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Tehri dam
INTRODUCTION
• The Tehri Dam is the highest dam in India and one of the highest in the
world.
• Location : On the Bhagirathi River. 200 miles north east of Delhi.
• Height : 855 feet (261 m) 5th tallest dam in the world.
• Capacity : power generation capacity of 2400 MW provision of irrigation
to an area of 270,000 hectares.
• The Tehri Dam withholds a reservoir for irrigation, municipal water
supply and the generation of 1,000 megawatts of hydroelectricity.
• Tehri Development Project approved in 1972
• Construction started 1978
• Cofferdam completed 1996
• Closure of last two tunnels December 2002
• Projected completion August 2003
Benefits to Nation / Region
• 2400MW of environment friendly Peaking power.
• Irrigation of 2.7 lakh hactors Of new area.
• 162 million gallons per day of water supply to Delhi.
• All round development of the region through better infrastructure and
easy avalaibility of electricity.
• Development of pisciculture.
Concerned issues
Negative Impacts
Change in the
• Water chemistry, especially with respect to dissolved oxygen and
• Turbidity of water.
Seismic Risks
• Worlds most earthquake prone regions.
• Designed for 7.2 ; expected: 8.5 or more.
Floods
• If the dam fails or a major landslide causes a huge wave to overtop the
reservoir, a 260 m high flood wave would crash down into the densely
populated valleys below the dam.
Protests
• 1978 – Tehri Bandh Virodhi Sangharsh Samiti (TBVSS).
• 74-day hunger strike in 1996 by Sunderlal Bahuguna.
• Many Anti-dam rallies and protest.
Environmental issues
• Protests was against displacement of town inhabitants and consequence of
week ecosystem.
• The Tehri dam is located in the Central Himalayan Seismic Gap. This region
was the site of a 6.8 magnitude earthquake in October 1991, with an
epicenter 53 km from the location of the dam.
• 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.
• If it breaks down, numerous towns downstream would submerge whose
population is near one million.
Measures for Ecological Impacts
• Compensatory Afforestation : afforestation in an area of 4586.07 ha.
• Catchment area treatment : To reduce soil erosion and 52.204 ha. treated.
• Command area development : To mitigate water logging and sanity and the
network of field and drains were developed.
• Flora and Fauna : Botanical garden (14.28ha.) to preserve important flora
and Mahseer fish hatchery and fish farm.
Measures for Ecological Impacts
• Water quality maintenance : No adverse effect on the water quality and 5
monitoring stations at upstream and downstream.
• Green belt : Along the rim of the reservoir
• Along the rim of the reservoir and resultant siltation to protect and
regenerate the vegetation to increase the natural beauty

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Tehri Dam

  • 2. INTRODUCTION • The Tehri Dam is the highest dam in India and one of the highest in the world. • Location : On the Bhagirathi River. 200 miles north east of Delhi. • Height : 855 feet (261 m) 5th tallest dam in the world. • Capacity : power generation capacity of 2400 MW provision of irrigation to an area of 270,000 hectares.
  • 3. • The Tehri Dam withholds a reservoir for irrigation, municipal water supply and the generation of 1,000 megawatts of hydroelectricity. • Tehri Development Project approved in 1972 • Construction started 1978 • Cofferdam completed 1996 • Closure of last two tunnels December 2002 • Projected completion August 2003
  • 4. Benefits to Nation / Region • 2400MW of environment friendly Peaking power. • Irrigation of 2.7 lakh hactors Of new area. • 162 million gallons per day of water supply to Delhi. • All round development of the region through better infrastructure and easy avalaibility of electricity. • Development of pisciculture.
  • 5. Concerned issues Negative Impacts Change in the • Water chemistry, especially with respect to dissolved oxygen and • Turbidity of water. Seismic Risks • Worlds most earthquake prone regions. • Designed for 7.2 ; expected: 8.5 or more.
  • 6. Floods • If the dam fails or a major landslide causes a huge wave to overtop the reservoir, a 260 m high flood wave would crash down into the densely populated valleys below the dam. Protests • 1978 – Tehri Bandh Virodhi Sangharsh Samiti (TBVSS). • 74-day hunger strike in 1996 by Sunderlal Bahuguna. • Many Anti-dam rallies and protest.
  • 7. Environmental issues • Protests was against displacement of town inhabitants and consequence of week ecosystem. • The Tehri dam is located in the Central Himalayan Seismic Gap. This region was the site of a 6.8 magnitude earthquake in October 1991, with an epicenter 53 km from the location of the dam. • 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. • If it breaks down, numerous towns downstream would submerge whose population is near one million.
  • 8. Measures for Ecological Impacts • Compensatory Afforestation : afforestation in an area of 4586.07 ha. • Catchment area treatment : To reduce soil erosion and 52.204 ha. treated. • Command area development : To mitigate water logging and sanity and the network of field and drains were developed. • Flora and Fauna : Botanical garden (14.28ha.) to preserve important flora and Mahseer fish hatchery and fish farm.
  • 9. Measures for Ecological Impacts • Water quality maintenance : No adverse effect on the water quality and 5 monitoring stations at upstream and downstream. • Green belt : Along the rim of the reservoir • Along the rim of the reservoir and resultant siltation to protect and regenerate the vegetation to increase the natural beauty