Otori Dam

Otori Dam
File:Otori Dam survey 1976.jpg The dam in 1976
Location of Otori Dam in Japan
Country	Japan
Location	Tadami
Coordinates
Status	Operational
Construction began	1961
Opening date	1963
Owner(s)	Electric Power Development Company
Dam and spillways
Type of dam	Arch-gravity
Impounds	Tadami River
Height	83 m (272 ft)
Length	188 m (617 ft)
Reservoir
Total capacity	15,800,000 m3 (12,809 acre⋅ft)
Active capacity	5,000,000 m3 (4,054 acre⋅ft)
Catchment area	656.9 km2 (254 sq mi)
Surface area	89 ha (220 acres)
Power station
Commission date	1963, 2003
Hydraulic head	Unit 1: 50.8 m (167 ft) Unit 2: 48.1 m (158 ft)
Turbines	1 x 95 MW, 1 x 87 MW Kaplan-type
Installed capacity	182 MW

The Otori Dam (大鳥ダム, Ōtori damu) is a concrete arch-gravity dam on the Tadami River, 17 km (11 mi) southwest of Tadami in Fukushima Prefecture, Japan. The primary purpose of the dam is hydroelectric power generation and it supports a 182 MW power station. The power station contains two Kaplan turbine-generators. Unit 1 (95 MW) was commissioned on 20 November 1963 while Unit 2 (87 MW) was commissioned on 7 June 2003 as part of a power plant expansion project that included an additional 200 MW generator at Okutadami Dam upstream. The dam is 83 m (272 ft) tall and 188 m (617 ft) long. Its reservoir has a 15,800,000 m³ (12,809 acre⋅ft) capacity of which 5,000,000 m³ (4,054 acre⋅ft) is active (or "useful") for power generation. The reservoir has a catchment area of 656.9 km² (254 sq mi) and surface area of 89 ha (220 acres). Of the two generators, Unit 1 has a maximum effective hydraulic head of 50.8 m (167 ft) and Unit 2 is afforded 48.1 m (158 ft). The design flood discharge of the dam is 2,200 m³/s (77,692 cu ft/s) and its service spillway is controlled by three tainter gates.

See also

• List of power stations in Japan
• Tagokura Dam – located downstream