Longyangxia Dam

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Longyangxia Dam
Longyangxia Dam is located in China
Longyangxia Dam
Location of Longyangxia Dam
Country China
Location Gonghe County, Qinghai Province
Coordinates 36°07′20″N 100°55′06″E / 36.12222°N 100.91833°E / 36.12222; 100.91833Coordinates: 36°07′20″N 100°55′06″E / 36.12222°N 100.91833°E / 36.12222; 100.91833
Status In use
Construction began 1976
Opening date 1992
Dam and spillways
Type of dam Arch gravity dam
Impounds Yellow River
Height 178 metres (584 ft)
Length 396 metres (1,299 ft)
Width (crest) 18.5 metres (61 ft)
Width (base) 80 metres (262 ft)
Spillway type Service, gate-controlled on crest
Creates Longyangxia Reservoir
Total capacity 24.7 billion cubic metres (20,000,000 acre·ft)
Catchment area 752,443 square kilometres (290,520 sq mi)
Surface area 383 square kilometres (148 sq mi)
Power station
Hydraulic head 122 metres (400 ft) (design)
Turbines 4 x 320 MW
Installed capacity 1,280 MW
1,400 MW (max. planned)
Annual generation 6 TWh

The Longyangxia Dam is a concrete arch-gravity dam at the entrance of the Longyangxia canyon on the Yellow River in Gonghe County, Qinghai Province, China. The dam is 178 metres (584 ft) tall and was built for the purposes of hydroelectric power generation, irrigation, ice control and flood control. The dam supports a 1,280 MW power station with 4 x 320 MW generators that can operate at a maximum capacity of 1400 MW. Controlling ice, the dam controls downstream releases to reservoirs lower in the river, allowing them to generate more power instead of mitigating ice. Water in the dam's 24.7 billion m3 reservoir provides irrigation water for up to 1,000,000 hectares (2,471,054 acres) of land.[1]

The dam is composed of its main body and a gravity pier and secondary dam on both its left and right flank. The dam's service spillway contains two 12 metres (39 ft) wide gates that discharge water into two 260 metres (853 ft) and 280 metres (919 ft) long chutes. Downstream discharges are also controlled by a similar single-chute middle outlet and the lower outlet works.[1]

See also[edit]


  1. ^ a b "Longyangxia Hydropower Project" (PDF). Chinese National Committee on Large Dams. Retrieved 7 January 2011.