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. ^[1] 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 11.50 metres (37.7 ft) from the deepest foundation and length is 45.20 metres (148.3 ft).^[2]

• 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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