Idukki district · KSEB · Periyar basin · report 18 Sep 2026, 11:00 IST
Storage
71.5%
Previous 53.8%
Water level
249.90 m (819.9 ft)
FRL 253.00 m (830.1 ft)
Spillway release
—
Latest report
Rain forecast
12 mm
Next 72h 41 mm
Rate of rise(derived)
+2.10 m / 24 h
At the current rate, Red alert band in ~1.0 days (2.10 m to go)
Downstream exposure
Periyar below Lower Periyar power house towards Neriamangalam and Bhoothathankettu
Local bodies on this reach: Neriamangalam, Kuttampuzha, Kothamangalam, Keerampara
District control room: 1077 / 04862-233111
No rule curve (seasonal guide curve) is published for Lower Periyar (Pambla) 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.
Lower Periyar is at no alert level, with storage rising from 61.16% to 68.02% and the water level at 249.5 m, 3.5 m below the 253 m FRL; all spillway gates remain closed with no discharge. The rise is being driven by 13.1 mm of recent rain, with another 16.4 mm forecast in 24 hours and 33 mm over 72 hours; the next alert would be triggered when the reservoir reaches its designated alert-level threshold, which is not provided.
The Lower Periyar scheme at Pamblassery uses releases from the upstream Periyar cascade and was commissioned in 1997 with an installed capacity of 180 MW.
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 | 31.00 / 34.95101.7 ft / 114.7 ft | — | — | 800 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 | 249.90 / 253.00819.9 ft / 830.1 ft | 71.5% | — | — | No warning — below every published alert level |
| NeriamangalamIdukki | — / —— / — | — | — | — | No warning — below every published alert level |
| IdukkiIdukki | 721.42 / 732.432366.9 ft / 2403.0 ft | 61.0% | — | — | No warning — below every published alert level |