Tehri dam
Tehri Dam is the primary dam of the Tehri Hydro Development Corporation Ltd., and the Tehri hydroelectric complex centered near Tehri Town in the state of Uttarakhand in India. Located on the Bhagirathi River, the principal tributary of the sacred River Ganges, the embankment dam has a height of 855 feet (261 m), making it the 8th tallest dam in the world. Completed in 2006, the Tehri Dam withholds a reservoir of 2.6 billion cubic meters for irrigation, municipal water supply and the generation of 1000 MW of hydroelectricity along with an additional 1000 MW of pumped storage hydroelectricity.

The 1000 MW Tehri Dam is part of the Tehri Hydropower Complex which also includes the 400 MW Koteshwar Dam downstream and the 1000 MW Tehri Pumped Storage Hydroelectric Power Plant which is set for completion in 2013. The Tehri dam along with the downstream Koteshwar Dam and the Tehri pumped storage hydroelectricity power plant will afford a power generation capacity of 2400 MW, provision of irrigation to an area of 270,000 hectares, irrigation stabilization to an area of 600,000 hectares, and a supply of 270 million gallons of drinking water per day to the industrialized areas of Delhi, Uttar Pradesh and Uttarakhand.

Issues raised by Environmental organizations
The Tehri Dam has been the object of active protestation by environmental organizations and local people of the region. In addition to the human rights concerns, the project has spurred concerns about the environmental consequences of locating a large dam in the fragile ecosystem of the Himalayan foothills. There are further concerns regarding the dam's geological stability. The Tehri dam is located in the Central Himalayan Seismic Gap, a major geologic fault zone. This region was the site of a 6.8 magnitude earthquake in October 1991, with an epicenter 500 km from the location of the dam. Dam proponents claim that the complex is designed to withstand an earthquake of 7.2 magnitude, but some seismologists say that earthquakes with a magnitude of 8.5 or more could occur in this region. Were such a catastrophe to occur, the potentially resulting dam-break would submerge numerous towns downstream, whose populations total near half a million. The relocation of more than 100,000 people from the area has led to protracted legal battles over resettlement rights, and ultimately resulted in the project's delayed completion. Since 2005, filling of the reservoir has led to a reduced flow of Bhagirathi water from the normal 1000 ft³/s to a mere 2 ft³/s. This reduction has been central to local protest against the dam, since the Bhagirathi is considered part of the sacred Ganges whose waters are crucial to Hindu mythology. At some points during the year, the tampering with Bhagirathi waters means this tributary stops flowing. This has created resentment among many Hindus, as the sanctity of the Ganges has been greatly compromised for the generation of electricity. In spite of concerns and protestation, operation of the Tehri Dam continues, and the complex generated its first unit of electricity in June 2006.

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