Perunthenaruvi Weir

Perunthenaruvi Weir is a diversion dam built across Pamba river at villages of Naranammoozhy and Vechoochira in Pathanamthitta District of Kerala, India. Perumthenaruvi Small Hydroelectric Project 6 MW (2×3) is a run-of-the-river scheme in river Pamba, and the weir is a part of this scheme. This envisages the utilization of water from 442 km2 catchment of Pamba and Azhutha river for electricity generation under a net head of 18.00 m. The power house is located on the left bank of Pamba river. The weir is a concrete gravity type with a height of 10.93 m and a length of 227.50 m. Taluks through which the release flow are Ranni, Konni, Kozhencherry, Thiruvalla, Chengannur, Kuttanadu, Mavelikara and Karthikappally.

Specifications

 * Latitude : 9⁰ 24′ 44 ” N
 * Longitude: 76⁰ 52′ 48” E
 * Panchayath : Ranni- Perinad
 * Village : Naranammoozhi & Vechoochira
 * District : Pathanamthitta
 * River Basin : Pamba
 * River: Pamba
 * Release from Dam to river : Pamba
 * Type of Dam : Concrete – Gravity
 * Classification : Weir
 * Maximum Water Level (MWL) : EL 55.20 m
 * Full Reservoir Level ( FRL) : EL 51.0 m
 * Storage at FRL : 1.00 Mm3
 * Height from deepest foundation : 10.93 m
 * Length : 227.50 m
 * Spillway : Ungated- Overflow section
 * Year of completion : 2017
 * Crest LevelEL : 51.00 m
 * Name of Project : Perunthenaruvi SHEP
 * River Outlet : 2 Nos. 2.00x 4.00m

Hydrology

 * Catchment area - 442 km2
 * Average Annual Yield - 1093 Mm3
 * Peak flood at the diversion weir - 395Cumecs

Tourism
The Poonthenaruvi Water falls and related Eco tourism project is near the weir site. There is hanging bridge and view towers to spectate the beauty of the ravine.