Reservoir · Tamil Nadu · India · CWC
Thumbalahalli
18.9% full
Total capacity
4 hm³
Live storage
3 hm³
River
Poolapatti
Basin
Pennaiyar
Primary use
irrigation
Operator
Tamil Nadu Water Resources Dept
Coordinates
12.303°N, 78.156°E
Last updated
2026-06-26
Current fill
18.9%vs 7 days ago
0.0%stable
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 June 26, 2026, Thumbalahalli is filled to 18.9% of its total capacity, holding roughly 1 hm³ of water out of a maximum 4 hm³. At this level the reservoir is critically low. Of that total, about 3 hm³ is usable (live) storage.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts).
Across the readings we hold for Thumbalahalli — 1 data points between June 26, 2026 and June 26, 2026 — the level has ranged from a low of 18.9% (June 26, 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
- 18.9%
- Water stored
- 1 hm³
- Total capacity
- 4 hm³
- Usable capacity
- 3 hm³
- 7-day change
- No change
- Primary use
- Irrigation
- River
- Poolapatti
- River basin
- Pennaiyar
- Operator
- Tamil Nadu Water Resources Dept
- Coordinates
- 12.303°N, 78.156°E
- Last updated
- June 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Jun 2026 | 18.9% | 1 |
Frequently asked questions
What is the current water level of Thumbalahalli?
As of June 26, 2026, Thumbalahalli is at 18.9% of its capacity, holding approximately 1 hm³ of water, according to Tamil Nadu WRD data.
Is Thumbalahalli reservoir full?
No. As of June 26, 2026, Thumbalahalli is critically low at 18.9% of its capacity, so it is not full.
Is the water level at Thumbalahalli rising or falling?
The level at Thumbalahalli has been broadly stable over the latest week on record (0.0 points).
How much water can Thumbalahalli hold?
Thumbalahalli has a total capacity of 4 hm³, of which about 3 hm³ is usable storage.
Where is Thumbalahalli reservoir located?
Thumbalahalli is located in Tamil Nadu, India, within the Pennaiyar basin (coordinates 12.303°N, 78.156°E).
What is Thumbalahalli used for?
Thumbalahalli is used primarily for irrigation, and is managed by Tamil Nadu Water Resources Dept.