Shuangjiangkou Dam
| Shuangjiangkou Dam | |
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Rendition of the dam
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 Location of Shuangjiangkou Dam in China
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| Country | China |
| Location | Border of Ma'erkang County and Jinchuan County within Ngawa Tibetan and Qiang Autonomous Prefecture, Sichuan Province |
| Coordinates | 31°47′32.58″N 101°55′19.94″E / 31.7923833°N 101.9222056°ECoordinates: 31°47′32.58″N 101°55′19.94″E / 31.7923833°N 101.9222056°E |
| Status | Under construction |
| Construction began | 2008 |
| Opening date | 2018 (est.) |
| Construction cost | US$4.02 billion (¥24.68 billion, £2.9 billion) |
| Owner(s) | State Power Dadu Hydropower Development Co., Ltd. |
| Dam and spillways | |
| Type of dam | Embankment, rock-fill |
| Impounds | Dadu River |
| Height | 312 metres (1,024 ft) |
| Height (foundation) | 314 metres (1,030 ft) |
| Length | 648.66 metres (2,128 ft) |
| Width (crest) | 16 metres (52 ft) |
| Dam volume | 44,000,000 cubic metres (1.553845336×109 cu ft) |
| Reservoir | |
| Creates | Shuangjiangkou Reservoir |
| Total capacity | 3,135,000,000 cubic metres (2,541,586 acre·ft) |
| Active capacity | 2,151,000,000 cubic metres (1,743,844 acre·ft) |
| Catchment area | 39,330 square kilometres (15,185 sq mi) |
| Normal elevation | 2,500 metres (8,202 ft) |
| Power station | |
| Commission date | 2018 (est.) |
| Type | Conventional |
| Hydraulic head | 226.4 metres (743 ft) (mean) |
| Turbines | 4 x 500 MW Francis-type |
| Installed capacity | 2,000 MW |
| Annual generation | 8,341 GWh |
The Shuangjiangkou Dam, also referred to as Shuang Jiang Kou, is an embankment dam currently being constructed on the Dadu River in Sichuan Province, China. When completed, the 312 metres (1,024 ft) tall dam will be the tallest dam in the world. Preliminary construction began in 2008 and the entire project is expected to be complete in 2018. By April 2011, over 200,000,000 m3 (261,590,124 cu yd) of material had been excavated from the construction site. In March 2013 the China's Ministry of Environmental Protection approved construction on the dam's superstructure and associated facilities. The government acknowledged that the dam would have negative impacts on the environment but that developers were working to mitigate them. The dam is being built by the Guodian Group at a cost of US$4.02 billion. The entire construction period is expected to last 10 years.
The Shuangjiangkou Dam, when completed, will be a 312-metre-high (1,024 ft) (314 metres (1,030 ft) from the foundation) and 648.66-metre-long (2,128 ft) rock-fill dam with a relatively impervious core. The dam's crest width will be 16 metres (52 ft), its elevation 2,420 metres (7,940 ft) above sea level. It will have a structural volume of approximately 44,000,000 cubic metres (1.553845336×109 cu ft). The dam will sit at the head of a 39,330-square-kilometre (15,185 sq mi) drainage basin and have a reservoir capacity of 3,135,000,000 cubic metres (2,541,586 acre·ft) of which 2,151,000,000 cubic metres (1,743,844 acre·ft) is regulating or active (useful) storage. Normal reservoir elevation will be 2,500 metres (8,202 ft) and minimum 2,420 metres (7,940 ft). Flood elevations range between 2,501 and 2,504 metres (8,205 and 8,215 ft). The dam's power station will contain four 500 MW Francis turbine-generators for an installed capacity of 2000 MW. Firm capacity of the power station is expected to be 503 MW along with the station operating for 4064 hours each year. The power station's design flow is 1,090 cubic metres per second (38,493 cu ft/s) and the mean hydraulic head 226.4 metres (743 ft).
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