Hayachine Dam

The Hayachine Dam (早池峰ダム, Hayachine damu) is a multi-purpose dam on the Hienuki River, a branch of the Kitakami River, located in the city of Hanamaki, Iwate Prefecture in the Tōhoku region of northern Japan. It managed by Hanamaki Civil Engineering Center, Minami Kunisaki Promotion Department, and is a gravity-type concrete dam with a bank height of 73.5 meters.

Hayachine Dam
Location of Hayachine Dam in Japan
Official name	早池峰ダム
Location	Hanamaki, Iwate, Japan
Coordinates	39°31′53″N 141°20′22″E
Construction began	1982
Opening date	2000
Operator(s)	Iwate Prefecture
Dam and spillways
Type of dam	Concrete gravity dam
Impounds	Hienuki River
Height	73.5 meters
Length	390.0 meters
Reservoir
Creates	Hayachine Lake
Total capacity	15,750,000 m3
Catchment area	71.5 km2
Power Station
Operator(s)	Iwate Prefecture
Annual generation	3000 KW

History

Hayachine Dam is one a series of five multipurpose dams built directly on the Kitakami River and its major tributaries, starting with the Tase Dam in 1941. The dam was intended to provide industrial and drinking water for the growing city of Hanamaki, as well as irrigation water, flood control and hydroelectric power. The dam was completed by the Kajima Corporation in 2000.

Design

The Hayachine Dam is a concrete gravity arch dam. The associated hydroelectric power plant has an installed capacity of 3000 KW.

References

• Japan Commission on Large Dams. Dams in Japan: Past, Present and Future. CRC Press (2009). ISBN 978-0-415-49432-8
• photo page with data ((in Japanese)
• Iwate Prefectural home page Archived 2014-05-19 at the Wayback Machine (in Japanese)
• Kajima Corporation Home page (in Japanese)