Mianhuatan Dam

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Mianhuatan Dam
China edcp relief location map.jpg
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Location of Mianhuatan Dam in China
Country China
Location Yongding County, Fujian Province
Coordinates 24°39′40″N116°35′45″E / 24.66111°N 116.59583°E / 24.66111; 116.59583 Coordinates: 24°39′40″N116°35′45″E / 24.66111°N 116.59583°E / 24.66111; 116.59583
Status In use
Construction began 1998
Opening date June 2002
Dam and spillways
Type of dam Concrete gravity
Impounds Tingjiang River
Height 113 metres (371 ft)
Length 308.5 metres (1,012 ft)
Width (crest) 7 metres (23 ft)
Dam volume 615,000 cubic metres (21,718,520 cu ft)
Spillway type Service, gate-controlled on crest
Reservoir
Creates Mianhuatan Reservoir
Total capacity 1,698,000,000 cubic metres (1,376,591 acre⋅ft)
Catchment area 7,907 square kilometres (3,053 sq mi)
Surface area 64 square kilometres (25 sq mi)
Power Station
Turbines 4 x 150 MW Francis-type
Installed capacity 600 MW

The Mianhuatan Dam is a concrete gravity dam on the Tingjiang River in Yongding County, Fujian Province, China. The dam is 113 metres (371 ft) tall and composed of roller-compacted concrete. The main purpose of the dam is hydroelectric power generation and it supports a power station with 4 x 150 MW generators for a combined capacity of 600 MW. Other purposes of the dam include flood control, navigation and irrigation. Construction began in 1998 and the project was completed in June 2002. [1]

Gravity dam

A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily using the weight of the material alone to resist the horizontal pressure of water pushing against it. Gravity dams are designed so that each section of the dam is stable, independent of any other dam section.

China Country in East Asia

China, officially the People's Republic of China (PRC), is a country in East Asia and the world's most populous country, with a population of around 1.404 billion. Covering approximately 9,600,000 square kilometers (3,700,000 sq mi), it is the third- or fourth-largest country by total area. Governed by the Communist Party of China, the state exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities, and the special administrative regions of Hong Kong and Macau.

Roller-compacted concrete

Roller-compacted concrete (RCC) or rolled concrete (rollcrete) is a special blend of concrete that has essentially the same ingredients as conventional concrete but in different ratios, and increasingly with partial substitution of fly ash for Portland cement. The partial substitution of fly ash for Portland Cement is an important aspect of RCC dam construction because the heat generated by fly ash hydration is significantly less than the heat generated by Portland Cement hydration. This in turn reduces the thermal loads on the dam and reduces the potential for thermal cracking to occur. RCC is a mix of cement/fly ash, water, sand, aggregate and common additives, but contains much less water. The produced mix is drier and essentially has no slump. RCC is placed in a manner similar to paving; the material is delivered by dump trucks or conveyors, spread by small bulldozers or specially modified asphalt pavers, and then compacted by vibratory rollers.

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References

  1. "Mianhuatan" (PDF). Chinese National Committee on Large Dams. Retrieved 7 January 2011.