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Irahara

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Irahara under construction
Irahara under construction

Particulars

Owner: Fukuoka Prefecture

Designer: unknown

Contractor: Taisei Corp.

Statistics

Type: Gravity

Purpose(s): Flood Control / Water Supply

Reservoir capacity: 29 m3x106

Height: 81 metres

Length: 295 metres

Volume of RCC: 372 m3x103

Total volume: 419 m3x103

Construction Dates

Start of Project: 07/14 (July 2014)

Start of RCC: 07/15 (July 2015)

End of RCC: 03/18 (March 2018)

End of Project: 03/19 (March 2019)

Country: Japan

River: Harai

DMS Co-ordinates: 33˚34'59.92"N, 130˚56'53.55"E

DD Co-ordinates: 33.583309, 130.948212

Facings

Upstream

SlopeType
VerticalTraditional concrete against formwork
0.60Traditional concrete against formwork

Downstream

SlopeType
0.77Traditional concrete against formwork

Spillway

SlopeType
0.77Traditional concrete against formwork

Placement

Layers (mm)Lifts (mm)
2501000

Cementitious material

Cement (kg/m3)
84
Pozzolan (kg/m3)Pozzolan Type
36Low-lime flyash (ASTM Class F)