Reservoir · Tamil Nadu · India · Tamil Nadu WRD
Thumbalahalli
8.6% full
Gross capacity
0.14 TMC (4 MCM)
Live capacity
0.11 TMC (3 MCM)
River
Poolapatti
Basin
Pennaiyar
Primary use
irrigation
Operator
Tamil Nadu Water Resources Dept
Coordinates
12.303°N, 78.156°E
Last updated
2026-10-28
Capacity in TMC
Thumbalahalli Dam has a gross capacity of 0.14 TMC (4 MCM), of which 0.11 TMC (3 MCM) is live storage; it is currently at 8.6% full, holding 0.00 TMC (0 MCM).
- Gross capacity
- 0.14 TMC (4 MCM)
- Live capacity
- 0.11 TMC (3 MCM)
- Current storage
- 0.00 TMC (0 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 Tamil Nadu WRD, which publishes million cubic metres. The percentage is labelled live or gross only when the stored volume matches that capacity.
Current fill
8.6%vs 7 days ago
N/Avs 1 year ago
N/A7-day trend
N/ADrought context
Rain over the last three months · 11 October 2026
Extremely dry
In the three months to 11 October 2026 the area around Thumbalahalli had extremely little rain for the season, a shortfall seen about one year in forty. Rainfall compared with the long-run record for the same season at this point (Copernicus Global Drought Observatory, SPI-3 index −2.11). Rain, not storage. India drought figures →
Weekly storage
Fill history — multi-year
About this reservoir
Data source
official
Storage data: Tamil Nadu WRD.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 12.303°N, 78.156°E · Open in Google Maps
About Thumbalahalli
As of October 28, 2026, Thumbalahalli has a published fill of 8.6%, holding 0.00 TMC (0 MCM). Gross capacity is 0.14 TMC (4 MCM). At this level the reservoir is critically low. Of that total, 0.11 TMC (3 MCM) is live storage.
No reading from about a week earlier is on file, so the 7-day change is not available.
Across the readings we hold for Thumbalahalli — 5 data points between June 26, 2026 and October 28, 2026 — the level has ranged from a low of 8.6% (October 28, 2026) to a high of 18.9% (June 26, 2026).
It is operated by Tamil Nadu Water Resources Dept primarily for irrigation. It lies within the Pennaiyar basin at 12.303°N, 78.156°E.
Key facts
- Current fill level
- 8.6%
- Water stored
- 0.00 TMC (0 MCM)
- Total capacity
- 0.14 TMC (4 MCM)
- Usable capacity
- 0.11 TMC (3 MCM)
- 7-day change
- N/A
- Primary use
- Irrigation
- River
- Poolapatti
- River basin
- Pennaiyar
- Operator
- Tamil Nadu Water Resources Dept
- Coordinates
- 12.303°N, 78.156°E
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 8.6% | 0 |
| 30 Aug 2026 | 12.3% | 0 |
| 22 Aug 2026 | 12.8% | 0 |
| 14 Aug 2026 | 13.3% | 0 |
| 26 Jun 2026 | 18.9% | 1 |