Storage
62.7%
Previous 62.5%
Water level
721.96 m (2368.6 ft)
FRL 732.43 m (2403.0 ft)
Spillway release
—
Latest report
Rain forecast
14 mm
Next 72h 35 mm
Storage & water level — last 30 days
Risk breakdown
- • Level 721.96 m is below the blue alert level of 729.02 m
Rate of rise(derived)
+0.12 ft / 24 h
Downstream exposure
Periyar below Cheruthoni / Idukki towards Lower Periyar and Neriamangalam
Local bodies on this reach: Vazhathoppu, Konnathady, Vellathooval, Neriamangalam, Kuttampuzha
District control room: 1077 / 04862-233111
Rule curve — seasonal operating target
Target today
98%
Actual storage
62.7%
Against curve
-35.2 pts
- May 20 — Pre-monsoon minimum — maximum flood cushion (indicative)
- Jul 10 — Confirmed KSEBL checkpoint: 82 % full, 18 % cushion retained (confirmed)
- Nov 1 — End of north-east monsoon filling (indicative)
- Basis: % of gross storage.
- Provenance: Post-2018 revised operating practice. The 10 July checkpoint — reservoir held at 82 % of gross storage, i.e. an 18 % flood cushion — is the confirmed KSEBL value; the rest of the curve is an indicative shape derived from the published seasonal operating pattern, not an official table.
- 2018 trace — Reconstructed from KSEBL daily reservoir bulletins for the 2018 south-west monsoon (gross-storage %). The 9 August spillway opening at Cheruthoni is the confirmed event; intermediate points are indicative daily readings, not an official series. Peak: 2018 peak — reservoir at full reservoir level, all shutters in operation.
- 2019 trace — Reconstructed from KSEBL daily reservoir bulletins for the 2019 south-west monsoon (gross-storage %). Indicative daily readings held for comparison with 2018; not an official series. Peak: 2019 season high — no emergency spill required.
Rainfall forecast — next 48 hours
Spillway releases
Current weather at the dam
- Temperature
- 21.3°C
- Humidity
- 100%
- Rain 24h
- 16.3 mm
- Wind
- 5 km/h
- Gusts
- 12 km/h
- Pressure
- 932 hPa
AI analysis
Idukki is at no alert level, with storage at 60.83% (up from 58.38%) and the water level at 721.382 m, 11.048 m below the 732.43 m FRL; there is no spill. The rise is being driven by 75.7 mm of rain in the past 24 hours, though only 15.7 mm is forecast in the next 24 hours and 39.5 mm over 72 hours; the next alert would be triggered when the water level reaches the applicable alert threshold, which is not provided.
- Warning alert — Idukki · 03 Aug 2026, 10:14 IST
Environmental & carbon accounting
Net carbon sink- Reservoir methane (gross)
- 15,285 t CO₂e /yr
- Green carbon — catchment forest
- 1,55,760 t CO₂e /yr
- Blue carbon — sediment burial
- 2,920 t CO₂e /yr
- Hydropower grid offset
- 1.71 Mt CO₂e /yr
CH₄ from flooded land × GWP-100 (27), age-adjusted
Western Ghats forest sink, 60% forest cover assumed
≈ 2,920 indicative credits/yr
vs CEA grid 0.716 kg CO₂/kWh, 35% capacity factor
Net catchment balance: 1,43,395 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
- 1976
- Dam type
- Double curvature arch
- Height
- 168.9 m (554.2 ft)
- Length
- 366 m (1200.3 ft)
- Gross capacity
- 1460.0 MCM
- Live capacity
- 1460.0 MCM
- Catchment area
- 649 km²
- Full reservoir level
- 732.43 m (2403.0 ft)
- Power station
- Moolamattom (Idukki HEP)
- Installed capacity
- 780.0 MW
- Purpose
- Hydroelectric
- Operator
- KSEB
- River
- Periyar
- Basin
- Periyar
- Nearby towns
- Cheruthoni, Thodupuzha, Kattappana
- Emergency contact
- 1077 / 0486-2222011
Idukki is India's first double-curvature arch dam, built across the Periyar between the Kuravan and Kurathi hills and commissioned in 1976. Together with the Cheruthoni and Kulamavu dams it forms the Idukki reservoir, which feeds the 780 MW underground powerhouse at Moolamattom — the largest hydroelectric station in Kerala.
Periyar river system — levels & flow
Every monitored structure on this river, ordered by how much water it is passing downstream right now.
| Structure | Level / FRL (m) | Storage | Inflow | Outflow | Status |
|---|---|---|---|---|---|
| Bhoothathankettu (Barrage)Ernakulam | 32.00 / 34.95105.0 ft / 114.7 ft | — | — | 32 m³/s | Controlled release — water is being released in regulated quantities, not a danger warning |
| MullaperiyarIdukki | — / 46.33— / 152.0 ft | — | — | — | No warning — below every published alert level |
| Lower Periyar (Pambla)Idukki | 250.60 / 253.00822.2 ft / 830.1 ft | 77.7% | — | — | No warning — below every published alert level |
| NeriamangalamIdukki | — / —— / — | — | — | — | No warning — below every published alert level |
| IdukkiIdukki | 721.96 / 732.432368.6 ft / 2403.0 ft | 62.7% | — | — | No warning — below every published alert level |