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Home > Topics > Sameura Dam's Rehabilitation Project First Dam Rehabilitation Project of Japan Water Agency to be granted for 2018

Sameura Dam's Rehabilitation Project First Dam Rehabilitation Project of Japan Water Agency to be granted for 2018August 29, 2017

On August 29, 2017, MLIT released the evaluation result of the projects they would take up for FY2018 under their budget, and Sameura Dam's rehabilitation project was selected as one of them. Accordingly they will submit a request for the budget with a rough cost estimate at a later date. As Japan Water Agency (=JWA) is the key player of this project, we will proceed with Sameura Dam's rehabilitation project in full force upon official budget approval.
For your information, the summary of this rehabilitation project will be shown, as follows:
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
Location Map Reservoir capacity distribution Building additional outlet works


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