Municipal administration minister K N Nehru, and school education minister Anbil Mahesh Poyyamozhi opened the sluices in Kallanai to release water in rivers Cauvery, Vennar, Kollidam and GA Canal. Water released from the Mettur reservoir on May 24 for kuruvai cultivation in the delta districts reached the Mukkombu barrage in Trichy and Kallanai on Friday.