The river Hemavathi is a tributary of Kaveri. This river originates in the Western Ghats – Ballala Rayana Durga – in Chikmagalur. The river joins with its main tributary, Yagachi river, at Hassan, then flows on to join Cauvery near Krishnarajasagara. The river is nearly 245 km long from its place of origin to where it converges with Cauvery.
The Hemavathi reservoir is a masonry dam with a central spillway and earthen flanks built across the river near Gorur village. It has a storage capacity of 37.1 tmcft. The water from the reservoir is used to irrigate 6.55 acres of land in Mandya, Hassan and Tumkur.