Narakakkanam Weir (Malayalam:നാരകക്കാനം തടയണ) is a diversion dam constructed across Narakakkanam River in Mariyapuram panchayath of Thankamani Village in Idukki district in Kerala, India. Narakakkanam weir is an augmentation weir for the Idukki Hydro Electric Project . Narakakkanam, Azhutha, Vazhikkadavu, Vadakkepuzha and Kuttiar diversion schemes were later added to augment the Idukki reservoir . The height of the dam is from the deepest foundation and length is .
Specifications Location Latitude : 9⁰ 50′ N Longitude: 77⁰ 00′ E Panchayath : Mariyapuram Village: Thankamani District : Idukki River Basin : Periyar River : Narakakkanam river Release from Dam to river : Periyar Taluk through which release flows : Thodupuzha Year of completion : Name of Project : Idukki HEP Purpose of Project : Hydro Power Installed capacity of the Project 780 MW Type of Dam : Concrete- Gravity Classification; Weir Maximum Water Level (MWL) : EL 770.00 m Full Reservoir Level ( FRL): EL 768.00 m Storage at FRL 0.00396 Mm3 Height from deepest foundation : 11.50 m Length : 45.20 m Spillway : Ungated – Overflow section Crest Level : EL 768.00 m River Outlet : Not provided Officers in charge & phone No. Assistant Executive Engineer, Idukki Augmentation Scheme, Moolamattom. Phone-9496009429
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