Storage
—
Water level
—
FRL 46.33 m (152.0 ft)
Spillway release
—
Latest report
Rain forecast
23 mm
Next 72h 38 mm
Storage & water level — last 30 days
Risk breakdown
- • No official alert levels defined
- • No official alert levels are defined for this structure
Rate of rise(derived)
Trend needs two bulletins
Projection needs 3 days of bulletins (0 held).
Downstream exposure
The downstream reach and local body list for Mullaperiyar have not been transcribed from a District Disaster Management Plan yet, so none are shown.
District control room: 1077 / 04862-233111
Rule curve — seasonal operating target
No rule curve (seasonal guide curve) is published for Mullaperiyar 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
- 20.1°C
- Humidity
- 95%
- Rain 24h
- 5.3 mm
- Wind
- 2 km/h
- Gusts
- 7 km/h
- Pressure
- 899 hPa
AI analysis
An AI analysis for this reservoir will appear after the next scheduled briefing.
- Watch alert — Mullaperiyar · 06 Aug 2026, 18:30 IST
- Watch alert — Mullaperiyar · 04 Aug 2026, 05:45 IST
Environmental & carbon accounting
Net carbon sink- Reservoir methane (gross)
- 3,375 t CO₂e /yr
- Green carbon — catchment forest
- 1,49,760 t CO₂e /yr
- Blue carbon — sediment burial
- 886 t CO₂e /yr
- Hydropower grid offset
- Not enough data /yr
CH₄ from flooded land × GWP-100 (27), age-adjusted
Western Ghats forest sink, 60% forest cover assumed
≈ 886 indicative credits/yr
vs CEA grid 0.716 kg CO₂/kWh, 35% capacity factor
Net catchment balance: 1,47,272 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
- 1895
- Dam type
- Composite gravity (lime-surkhi masonry)
- Height
- 53.7 m (176.0 ft)
- Length
- 366 m (1200.3 ft)
- Gross capacity
- 443.2 MCM
- Live capacity
- 299.1 MCM
- Catchment area
- 624 km²
- Full reservoir level
- 46.33 m (152.0 ft)
- Power station
- Lower Periyar Power House (Tamil Nadu, 175 MW)
- Installed capacity
- —
- Purpose
- Irrigation and power diversion to Tamil Nadu; Periyar Tiger Reserve reservoir
- Operator
- Tamil Nadu Water Resources Department (operated under 1886 lease; Kerala holds the land)
- River
- Periyar
- Basin
- Periyar
- Nearby towns
- Kumily, Vandiperiyar, Vallakkadavu, Upputhara, Thekkady
- Emergency contact
- Idukki District Control Room 1077 / KSDMA 1070
Built 1887-1895 by Col. John Pennycuick across the Periyar at its confluence with the Mullayar, the dam diverts water through a tunnel to the Vaigai basin in Tamil Nadu. Its 152 ft (46.33 m) design FRL was cut to 136 ft in 1979 on safety grounds, restored to 142 ft (43.28 m) by the Supreme Court in 2006 and reaffirmed in 2014, with a Supervisory Committee monitoring the rule level. Because the dam is operated by Tamil Nadu, its readings are published through the Supervisory Committee and Idukki district administration rather than the KSEB or Kerala Irrigation bulletins, so no automated KSDMA measurement feed exists for it.
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 |