Idamalayar Dam

Idamalayar Dam
Photo Credit : Wikimedia

The Idamalayar Dam is located at Ennakal It’s a multipurpose concrete gravity dam, near Bhoothathankettu, on the Idamalayar River, a tributary of the Periyar River in Kerala, South India. Completed in 1985, with a length of 373 metres (1,224 ft), the dam created a multipurpose reservoir covering 28.3 km2 (10.9 sq mi) in the scenic hills of the Western Ghats. The reservoir storage is utilized by a hydroelectric power station which has an installed capacity of 75  MW with two units of 37.5 MW capacity, producing an annual energy output of  380 GW·h. The dam will benefit the Idamalayar Irrigation Development Project by diverting water released from the tail race channel of the Idamalayar power station. The large reservoir created by the Idamalayar Dam is operated by the  Kerala State Electricity Board to augment its peak power generation requirements.

Based on detailed hydrological analysis, with observed data supplemented by rainfall-runoff correlation and prediction of low flows during dry months, the mean annual runoff was estimated as about 1,207 million cubic meters (million cubic metres) and that at 95% availability as 730 million cubic metres. Therefore, the live storage in thereservoir was fixed at 1,032.3 million cubic metres. However, subsequent to the commissioning of the project in 1987, availability of the flows was reassessed. It was noted that flows reduced to 1,178 million cubic metres in dry season and reached 4,361 million cubic  metres during the monsoon. Eatables and drinking water have to be stored well in advance. Be warned that there are not many shops in the route from Vadaattupara to Idamalayar. On prior information, food will be arranged at the Idamalayar KSEB canteen. However, larger groups should inform the canteen inmates about the number of people for whom food should be prepared. KSEB inspection bungalows, which have eight rooms in total,provide accommodation to tourists for one night. Rent per day is Rs. 300.


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