Ernakulam district · KSEB · Idamalayar basin · report 18 Sep 2026, 11:00 IST
Storage
68.0%
Previous 68.1%
Water level
157.50 m (516.7 ft)
FRL 169.00 m (554.5 ft)
Spillway release
—
Latest report
Rain forecast
13 mm
Next 72h 54 mm
Rate of rise(derived)
-0.02 m / 24 h
Downstream exposure
Idamalayar river to its confluence with the Periyar above Bhoothathankettu
Local bodies on this reach: Kuttampuzha, Kothamangalam, Pindimana, Neeleeswaram
District control room: 1077 / 0484-2423513
No rule curve (seasonal guide curve) is published for Idamalayar in a form this platform can verify, so none is shown. Where an operating curve is published — as for Idukki after the 2018 floods — it is plotted against actual storage instead of being estimated.
Idamalayar is at no alert level, with storage rising from 65.3% to 67.01% after 90.9 mm of rain; the water level is 157.08 m versus the 169 m FRL, with all gates closed and no spill. Forecast rain is lower at 25.6 mm in 24 hours and 39.7 mm over 72 hours, and the next alert would be triggered if the reservoir reaches its prescribed alert-level water threshold, which is not provided here.
Built across the Idamalayar, a tributary of the Periyar in Ernakulam district, and commissioned in 1985 with a 75 MW powerhouse. Releases from Idamalayar join the Periyar upstream of the Bhoothathankettu barrage.