Reservoir · Kerala · India · KSEB
Idamalayar
Idamalayar Dam
71.4% of gross capacity
Gross capacity
38.8 TMC (1,098 MCM)
Live capacity
36.2 TMC (1,026 MCM)
River
Periyar
Basin
West Flowing
Primary use
hydropower
Operator
KSEB
Coordinates
10.200°N, 76.717°E
Last updated
2026-10-27
Capacity in TMC
Idamalayar Dam has a gross capacity of 38.8 TMC (1,098 MCM), of which 36.2 TMC (1,026 MCM) is live storage; it is currently at 71.4% of gross capacity, holding 27.7 TMC (784 MCM) (76.4% of live capacity).
- Gross capacity
- 38.8 TMC (1,098 MCM)
- Live capacity
- 36.2 TMC (1,026 MCM)
- Current storage
- 27.7 TMC (784 MCM)
TMC is thousand million cubic feet, the unit used in Indian water reporting. 1 TMC = 28.3168 million cubic metres (MCM). Figures are converted from KSEB, which publishes million cubic metres. The percentage is labelled live or gross only when the stored volume matches that capacity.
Current fill
71.4%vs 22 Oct 2026
+1.2 ppgaining
vs 1 year ago
N/ATrend
↑rising
Drought context
Rain over the last three months · 11 October 2026
Near normal
In the three months to 11 October 2026 the area around Idamalayar had rain close to normal for the season. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −0.98). Rain, not storage. India drought figures →
Weekly storage
Fill history — multi-year
About this reservoir
Data source
official
Storage data: KSEB.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 10.200°N, 76.717°E · Open in Google Maps
About Idamalayar Dam
As of October 27, 2026, Idamalayar Dam is filled to 71.4% of its gross capacity, holding 27.7 TMC (784 MCM) of a gross 38.8 TMC (1,098 MCM). At this level the reservoir is within its normal operating range. Of that total, 36.2 TMC (1,026 MCM) is live storage.
Since October 22, 2026 the fill level has risen by 1.2 percentage points.
Across the readings we hold for Idamalayar Dam — 25 data points between June 25, 2026 and October 27, 2026 — the level has ranged from a low of 26.4% (June 25, 2026) to a high of 71.4% (October 27, 2026).
It is operated by KSEB primarily for hydroelectric power. It lies within the West Flowing basin at 10.200°N, 76.717°E.
Key facts
- Current fill level
- 71.4% of total capacity
- Water stored
- 27.7 TMC (784 MCM)
- Total capacity
- 38.8 TMC (1,098 MCM)
- Usable capacity
- 36.2 TMC (1,026 MCM)
- Change since October 22, 2026
- ▲ 1.2 pp
- Primary use
- Hydroelectric power
- River
- Periyar
- River basin
- West Flowing
- Operator
- KSEB
- Coordinates
- 10.200°N, 76.717°E
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 71.4% | 784 |
| 23 Oct 2026 | 70.5% | 774 |
| 22 Oct 2026 | 70.2% | 715 |
| 15 Oct 2026 | 67.6% | 688 |
| 8 Oct 2026 | 69.5% | 707 |
| 1 Oct 2026 | 69.3% | 705 |
| 24 Sep 2026 | 69.0% | 702 |
| 17 Sep 2026 | 68.1% | 748 |
| 10 Sep 2026 | 69.1% | 703 |
| 3 Sep 2026 | 69.7% | 709 |
| 28 Aug 2026 | 67.8% | 744 |
| 27 Aug 2026 | 67.0% | 682 |