|Official name||Chirkeisk GES|
|Dam and spillways|
|Type of dam||Arch|
|Height||232.5 m (763 ft)|
|Length||338 m (1,109 ft)|
|Width (crest)||6 m (20 ft)|
|Width (base)||30 m (98 ft)|
|Dam volume||1,275,000 m3 (45,026,200 cu ft)|
|Spillway type||Service, flood discharge tunnel|
|Spillway capacity||2,900 m3/s (102,413 cu ft/s)|
|Total capacity||2,780,000,000 m3 (2,253,783 acre·ft)|
|Catchment area||11,290 km2 (4,359 sq mi)|
|Surface area||42.4 km2 (16 sq mi)|
|Max. water depth||200 m (656 ft)|
|Hydraulic head||205 m (673 ft) (max.)|
|Turbines||4 x 250 MW Francis-type|
|Installed capacity||1,000 MW|
|Annual generation||2.47 billion kWh|
The Chirkey Dam (Chirkeisk GES) is an arch dam on the Sulak River in Dagestan, Russia. The main purpose of the dam is hydroelectric power production and it supports a 1,000 MW power station. Construction on the dam began in 1964, the first generator was operational by 1974, the last in 1976 while the project was complete in 1978. It is the tallest arch dam in Russia.
The dam is a 232.5 m (763 ft) tall and 338 m (1,109 ft) long (crest) concrete arch dam. It is 6 m (20 ft) wide at its crest, 30 m (98 ft) wide at its base and contains 1,275,000 m3 (45,026,200 cu ft) of concrete. The dam withholds a 2,780,000,000 m3 (2,253,783 acre·ft) reservoir of which 1,320,000,000 m3 (1,070,141 acre·ft) is active or "useful" storage. The reservoir has a surface are of 42.4 km2 (16 sq mi), length of 40 km (25 mi) and maximum width of 5 km (3 mi). Maximum depth of the reservoir is 200 m (656 ft) and its catchment area is 11,290 km2 (4,359 sq mi).
The dam's spillway consists of a 509 m (1,670 ft) long non-pressure tunnel with its intake on the left bank of the dam. The spillway's capacity is 2,900 m3/s (102,413 cu ft/s). The dam's outlet works, spillway and power station have a combined discharge capacity of 3,550 m3/s (125,367 cu ft/s).
The dam's power station contains 4 x 250 MW Francis turbine-generators for a total installed capacity of 1,000 MW. Each generator is supplied with water by a penstock, all four of which intake on the upstream side of the dam's face and run down the its surface toward the power station at the dam's base.
- Photos of the dam at EnglishRussia.com