Otori Dam

Dam in Tadami
37°12′53″N 139°12′50″E / 37.21472°N 139.21389°E / 37.21472; 139.21389StatusOperationalConstruction began1961Opening date1963Owner(s)Electric Power Development CompanyDam and spillwaysType of damArch-gravityImpoundsTadami RiverHeight83 m (272 ft)Length188 m (617 ft)ReservoirTotal capacity15,800,000 m3 (12,809 acre⋅ft)Active capacity5,000,000 m3 (4,054 acre⋅ft)Catchment area656.9 km2 (254 sq mi)Surface area89 ha (220 acres)[1]Power StationCommission date1963, 2003Hydraulic headUnit 1: 50.8 m (167 ft)
Unit 2: 48.1 m (158 ft)Turbines1 x 95 MW, 1 x 87 MW Kaplan-typeInstalled capacity182 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.[2]

See also

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References

  1. ^ "Otori Dam" (in Japanese). DamMania. 20 June 2009. Retrieved 15 August 2011.
  2. ^ "Case study 01-02: Biological Diversity – Okutadami and Ohtori Expansion Hydropower Project, Japan" (PDF). IEA Hydropower Implementing Agreement Annex VIII: Hydropower Good Practices: Environmental Mitigation Measures and Benefit. New Energy Foundation. 2006. Archived from the original (PDF) on 3 October 2011. Retrieved 14 August 2011.
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