Idamalayar
Ernakulam district · KSEB · Idamalayar basin · report 01 Nov 2026, 11:00 IST
Storage
71.9%
Previous 71.8%
Water level
158.99 m (521.6 ft)
FRL 169.00 m (554.5 ft)
Spillway release
—
Latest report
Rain forecast
32 mm
Next 72h 63 mm
Storage & water level — last 30 days
Risk breakdown
- • Level 158.99 m is below the blue alert level of 166.50 m
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
Rule curve — seasonal operating target
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.
Rainfall forecast — next 48 hours
Spillway releases
Current weather at the dam
- Temperature
- 23.0°C
- Humidity
- 97%
- Rain 24h
- 27.2 mm
- Wind
- 1 km/h
- Gusts
- 6 km/h
- Pressure
- 974 hPa
AI analysis
Idamalayar is at no alert level, with storage at 67.97% (up slightly from 67.94%) and water level at 157.47 m against the 169 m FRL; all gates are closed and spill is 0 cumecs. The slight rise follows 31 mm of rain in the past 24 hours, while forecast rain of 21 mm in 24 hours and 30.7 mm over 72 hours may push levels higher; the next alert would be triggered if the reservoir reaches its designated first-alert water-level threshold, which is not provided.
- Watch alert — Idamalayar · 03 Aug 2026, 10:14 IST
Environmental & carbon accounting
Net carbon sink- Reservoir methane (gross)
- 14,199 t CO₂e /yr
- Green carbon — catchment forest
- 91,680 t CO₂e /yr
- Blue carbon — sediment burial
- 2,178 t CO₂e /yr
- Hydropower grid offset
- 1,64,644 t CO₂e /yr
CH₄ from flooded land × GWP-100 (27), age-adjusted
Western Ghats forest sink, 60% forest cover assumed
≈ 2,178 indicative credits/yr
vs CEA grid 0.716 kg CO₂/kWh, 35% capacity factor
Net catchment balance: 79,659 t CO₂e/yr (forest + sediment sinks minus reservoir methane)
Estimate, not a measurement — built from IPCC 2019 Flooded Lands factors and public dam data. Kerala does not publish measured reservoir emissions. Credits shown are indicative, not registered. How this is calculated
Reservoir information bulletin
- Commissioned
- 1985
- Dam type
- Concrete gravity
- Height
- 102.0 m (334.6 ft)
- Length
- —
- Gross capacity
- 1089.0 MCM
- Live capacity
- 1089.0 MCM
- Catchment area
- 382 km²
- Full reservoir level
- 169.00 m (554.5 ft)
- Power station
- Idamalayar HEP
- Installed capacity
- 75.0 MW
- Purpose
- Hydroelectric
- Operator
- KSEB
- River
- Idamalayar
- Basin
- Periyar
- Nearby towns
- Bhoothathankettu, Kothamangalam
- Emergency contact
- 1077 / 0484-2422221
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.