The Srisailam Dam is a dam constructed across the Krishna River at Srisailam in the Kurnool district in the state of Andhra Pradesh in India and is the 3rd largest capacity hydroelectric project in the country.
| Srisailam Dam | |
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The dam was constructed in a deep gorge in the Nallamala Hills, 300 m (980 ft) above sea level. It is 512 m (1,680 ft) long, 145 m (476 ft) high and has 12 radial crest gates. It has a reservoir of 800 km2 (310 sq mi). The left bank power station houses 6 × 150 MW reversible Francis-pump turbines (for pumped-storage) and the right bank contains 7 × 110 MW Francis-turbine generators.
Project history
The Srisailam project began in 1960, initially as a power project, across the Krishna, near Srisailam in Andhra Pradesh. After several delays, the main dam was finally completed twenty years later in 1981. In the meantime the project was converted into a multipurpose facility with a generating capacity of 770 MW by its second stage which was expected to be completed in 1987. The dam is to provide water for an estimated 2,000 km2 (770 sq mi) with its catchment area of 206,040 km2 (79,552 sq mi) and water spread of 1,595 km2 (616 sq mi). Under the right branch canal 790 km2 (310 sq mi) in Kurnool and Kaddapa districts will have assured irrigation. From the initial modest estimate of Rs.384.7 million for a power project the total cost of the multipurpose project was estimated to cross Rs.10 billion in its enlarged form. The 143 m (469 ft) high and 512 m (1,680 ft) wide dam has alone cost Rs.4.04 billion together with the installation of four generating sets of 110 MW each. The right branch canal is estimated to cost Rs.4.49 billion and the initial investment of Rs.1.4 billion has been provided by the World Bank. The projected cost-benefit ratio of the project has been worked out at 1:1.91 at 10% interest on capital outlay.[citation needed]. On 2 October 2009, Srisailam dam experienced a record inflow which threatened the dam.[3]
Power generation optimization
At present the initial inflows in to Srisailam reservoir are stored excessively without using for power generation. The flood water fills the remaining empty Srisailam reservoir quickly and most of the flood water overflows in to downstream Nagarjunasagar reservoir without being used for power generation.[4] The endeavor shall be to fill the Nagarjunasagar reservoir fully with the uniform water released through the power generating units.
See also
External links
References
- ^ "India: National Register of Large Dams 2009" (PDF). Central Water Commission. Retrieved 10 July 2011.
- ^ Jauhari, V.P. (2005). Sustaining river linking. New Delhi, India: Mittal Publications. p. 84. ISBN 817099991X.
- ^ Managing historic flood in the Krishna river basin in the year 2009
- ^ Optimisation of power generation from Srisailam Hydroelectric Power Station