A beautiful panoramic view of Idukki dam, reservoir and surrounding hills from Hill View Park and Calvary Mount. Magnificient view of massive 'IDUKKI ARCH DAM'. Breathtaking scenary of Idukki Wildlife Sanctuary and Western Ghats from Calvary Mount.

IDUKKI ARCH DAM

The Idukki Dam is a double curvature arch dam constructed across the Periyar River in a narrow gorge between two granite hills Kuravan and Kurathi in Kerala, India. At 167.68 metres, it is one of the highest arch dams in Asia. It was constructed and is owned by the Kerala State Electricity Board. It supports a 780 MW hydroelectric power station in Moolamattom, which started generating power on 4 October 1975.[1] Technically, the dam type is a concrete, double curvature parabolic, thin arc dam.[2]

This dam was constructed along with two other dams at Cheruthoni and Kulamavu. Together, the three dams have created an artificial lake that is 60 km² in area. The stored water is used to produce electricity at the Moolamattom Power house, which is located inside nearby rocky caves. The Government of Canada aided in the building of the dam with long term loans and grants.

Idukki Dam is 554 feet tall, constructed between the two mountains - Kuravanmala (839 meters) and Kuravathimala (925 meters ). This project is situated in Idukki District and its underground power house is located at Moolamattom which is about 43 km from the dam.

Twice in the past, the shutters (of Cheruthoni) had to be opened; during the northeast monsoon (October to December) on both occasions. The first time was in 1981 (when the shutters were repeatedly opened and shut between 29 October and 13 November) and the second time was in 1992 (when they were kept open for 12 days from 12 to 23 October). On both occasions, the water level in the dam touched the brim only when the storage built up during the southwest monsoon (June to September) was augmented by the inflow received immediately afterwards following heavy downpour early in the northeast monsoon.

CHERUTHONI DAM

The Cheruthoni Dam, located in Idukki District, Kerala, India, is a 138m tall concrete gravity dam. This dam was constructed as part of the Idukki Hydroelectric Project along with two other dams at Idukki and Kulamavu. The project was completed with Canadian aid. The Government of Canada aided the Project with long term loans and grants. S.N.C.Inc., Canada, a firm of Consulting Engineers were advising and assisting Project Engineers under the Canadian Aid.[1][2]

The water impounded by these three dams of Idukki, Cheruthoni & Kulamavu has formed a single reservoir spread over 60 km on a height of 2300 ft above Mean Sea Level.[3] The Idukki Dam is a double curvature arch dam constructed across Periyar River in a narrow gorge between two granite hills. Cheruthoni Dam is located 1 km west of Idukki dam. The spill way of the Idukki Reservoir is in the Cheruthony dam. Kulamavu Dam was constructed to prevent the water escape through a rivulet called Kalivally, 30 km west to Idukki Arch Dam. It is a 100 metres tall Masonry gravity dam. Construction of this Cheruthoni Dam, Idukki Arch Dam and Kulamavu Dam created an artificial lake of 60 km2 and the water stored, is used for production of electricity at the Moolamattom Power house. The power house at Moolamattom is the biggest underground power station in India and the pressure shaft is the largest in the country. Cheruthony is the largest and highest gravity dam in Kerala.[4] Storage of water in Idukki Reservoir started in February, 1973. Moolamattom Power Station was Commissioned in February 1976 by Prime Minister Indira Gandhi.

KULAMAVU DAM

Kulamavu Dam (Malayalam: കുളമാവ് അണകെട്ട്) is a gravity/masonry dam on the Periyar river. It is one of the three dams associated with the Idukki hydro electric power project in the Indian state of Kerala.[1] The dam is situated on the Thodupuzha - Puliyanmala state highway (SH-33), about 23 km (14 mi) from Idukki arch dam, 22 km (14 mi) from Cheruthoni dam and 38 km (24 mi) from Thodupuzha.

The dams of Idukki, Cheruthoni and Kulamavu extend to an area of 33km². The construction of these three dams formed a 60km² artificial lake.

MOOLAMATTOM POWER STATION

Moolamattom Power Station the biggest underground Hydro-electric Project in India.[1] The water from the Idukki Dam is carried by the underground pipes to the power station. The installed capacity of the Power House is 780MW consisting of 6 generator units of 130 MW each.The regulated waters of Periyar falls through a drop of about 669.2 metres (2195 feet)

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