Reservoir · Tamil Nadu · India · CWC
Thumbalahalli
12.3% 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
2026-08-30
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 12% 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 the Central Water Commission bulletin, which publishes million cubic metres.
Current fill
12.3%vs 7 days ago
-0.5%losing
vs 1 year ago
N/A7-day trend
→stable
Weekly storage
Fill history — multi-year
About this reservoir
Data source
official
Storage data: CWC (Central Water Commission) Weekly Storage Bulletin, India.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 12.303, 78.156 · Open in Google Maps
About Thumbalahalli
As of August 30, 2026, Thumbalahalli is filled to 12.3% of its total capacity, holding 0.00 TMC (0 MCM) of a gross 0.14 TMC (4 MCM). At this level the reservoir is critically low. Of that total, 0.11 TMC (3 MCM) is live storage.
Over the most recent week on record the fill level has held broadly steady (-0.5 pts).
Across the readings we hold for Thumbalahalli — 4 data points between June 26, 2026 and August 30, 2026 — the level has ranged from a low of 12.3% (August 30, 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
- 12.3%
- Water stored
- 0.00 TMC (0 MCM)
- Total capacity
- 0.14 TMC (4 MCM)
- Usable capacity
- 0.11 TMC (3 MCM)
- 7-day change
- ▼ 0.5 pts
- Primary use
- Irrigation
- River
- Poolapatti
- River basin
- Pennaiyar
- Operator
- Tamil Nadu Water Resources Dept
- Coordinates
- 12.303°N, 78.156°E
- Last updated
- August 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Aug 2026 | 12.3% | 0 |
| 22 Aug 2026 | 12.8% | 0 |
| 14 Aug 2026 | 13.3% | 0 |
| 26 Jun 2026 | 18.9% | 1 |