Koyama
Download PDF data sheet
Koyama completed
Particulars
Owner: unknown
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
| Slope | Type |
|---|---|
| Vertical | Traditional concrete against formwork |
Downstream
| Slope | Type |
|---|---|
| 0.78 | Traditional concrete against formwork |
Spillway
| Slope | Type |
|---|---|
| 0.78 | Traditional concrete against formwork |
Placement
| Layers (mm) | Lifts (mm) |
|---|---|
| 250 | 750 |
Cementitious material
| Cement (kg/m3) |
|---|
| 84 |
| Pozzolan (kg/m3) | Pozzolan Type |
|---|---|
| 36 | Ground-granulated blast-furnace slag |
