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 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 and a length of . 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.
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