The Tehri Dam of Uttarakhand is the highest dam in India, 2nd highest in Asia and 8th highest in World. It is on the Bhagirathi River near Tehri Garhwal in Uttarakhand, India.
Tehri dam is being built by THDC India Ltd. The dam is expected to generate about 2400 megawatts of electricity. The total cost associated with the Tehri Dam project is around Rs 8000/- crores.
Tehri dam is about 260.5 metres (855 ft) high rock and earth-fill embankment dam. Its length is 575 metres (1,886 ft), crest width 20 metres (66 ft), and base width 1,128 metres (3,701 ft). The dam creates a reservoir of 2.6 cubic kilometres (2,100,000 acre sq ft) with a surface area of 52 square kilometres (20 sq mt).
The installed hydro capacity is 1,000 MW along with an additional 1,000 MW of pumped storage hydroelectricity. The Tehri Dam and the Tehri Pumped Storage Hydroelectric Power Plant are part of the Tehri Dam Hydro power Complex which also includes the 400 MW Koteshwar Dam .
The Scheduling and Despatch of the Tehri Dam Hydro Power plant is done by Northern Regional Load Despatch Centre which is the apex body to ensure the integrated operation of the power system grid in the Northern region and comes under Power System Operation Corporation Limited (POSOCO). At present, THDC India Ltd. is generating around 3000 million Unit of energy annually from this dam.
The Tehri Dam project has brought concerns about the environmental problems of locating a large dam in the delicate ecosystem of the Himalayan foothills.
There are growing concerns regarding the dam's stability. Tehri dam is located 7.5kms above the Central Himalayan Seismic Gap, which is a major geologic fault zone. This region was the site of a 6.8 magnitude earthquake in October 1991, with an epicentre 5 km from the location of the dam. Building of the dam will put further pressure on the seismic gap and thus increases the chances of an earthquake.
The Tehri dam is designed to withstand an earthquake of 8.4 magnitude, but some seismologists say that earthquakes with a magnitude of 8.5 or more could occur in this region.
This could result in a dam-break and the flood waters from the dam could submerge numerous towns comming in the way. Tehri dam has been in active protest by environmental organizations and local people of the region.
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New Tehri has an average temperature of 15°CC - 16°CC during the summers and around 5°CC - 6°CC during the winter months of September - October - November. It also receives occasional snowfall during January and February.
Tehri Dam can be visited all year around.
Reference Tehri Dam on Wikipages