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Koyama

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Koyama completed
Koyama completed

Particulars

Owner: Ibaraki Prefecture

Designer: Ibaragi-ken

Contractor: Kumagai-Gumi Co Ltd., Kabuki Construction Co Ltd and Suzunui Kogyo Co Ltd. J.V.

Statistics

Type: Gravity

Purpose(s): Flood Control / Irrigation / Water Supply

Reservoir capacity: 17 m3x106

Height: 65 metres

Length: 462 metres

Volume of RCC: 270 m3x103

Total volume: 531 m3x103

Construction Dates

Start of Project: 11/94 (November 1994)

Start of RCC: 05/00 (May 2000)

End of RCC: 12/02 (December 2002)

End of Project: 03/05 (March 2005)

Country: Japan

River: Ohkita

DMS Co-ordinates: 36˚47'48.34"N, 140˚38'37.12"E

DD Co-ordinates: 36.796761, 140.643646

Facings

Upstream

SlopeType
VerticalTraditional concrete against formwork

Downstream

SlopeType
0.78Traditional concrete against formwork

Spillway

SlopeType
0.78Traditional concrete against formwork

Placement

Layers (mm)Lifts (mm)
250750

Cementitious material

Cement (kg/m3)
84
Pozzolan (kg/m3)Pozzolan Type
36Ground-granulated blast-furnace slag