Xiaowan Dam
Script error: No such module "Type in location".Script error: No such module "Infobox".Template:Template otherScript error: No such module "Check for unknown parameters".Expression error: Unexpected < operator. The Xiaowan Dam (Template:Zh) is an arch dam on the Lancang (Mekong) River in Nanjian County, Yunnan Province in southwest China. The primary purpose of the dam is hydroelectric power generation and it supports a 4,200 MW power station. Constructed between 2002 and 2010 by Huaneng Power International at a cost of ¥32 billion (nearly US$3.9 billion), it is the world's second highest arch dam at Script error: No such module "convert".. It is also third highest among dams of all types behind Jinping-I and Nurek and the third largest hydroelectric power station in China.[1][2][3][4]
Background
The feasibility study for the dam was completed in 1992, with it as part of the Lancang River Project. In 1995 the report was reviewed and approved by the Chinese government. Three years later in 1998, a consortium to fund and construct the dam was organized. In 1999, preliminary construction (roads, bridges, river diversion) began. Official construction on the dam started on 1 January 2002. The river was diverted by November 2003 and concrete pouring began in 2005. The river diversion was closed and the reservoir began to impound in November 2007.[5] The first generator was commissioned in September 2009 and the dam was complete in March 2010.[2][6] The last of the six generators went operational on 22 August 2010.[7] The creation of the dam's reservoir submerged Script error: No such module "convert". of land and displaced 32,737 people.[5]
Specifications
The Xiaowan Dam is a Script error: No such module "convert". tall and Script error: No such module "convert". long double-curvature arch dam. Its crest is Script error: No such module "convert". wide while the base sits at Script error: No such module "convert". in width. The dam's crest is at an elevation of Script error: No such module "convert". while the normal reservoir level is slightly lower at Script error: No such module "convert".. The dam's reservoir has a normal storage capacity of Script error: No such module "convert".; of that capacity, Script error: No such module "convert". is active (or "useful") storage. The dam traps water from a catchment area covering Script error: No such module "convert".. The surface of the reservoir at normal level covers Script error: No such module "convert"..[5]
Helping to control floods, the dam has two spillways, 5 gates near the crest and a tunnel on the left bank. The gates can discharge up to Script error: No such module "convert". while the tunnel has a maximum discharge of Script error: No such module "convert".. In the middle portion of the dam, there are six orifice openings that can discharge Script error: No such module "convert".. In addition, the dam can release additional water and sediment with two bottom outlets. All of the dam's outlets including the power station give it a maximum flood discharge of Script error: No such module "convert"..[5]
On the right bank of the dam is the power station intake which receives water into six Script error: No such module "convert". diameter penstocks which each feed a 700 MW Francis turbine-turbine in the underground power station. The drop in elevation from the intake to the turbine affords a maximum hydraulic head of Script error: No such module "convert".. Once discharged by the turbine, the water is sent down one of two Script error: No such module "convert". diameter tailrace tunnels towards the river.[5]
See also
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- List of power stations in China
- List of tallest dams in the world
- List of tallest dams in China
- List of dams and reservoirs in China
References
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- Pages with script errors
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- Hydroelectric power stations in Yunnan
- Dams in the Mekong River Basin
- Dams in China
- Arch dams
- Dams completed in 2010
- Underground power stations
- 2010 establishments in China
- Energy infrastructure completed in 2010
- Buildings and structures in Dali Bai Autonomous Prefecture
- Buildings and structures in Lincang