CHENNAI: Charging Karnataka with "unjustly utilising" Cauvery water for summer irrigation, Tamil Nadu Chief Minister Jayalalithaa today asked Prime Minister Manmhohan Singh to convene a meeting of the Cauvery River Authority to discuss the issue.

Karnataka has been unjustly utilising the water for summer irrigation from February to May by depleting storage in its four major reservoirs, she said in a letter to Singh.