| Location | Motoyama Town, Nagaoka County, Kochi Prefecture (Left bank) Tosa Town, Tosa County, Kochi Prefecture (Right bank) |
|---|---|
| Purpose | Flood control With the capacity change*1 and introduction of preparatory discharging method*2, flood control capacity will be increased from 90 million m³ to 107million m³ and a new outlet works will be added for the purpose of reinforcing the discharging capacity at the time of flood and upgrade the flood control function. *1 Capacity change means to secure the decent capacity, while securing the current water use safety and reviewing the operation of unspecified water supply. *2 Preparatory discharging method means that at the time the flood is predicted to occur sometime soon, the preparatory discharging of water from the dam reservoir is made to lower the water storage level to secure the certain water level for flood control in the future. |
| Legend | Type: Concrete gravity dam |
| Dam height: 106m | |
| Crest length: 400m | |
| Gross storage capacity: 316 million m³ | |
| Effective storage capacity: 289 million m³ | |
| Catchment area: 472km²(including taking 55km² of Asemi River water) | |
| Total project cost | approx. 40 billion yen |
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