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 km (171 sq mi) 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 metres (35.9 ft) and a length of 227.50 metres (746.4 ft). Taluks through which the release flow are Ranni, Konni, Kozhencherry, Thiruvalla, Chengannur, Kuttanadu, Mavelikara and Karthikappally.

• 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

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

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.