Sirikit Dam

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Sirikit Dam
Sirikitdam 01.jpg
The dam's power station at its base
Thailand location relief map.svg
Red pog.svg
Location of Sirikit Dam in Thailand
Official nameQueen Sirikit Dam
Country Thailand
Location Tha Pla, Uttaradit
Coordinates 17°45′50″N100°33′48″E / 17.76389°N 100.56333°E / 17.76389; 100.56333 Coordinates: 17°45′50″N100°33′48″E / 17.76389°N 100.56333°E / 17.76389; 100.56333
StatusIn use
Construction began1968
Opening date1974
Owner(s) Electricity Generating Authority of Thailand
Dam and spillways
Type of dam Embankment
Impounds Nan River
Height113.6 m (373 ft)
Length800 m (2,625 ft)
Width (crest)12 m (39 ft)
Width (base)630 m (2,067 ft)
Spillway typeTunnel, service
Spillway capacity3,250 m3/s (114,773 cu ft/s)
Reservoir
CreatesSirikit Reservoir
Total capacity9,510,000,000 m3 (7,709,882  acre⋅ft)
Active capacity6,668,000,000 m3 (5,405,836  acre⋅ft)
Catchment area 13,130 km2 (5,070 sq mi)
Surface area259 km2 (100 sq mi)
Power Station
Commission date1974, 1995
Hydraulic head 75.4 m (247 ft) (rated)
Turbines 4 x 125 MW Francis-type
Installed capacity 500 MW

The Queen Sirikit Dam is an embankment dam on the Nan River, a tributary of the Chao Phraya River, in Tha Pla District, Uttaradit Province, Thailand. It is at the southeastern edge of the Phi Pan Nam Range. The dam was built for the purpose of irrigation, flood control and hydroelectric power production. It is named after Sirikit, Queen of Thailand. [1]

Contents

Background

The Sirikit Dam among others in the Chao Phraya basin were constructed beginning in the 1950s to exploit the agricultural and hydroelectric potential of the basin. Preliminary construction on the dam began in 1968 and it was finished in 1972. The power plant and first three units were commissioned in 1974, the fourth in 1995. [2] Previously in 1964, the Bhumibol Dam was completed on the Ping River, one of two major tributaries of the Chao Phraya including the Nan. The Bhumibol and Sirkit Dams control 22% of the Chao Phraya's annual runoff combined. [3] Both dams also help provide for the irrigation of 1,200,000 ha (4,633 sq mi) in the wet season and 480,000 ha (1,853 sq mi) in the dry season. [4]

Design

The dam is a 113.6 m (373 ft) high and 800 m (2,625 ft) long embankment dam that is 630 m (2,067 ft) wide at its base and 12 m (39 ft) wide at its crest. The dam withholds a reservoir of 9,510,000,000 m3 (7,709,882  acre⋅ft ) of which 6,666,000,000 m3 (5,404,214  acre⋅ft ) is active or "useful" storage. The reservoir has a surface area of 259 km2 (100 sq mi). [2] The dam's spillway consists of a tunnel controlled by two radial gates, it has a capacity of 3,250 m3/s (114,773 cu ft/s). The dam's power station contains 4 x 125 MW Francis turbines for an installed capacity of 500 MW. [1] [2]

Panorama of the Sirikit Dam, with on the right, the reservoir of the Nan River Sirikit Dam panorama January 2014.jpg
Panorama of the Sirikit Dam, with on the right, the reservoir of the Nan River

See also

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References

  1. 1 2 "Hydroelectric Power Plants in Thailand". Industcards. Retrieved 6 March 2011.
  2. 1 2 3 "Sirikit Dam". Electricity Generating Authority of Thailand. Retrieved 6 September 2016.
  3. "Chao Phraya River Basin (Thailand)". UNESCO. p. 293. Retrieved 6 March 2011.
  4. "Bhumibol Dam". Royal Irrigation Department - Thailand. Archived from the original on 17 September 2008. Retrieved 6 March 2011.