The Tehri Dam

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Jaypee University of Engineering and Technology Guna (M.P.)

A Project Report On
Tehri Dam

Submitted To: Submitted By: Mr. Krishna Murari Rachit Khandelwal Senior Lecturer Er No.-091558 Department Of Civil Engineering Civil (D2)

Tehri Dam

Introduction
The Tehri Dam is a multi-purpose rock and earth-fill embankment dam on the Bhagirathi River near Tehri in Uttarakhand, India. It is the primary dam of the Tehri Hydro Development Corporation Ltd. and the Tehri hydroelectric complex.

Tehri Dam Project is one of the important storage cum hydro energy generation complex is in the Himalayan region of the country. After Bhakara it is the biggest water storage dam and may provide benefits to the water starved areas of Western U.P., Uttaranchal and Delhi. The hydro- energy may add to the peaking capacity of the Northern Grid and may help in stabilizing it.

History
A preliminary investigation for the Tehri Dam Project was completed in 1961 and its design was completed in 1972 with a 600 MW capacity power plant based on the study. Construction began in 1978 after feasibility studies but was delayed due to financial, environmental and social impacts. In 1986, technical and financial assistance was provided by the USSR but this was interrupted years later with political instability. India was forced to take control of the project and at first it was placed under the direction of the Irrigation Department of Uttar Pradesh. However, in 1988 the Tehri Hydro Development Corporation was formed to manage the dam and 75% of the funding would be provide by the federal government, 25% by the state. Uttar Pradesh would finance the entire irrigation portion of the project. In 1990, the project was reconsidered and the design changed to its current multi-purpose. Construction of the Tehri Dam was complete in 2006.

Location

Tehri Dam is the primary dam of the Tehri Development Project, a major hydroelectric project centered near Tehri Town in the state of Uttarakhand in India.It is located on the Bhagirathi River, the principal tributary of the sacred River Ganga

Technical description

1. Earth & Rock Fill Dam :
Type : Rock and Earth Fill Height : 260.5 m
Base : 1128 m Width at top : 25.5 m
Length at the top : 592 m

2. Tehri Reservoir:
Water Spread : 42 SQ KM Gross Storage : 3540 Miliion Cum
Live Storage : 2615 Million Cum

3. Power House:
Power House : Under ground Cavern
Size : 197mx24mx63m
Type of Turbines : Francis
Rated Head : 188 M Speed : 214.3 RPM
Installed Capacity : 4x250MW
Annual Energy : 3568 MUs

Time Line for Tehri Dam

1949 Tehri dam conceived
1961 Tehri chosen as a tentative site for the dam
1972 Planning Commission gives its nod to the dam
1978 Actual construction of the dam begins under police protection; Protests gather momentum 1980 Environmental Appraisal Committee appointed by the government, refuses environmental clearance 1986 Diversion tunnels start operating; Protestors storm the site and stall construction work 1990 Environmental Appraisal Committee, the D R Bhumbla committee, rejects the dam again 1991 Earthquake measuring 6.6 on Richter scale rocks Uttarkashi. Renewed concerns about the seismic safety of the dam. 1992 Sunderlal Bahuguna goes on a fast unto death. Work on the dam temporarily stopped. Gain in 1995 1996 Government sets up the V K Gaur committee to look into seismic safety 1997 Hanumantha Rao committee on rehabilitation submits its report. Recommends major changes in rehabilitation policy 1998 Gaur committee submits its report. Asks for detailed analysis 1999 Chamoli earthquake, measuring 6.8, brings large scale destruction....
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