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Nagai

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Nagai completed
Nagai completed

Particulars

Owner: Ministry of Land, Infrastructure and Transport

Designer: Ministry of Land, Infrastructure and Transport

Contractor: Hazama-Gumi Co. Ltd., Maeda Construction Kogyo Co Ltd. & Okumur-Gumi Co. Ltd. JV

Statistics

Type: Gravity

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

Reservoir capacity: 51 m3x106

Height: 126 metres

Length: 381 metres

Volume of RCC: 703 m3x103

Total volume: 1200 m3x103

Construction Dates

Start of Project: 03/00 (March 2000)

Start of RCC: 10/02 (October 2002)

End of RCC: 11/06 (November 2006)

End of Project: 03/11 (March 2011)

Country: Japan

River: Okitamano

DMS Co-ordinates: 38˚6'3.64"N, 139˚57'27.08"E

DD Co-ordinates: 38.101009, 139.957520

Facings

Upstream

SlopeType
VerticalTraditional concrete against formwork
0.50Traditional concrete against formwork

Downstream

SlopeType
0.73Traditional concrete against formwork

Spillway

SlopeType
0.73Traditional concrete against formwork

Placement

Layers (mm)Lifts (mm)
2501000

Cementitious material

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