TNCC President E V K S Elangovan said Karnataka was coming up with excuses to "deny us our fair share" in Cauvery.
Karnataka's insistence "that they will construct a check dam at Mekedatu... Is violative of federalism and the final award given by the Cauvery Tribunal," he said.
Elangovan said though the Tribunal had given its final award in 2007 over sharing of Cauvery water between Tamil Nadu, Karnataka, Kerala and Puducherry, it had "lacked the vision" to draw a distress-sharing formula which had resulted in problems today.
Elangovan noted that political parties in Karnataka were united in this matter and had even met Prime Minister Narendra Modi to present their case and sought to know why Chief Minister J Jayalalithaa had not taken any such initiative.
The TNCC chief extended his party's support for tomorrow's fast by a farmer's body on the Cauvery issue scheduled here.