Poondi reservoir
| Poondi Reservoir | |
|---|---|
| Sathyamoorthy Reservoir | |
| Location | Thiruvallur District, Tamil Nadu, India |
| Coordinates | 13°11′6″N 79°51′36″E / 13.18500°N 79.86000°E |
| Type | Reservoir |
| Etymology | Chennai Mayor S. Satyamurti |
| Primary inflows | 34887 cusecs |
| Primary outflows | 36484 cusecs |
| Basin countries | India |
| Built | 1944 |
| Water volume | 3,231 million cubic feet (91.5×106 m3; 74,200 acre⋅ft) |
| Settlements | Chennai, Tamil Nadu |
Sathyamoorthy Saagar, also known as Poondy Reservoir, is the reservoir constructed across Kotralai (alias) Kosasthalai River in Tiruvallur district of Tamil Nadu state in India. It acts as the important drinking water source for Chennai Municipal Corporation which is located 60 km away from the lake.