Tamahara Dam

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Tanbara Dam (玉原ダム, which can be mistakenly read Tamahara Dam[1]) is a rock-fill embankment dam impounding the headwaters of the Hotchi River, a Tone River tributary in Gunma Prefecture of Japan. It is located 14 kilometres (8.7 mi) north of Numata. It creates the upper reservoir for the 1,200 megawatts (1,600,000 hp) Tamahara Pumped Storage Power Station (玉原発電所). Construction began in 1973 and the dam was complete in 1981 while the power station was commissioned in 1986. It is 116 metres (381 ft) tall and withholds a reservoir with a storage capacity of 14,800,000 m3 (11,999 acre⋅ft). Of that capacity, 13,000,000 cubic metres (11,000 acre⋅ft) is active (or useful) for power generation. The lower reservoir for the pumped-storage power station is created by the Fujiwara Dam, located 4 km (2 mi) to the northwest on another Tone River tributary. Power is generated during periods of high energy demand and pumping occurs during times when energy demand is low such as at night. The power station contains four 300 megawatts (400,000 hp) reversible Francis turbine pump-generators which serve to both pump water and generate electricity. The upper Tamahara Reservoir is at an elevation of 1,177 metres (3,862 ft) and the lower Fujiwara Reservoir is at 651 metres (2,136 ft) which affords the power station an effective hydraulic head of 518 metres (1,699 ft). When pumping, the pump-generators can move up to 210 cubic metres per second (7,400 cu ft/s) of water and when generating, they discharge up to 276 cubic metres per second (9,700 cu ft/s).[2][1]

Tanbara Dam
Tamahara Dam is located in Japan
Tamahara Dam
Location of Tanbara Dam in Japan
CountryJapan
LocationNumata
Coordinates36°46′29″N 139°03′46″E / 36.77472°N 139.06278°E / 36.77472; 139.06278
StatusOperational
Construction began1973
Opening date1981
Owner(s)TEPCO
Dam and spillways
Type of damEmbankment, rock-fill
ImpoundsHotchi River
Height116 m (381 ft)
Length570.1 m (1,870 ft)
Elevation at crest1,177 m (3,862 ft)
Width (crest)12 m (39 ft)
Width (base)550 m (1,800 ft)
Dam volume5,435,000 m3 (7,109,000 cu yd)
Reservoir
Total capacity14,800,000 m3 (12,000 acre⋅ft)
Active capacity13,000,000 m3 (11,000 acre⋅ft)
Catchment area6.5 km2 (2.5 sq mi)
Surface area57 ha (140 acres)
Normal elevation1,173 m (3,848 ft)
Power Station
Commission date1986
Hydraulic head518 m (1,699 ft) (effective)
Turbines4 x 300 MW (400,000 hp) Francis pump-turbines
Installed capacity1,200 MW (1,600,000 hp)

See also

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References

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  1. ^ a b "Tokyo Electric Power Co. power plant Tamahara" (in Japanese). Suiryoku. Retrieved 17 February 2012.
  2. ^ "Hydropower & Dams in South and East Asia" (PDF). Hydropower and Dams. p. 9. Retrieved 3 October 2010.