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Gassan

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Gassan completed
Gassan completed

Particulars

Owner: Ministry of Construction

Designer: Ministry of Construction

Contractor: Nishimatsu Construction Co Ltd, Obayashi-Gumi Co Ltd and Tekken Construction Co Ltd J.V.

Statistics

Type: Gravity

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

Reservoir capacity: 65 m3x106

Height: 123 metres

Length: 393 metres

Volume of RCC: 731 m3x103

Total volume: 1160 m3x103

Construction Dates

Start of Project: 08/88 (August 1988)

Start of RCC: 06/94 (June 1994)

End of RCC: 10/98 (October 1998)

End of Project: 03/01 (March 2001)

Country: Japan

River: Bonji

DMS Co-ordinates: 38˚34'58.99"N, 139˚53'43.09"E

DD Co-ordinates: 38.583054, 139.895309

Facings

Upstream

SlopeType
VerticalTraditional concrete against formwork

Downstream

SlopeType
0.80Traditional concrete against formwork

Spillway

SlopeType
0.80Traditional concrete against formwork

Placement

Layers (mm)Lifts (mm)
250750
 1000

Cementitious material

Cement (kg/m3)
91
Pozzolan (kg/m3)Pozzolan Type
39Low-lime flyash (ASTM Class F)