Description
The Rana Pratap Sagar Dam is a straight masonry gravity structure of 53.8 m (177 ft) height with a length of 1,143 m (3,750 ft). The reservoir stretch is -km and its surface area at the Full Reservoir Level is 198.29 km2 (76.56 sq mi). The dam has created a storage capacity (Gross Storage) of 2,898,000,000 cubic metres out of which the utilizable storage (Live Storage) is 1,566,520,000 cubic metres. The dam is designed to pass a designed flood discharge of 18,408.00 m3/s through a spillway structure which is provided with 17 crest gates of 18.3 mx8.53m size above the spillway crest for the purpose. In addition, sluice gates have also been provided in the body of the dam at lower levels to remove silt deposited in the dam.
The power house is located on the left side of the spillway and consists of 4 units of 43 MW each, with firm power generation of 90 MW at 60% load factor. The stored water from the reservoir including the water discharged from the powerhouse of the upper reservoir (The Gandhi Sagar Reservoir) is utilized for power generation over an operating head range of 189 ft (58 m) (maximum) to 152 ft (46 m) (minimum). The water conductor system consists of penstock pipes (of 20 ft (6.1 m) diameter) from the dam to feed the four power plants (turbo-generators) and a tailrace tunnel of 1,450 m (4,760 ft) length and diameter 12 m (39 ft), to lead the water back to the Chambal River. Rajasthan State has a 50% share in the power generation of this station.
The project was built at a cost of Rs4065 million including the Power plant which involved a cost of Rs1474 million. Funds were provided under the Colombo Plan to import the equipment from Canada. At a formal inauguration held on 9 February 1970, the project was dedicated to the nation. The power plant was transferred to the Rajasthan State Electricity Board now renamed as Rajasthan Rajya Vidyut Utpadan Nigam Limited. According to energy generation statistics reported for the period 1968–2008, the average generation was 480.6 GWh against originally planned generation of 473 GWh. Along with the Rajasthan Atomic Power Station which is located near the Rawatbhata dam and the Rana Pratap Sagar Power plant contribute to the stability of the Northern Regional Power Grid of the country.
- Reservoir
The reservoir water stretch from the dam extends up to the Gandhi Sagar Dam. The Rana Pratap Sagar Reservoir, the wetland created by the dam, is identified as one of the important aquatic areas with suitable vegetation for bird life proliferation, which needs enumeration for its bird species. The reservoir area supports considerable population of resident and migratory birds.
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