The Ōmachi Dam is a concrete gravity dam on the Takase River just west of Ōmachi in Nagano Prefecture, Japan. Construction of the dam began in 1975 and it was completed in 1985. The primary purpose of the dam is water supply and it also supports a 13 MW hydroelectric power station.[3] It is owned by TEPCO.[1]

Ōmachi Dam
Location of Ōmachi Dam in Japan
Country	Japan
Location	Ōmachi
Coordinates	36°30′53″N 137°46′53″E
Status	Operational
Construction began	1972
Opening date	1985
Owner(s)	TEPCO
Dam and spillways
Type of dam	Gravity
Impounds	Takase River
Height	107 m (351 ft)
Length	338 m (1,109 ft)[1]
Dam volume	766,000 m3 (1,001,890 cu yd)
Spillways	2
Spillway type	4 x radial gates
Spillway capacity	1,910 m3/s (67,451 cu ft/s)
Reservoir
Total capacity	33,900,000 m3 (27,483 acre⋅ft)
Active capacity	28,900,000 m3 (23,430 acre⋅ft)
Surface area	110 ha (272 acres)
Normal elevation	898 m (2,946 ft)[2]
Power Station
Commission date	April 1985
Hydraulic head	63.4 m (208 ft)
Turbines	1 x 13 MW Francis-type
Installed capacity	13 MW

See also

• Shin-Takasegawa Pumped Storage Station - upstream

References

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