Dam Features
Type of DamConcrete – Gravity
PanchayathKuttampuzhaClassificationVHD (Very High Dam )
VillageKuttampuzhaMaximum Water Level (MWL)171.00 m
DistrictErnakulamFull Reservoir Level ( FRL)169.00 m
River BasinPeriyarStorage at FRL1089.80 Mm3
RiverIdamalayarHeight from deepest foundation102.40 m
Release from Dam to riverPeriyarLength373.00 m
Taluk through which release flowsKothamangalam, Kunnathunadu, Aluva, Kodungalloor, ParavoorSpillwayOgee type, 4 Nos. radial gates, each of size 11.5 x 9.7m
Year of completion1987Crest Level161.00 m
Name of ProjectIdamalayar HEPRiver Outlet2 Nos., Disperser valve
Purpose of ProjectHydro Power ( Primary)Officers in charge & phone No.Executive Engineer, Dam Safety Division No. III, Idamalayar PIN-686681 Phone – 9446008426
Installed capacity of the Project75 MWAssistant Executive Engineer, Dam Safety Sub Division, Idamalayar PIN- 686681 Phone-9496011977
Project Identification Code ( PIC)KL29VH0036
Idamalayar project is a low head Hydro Electric Scheme located in Ernakulam District of Kerala State. The river Idamalayar is a major tributary of Periyar originating from the Anamala Hills at about elevation 2520 m meeting Periyar at about 1.65km upstream of Bhoothathankettu barrage of Periyar Valley Irrigation Scheme. The Project got importance because of its multipurpose utility towards irrigation, industrial and domestic water supply and salinity control in the lower reaches of Periyar simultaneously with power generation.