Idukki Dam
The Idukki Dam, located in Kerala, India, is currently the largest arch dam in Asia, at 555 feet in height. The dam stands between the two mountains - Kuravanmala (839 feet) and Kurathimala (925 feet).It was constructed and owned by the Kerala State Electricity Board

Geography
It is situated in Idukki District and its underground Power House is located at Moolamattom which is about 19 km from Thodupuzha. Idukki Dam is 43 km away from Moolamattom. The Idukki Dam is built on the Periyar River, in the ravine between the Kuravan and Kurathi Hills in Kerala, India. At 167.68 meters, it is one of the highest arch dams in Asia. It started generating power on 4 October 1975. Technically, the dam type is a concrete double, curvature parabolic, thin arc dam.

History
The possibility of Hydroelecric development at Idukki was first conceived in 1919. As per history Shri Kolumban, the head of 'Araya' race during 1922 showed the way, to the Malankara Estate Superintendent and his friend Thomas MJ, who were on hunting spree in the forest, the spot of present Arch Dam. He told them of the legend of Kuravan and Kurathi Hills. Sri. W.J.John of Malankara Estate submitted a report to the Government of Travancore in 1932 on the possibility of constructing a dam at Idukki for Power Generation. The gorge between two granite hills across which the Idukki arch dam is constructed. In 1947 Sri.P.Joseph John,then Chief Electrical Engineer to the Government of Travancore made a preliminary investigation report. On the request made by the Government, the Central Water and Power Commission took up detailed investigation in 1956. The project report was prepared in 1961 and the Planning Commission accorded sanction for implementing the scheme in 1963 and the preliminary works of the project were started. The dam was constructed along with two other dams at Cheruthony and Kulamavu. Together, the three dams have created an artificial lake that is 60 km² wide. The stored water is used to produce electricity at the Moolamattom Power house, which is located inside caverns nearby. The Government of Canada aided in the building of the dam with long term loans and grants.

Power Production
The Project harnesses a major portion of the power potential of Periyar, the largest river in Kerala State, by the creation of a reservoir of 2,000 M.cum (2 Billion Tonnes) capacity, diversion of waters thus impounded through a water conductor system consisting of a power tunnel and two underground pressure shafts to an underground power house situated in Muvattupuzha Valley. The installed capacity of the Power House is 780MW consisting of 6 Units of 130 MW each.The regulated waters of Periyar falls through a drop of about 669.2 metres (2195 feet) while generating power in the underground power house. The tail waters flowing to Kudayathurpuzha through tunnel and open channel will later be diverted for irrigation purposes in the Muvattupuzha Valley.

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