Guangzhao Dam

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Guangzhao Dam
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Location of Guangzhao Dam in China
Country China
Location Guangzhao, Guanling County, Guizhou Province
Coordinates 25°57′34″N105°15′03″E / 25.95944°N 105.25083°E / 25.95944; 105.25083 Coordinates: 25°57′34″N105°15′03″E / 25.95944°N 105.25083°E / 25.95944; 105.25083
Status In use
Construction began May 2003
Opening date 2008
Dam and spillways
Type of dam Gravity
Impounds Beipan River
Height 200.5 metres (658 ft)
Length 410 metres (1,345 ft)
Dam volume 2,800,000 cubic metres (98,881,067 cu ft)
Spillways 3
Spillway type Service, surface crest
Spillway capacity 9,857 cubic metres per second (348,097 cu ft/s)
Reservoir
Creates Guangzhao Reservoir
Total capacity 3,254,000,000 cubic metres (2,638,061 acre⋅ft)
Catchment area 13,548 square kilometres (5,231 sq mi)
Surface area 51.54 square kilometres (20 sq mi)
Power Station
Installed capacity 1,040 MW
Annual generation 2,745 GWh (mean)

The Guangzhao Dam is a concrete gravity dam on the Beipan River near Guangzhao in Guanling County, Guizhou Province, China. The main purpose of the project is hydroelectric power generation with additional purposes of water regulation and irrigation. It creates the uppermost or head reservoir on the Beipan and was constructed between 2003 and 2008.

Dam A barrier that stops or restricts the flow of surface or underground streams

A dam is a barrier that stops or restricts the flow of water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aquaculture, and navigability. Hydropower is often used in conjunction with dams to generate electricity. A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. The earliest known dam is the Jawa Dam in Jordan, dating to 3,000 BC.

Beipan River river in the Peoples Republic of China

Beipan River is a river in Guizhou and Yunnan provinces, China, and part of the great Pearl River basin.

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.

Contents

Construction

Construction on the dam began in May 2003 and the river was diverted in October 2004. [1] Reservoir filling began in 2007 and by 2008, the dam and power plant were complete. On June 28, 2010, a landslide in the area of the dam that killed 99 locals was believed to be caused by seismic effects from the reservoir. [2]

Specifications

The dam is 200.5 metres (658 ft) tall and 410 metres (1,345 ft) wide and composed of roller-compacted concrete. It also contains three spillway chutes on its surface. Each spillway is controlled by a 16 metres (52 ft) wide and 20 metres (66 ft) tall floodgate and they have a combined maximum discharge of 9,857 cubic metres per second (348,097 cu ft/s). The dam also contains a bottom outlet works for draining the reservoir which a maximum discharge capacity of 799 cubic metres per second (28,216 cu ft/s). [1]

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. 1 2 "Guangzhao Hydropower Project" (PDF). Chinese National Committee on Large Dams. Retrieved 8 January 2011.
  2. ↑ Xiao, Fan (July 15, 2010). "Chinese dam played role in deadly landslide". International Probe. Retrieved 8 January 2011.
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