| Erattayar Dam | |
|---|---|
 Erattayar Dam | |
  Location of Erattayar Dam in Kerala | |
| Country | India |
| Location | Erattayar |
| Coordinates | 9°48′37″N77°06′22″E / 9.8103°N 77.1060°E /9.8103; 77.1060 |
| Purpose | Power |
| Status | Operational |
| Opening date | 1975 (1975) |
| Owner(s) | Kerala State Electricity Board |
| Dam and spillways | |
| Type of dam | Gravity dam |
| Impounds | Perinjamkutty river |
| Height (foundation) | 19.81 m (65.0 ft) |
| Length | 146.3 m (480 ft) |
| Spillways | 2 |
| Spillway type | Ogee type – 2 Nos. Radial gates, each of size 7.62 x 6.10 m |
| Website [1] | |
Erattayar Dam (Malayalam: ഇരട്ടയാർ അണക്കെട്ട്) is a small, diversion dam built on the Erattayar river inErattayar gramapanchayat nearKattappana town inIdukki district ofKerala,India.[1] It acts mainly as a diversion dam to supply water to theIdukki dam. Diversion of water from Erattayar forebay to Idukki reservoir is through a tunnel calledAnchuruli tunnel[2] which is 3.77 km (2.34 mi) long.[3] Construction of the dam was completed in the year 1989.
It is a small dam measuring only 46.3 m in length and 19.81 m in height. Idukki HE Project- Stage III- Kallar-Erattayar diversion scheme envisages creation of two forebays by means of diversion dams, one in river Kallar of storage capacity 28 Mcft.( 0.793 MCM) and another in river Erattayar of storage capacity 189 Mcft (5.352 MCM) in the upper reaches of river Perinjamkutty a tributary of Periyar. Water from Kallar is diverted to Erattayar through a tunnel 2735.58 m long.[4] Taluk through which release flows areThodupuzha,Udumpanchola,Devikulam,Kothamangalam,Muvattupuzha,Kunnathunadu,Aluva,Kodungalloor andParavur.
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