The Fukashiro Dam is a

gravity dam A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation. Gravity dams are designed so that each section of the dam is ...

in the

Sagami River The is a river in Kanagawa and Yamanashi Prefectures on the island of Honshū, Japan. The upper reaches of the river in Yamanashi prefecture are also sometimes known as the , and the portion near the river mouth as the . The river overall was ...

system, located north of Ōtsuki in

Yamanashi Prefecture is a prefecture of Japan located in the Chūbu region of Honshu. Yamanashi Prefecture has a population of 787,592 (1 February 2025) and has a geographic area of 4,465 km2 (1,724 sq mi). Yamanashi Prefecture borders Saitama Prefecture to the n ...

, Japan. The purpose of the dam is

flood control Flood management or flood control are methods used to reduce or prevent the detrimental effects of flood waters. Flooding can be caused by a mix of both natural processes, such as extreme weather upstream, and human changes to waterbodies and ru ...

and water supply. Plans for the dam were drawn up in 1978 and construction on the diversion tunnels began in 1996. The dam reached its height in 2001 and in 2003, the reservoir began to fill. By 2004, the entire dam was complete. It is tall and long at the crest. The dam's main

spillway A spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself. In the United Kingdom, they may be known as overflow channels. Spillways ensure tha ...

consists of five free overflow openings with a discharge capacity. To handle additional discharges, there are two additional openings on the dam's orifice and two jet flow openings as part of the

outlet works A gatehouse, gate house, outlet works or valve house for a dam is a structure housing sluice gates, valves, or pumps (in which case it is more accurately called a pumping station). Many gatehouses are strictly utilitarian, but especially in the ni ...

References

{{Dams in Yamanashi Prefecture Dams in Yamanashi Prefecture Gravity dams Dams completed in 2004

See also

References