Abstract
The goal of the Masuda river flood control dam construction project is to construct Masuda river dam for flood control and to redevelop Sasakura dam for stable water intake and conservation of riverine environment. Masuda river dam, which was completed and in-service in FY2005, only for flood control, is rare in the country for equipped with steady drop inlet spillway at its bottom without gate. In this paper, the background of adopting the dam only for flood control; reallocating the storage capacity, which is the main characteristic of Masuda river dam, is reported. In addition, a brief overview of designing and constructing of the steady drop inlet spillway at the bottom is reported.
