unknown

Designer: WeBuild-WB (Salini - Impregilo SpA)

Contractor: WeBuild-WB (Salini - Impregilo SpA)

Statistics

Type: Gravity

Purpose(s): Hydropower

Reservoir capacity: 14700 m3x106

Height: 168 metres

Length: 1000 metres

Volume of RCC: 7400 m3x103

Total volume: 7400 m3x103

Construction Dates

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

Facings

Upstream

SlopeType
0.10RCC against formwork (GEVR/GE-RCC)
0.35 

Downstream

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

Spillway

SlopeType
separate 

Placement

Layers (mm)Lifts (mm)
400400

Cementitious material

Cement (kg/m3)
57  to
Pozzolan (kg/m3)Pozzolan Type
23  toNatural pozzolan (ASTM Class N)