dams were built on the rivers of the province, the most important of which include Amir Kabir Dam, Lar Dam and Latiyan Dam. Amir Kabir Dam (or Karaj Dam), a multi-functional dam, was built in 1961 in the northwest of Tehran on Karaj-Chalood road. The watershed area of the dam is 764 sq km, with an average annual water of 472 million cubic meters. The dam was built to control spring torrents, to prevent damage from floods, to supply Tehran’s drinking water by 340 million cubic meters per year, to keep water for farming on the lands surrounding Karaj by 130 million cubic meters per year and to generate energy to help the nationwide electricity network, especially during peak hours, by providing 150 000 megawatt per hour per year. Latiyan Dam was built in the northeast of Tehran, 5 kilometers off Jajrood. The watershed area area of the dam is 69800 sq km, with an average annual water of 350 million cubic meters. The Kalan power house was built at Kalan region, 20 kilometers off the dam. The dam was made to supply Tehran’s drinking water by 290 million cubic meters per year, and to supply 160 million cubic meters per year for agricultural purposes at Varamin plain.

    
From 1989, 140 million cubic meters of Lar water is transferred along a 20-km route to Kalan power house and then to Latiyan dam. As a result, the water of Latiyan has increased by 410 million cubic meters. As another supplier of drinking water of Tehran, Lar Dam was built in 1982 on the river Lar, in Mazandaran province, with a watershed area of 675 sq km, and an average annual water of 481 million cubic meters.
Rivers and dams of Tehran Province (2006)

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