Idukki district · KSEB · Periyar basin · report 04 Aug 2026, 14:00 IST
Storage
100.0%
Previous 100.0%
Water level
253.00 m (830.1 ft)
FRL 253.00 m (830.1 ft)
Spillway release
80.0 cumecs
Latest report
Rain forecast
35 mm
Next 72h 75 mm
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 (Pambla) is at red alert, with storage at 100%—up from 98.11%—and the water level at the full reservoir level of 253 m; it is spilling 144 cumecs through upper vents 3 at 40 cm and 4 at 50 cm. The rise is driven by 52.2 mm of rain in the past 24 hours, with another 35.4 mm forecast in 24 hours and 75.2 mm in 72 hours; as red is already the highest level, further inflow would trigger increased spill-gate releases rather than a higher alert.
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 |
|---|---|---|---|---|---|
| Lower Periyar (Pambla)Idukki | 253.00 / 253.00830.1 ft / 830.1 ft | 100.0% | — | 80 m³/s | Danger |
| BhoothathankettuErnakulam | 28.00 / 34.9591.9 ft / 114.7 ft | — | — | — | Normal |
| MullaperiyarIdukki | — / 46.33— / 152.0 ft | — | — | — | Watch |
| NeriamangalamIdukki | — / —— / — | — | — | — | Watch |
| IdukkiIdukki | 715.49 / 732.432347.4 ft / 2403.0 ft | 43.7% | — | — | Normal |