Idamalayar Dam
Idamalayar Dam is a multipurpose concrete gravity dam located at Ennakkal between Ayyampuzha and Bhoothathankettu in Ernakulam district of Kerala on the Idamalayar, a tributary of the Periyar River in Kerala, South India. The dam however extends east as far as Malakkappara. Completed in 1985, with a length of 373 metres (1,224 ft) and a height of 102.8 metres (337 ft), the dam created a multipurpose reservoir covering 28.3 km2 (10.9 sq mi) in the scenic hills of the Anamalais.
| Idamalayar Dam | |
|---|---|
Idamalayar Dam | |
Location of Idamalayar Dam in India Idamalayar Dam (Kerala) | |
| Official name | Idamalayar Dam |
| Country | India |
| Location | Ernakulam District, Kerala |
| Coordinates | 10°12′53.0″N 76°52′37.4″E10°12'53.0"N 76°52'37.4"E |
| Construction began | 1970 |
| Opening date | 1985 |
| Construction cost | Rs. 539.50 crores (US$1.199 billion) |
| Owner(s) | Kerala State Electricity Board |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Edamalayar/Periyar river |
| Height | 102.80 metres (337.3 ft) |
| Length | 373 metres (1,224 ft) |
| Reservoir | |
| Creates | Idamalayar Reservoir |
| Total capacity | 1.0898 cubic kilometres (0.2615 cu mi) |
| Catchment area | 381 km2 (147 sq mi) |
| Surface area | 28.3 km2 (10.9 sq mi) |
| Operator(s) | Kerala State Electricity Board |
| Turbines | 2 x 37.5 MW |
| Installed capacity | 75 MW |
| Annual generation | 380 GW·h |
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 large reservoir created by the Idamalayar Dam is operated by the Kerala State Electricity Board to augment its peak power generation requirements. The dam will benefit the Idamalayar Irrigation Development Project by diverting water released from the tail race channel of the Idamalayar power station.