Latyan Dam
| latyan Dam | |
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 Location of latyan Dam in Iran
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| Official name | سد لتیان |
| Location | Lavasan, Tehran Province, Iran |
| Coordinates | 35°47′24.25″N 51°40′42.63″E / 35.7900694°N 51.6785083°ECoordinates: 35°47′24.25″N 51°40′42.63″E / 35.7900694°N 51.6785083°E |
| Purpose | Water supply, power |
| Construction began | 1963 |
| Opening date | 1967 |
| Dam and spillways | |
| Impounds | Jajrood River |
| Height | 107 m (351 ft) |
| Length | 450 m (1,480 ft) |
| Width (base) | 99 m (325 ft) |
| Reservoir | |
| Total capacity | 95,000,000 m3 (77,000 acre·ft) |
| Power station | |
| Commission date | 1969/1987 |
| Type | Conventional |
| Turbines | 2 x 22.5 MW |
| Installed capacity | 45 MW |
Latyan Dam (Persian: سد لتيان, also Romanized as Sadd-e Latyān) is a buttress dam on the Jajrood River, located less than 25 km from Tehran in the south of city of Lavasan. It is one of the main sources of water for Tehran metropolitan region. It was constructed between 1963 and 1967. The first generator in the dam's 45 MW hydroelectric power station was commissioned on 17 March 1969, the second on 13 April 1987.
Jajrood River basin is located in the southern part of central Alborz mountain range, the rocks of which date from the Palaeozoic era up to the Quaternary period, as below:
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