The Tamil Nadu government said it would approach the Supreme Court to seek stalling of Karnataka government's attempt to construct two dams near Mekedatu across the Cauvery river.
Responding to DMK president M Karunanidhi's demand for convening an assembly session over the Mekedatu issue, chief minister O Panneerselvam said the state is filing a case in the Supreme Court to stall dam construction by Karnataka.
He recalled his letters to Prime Minister Narendra Modi, seeking intervention to advise Karnataka not to go ahead with the project.
Tamil Nadu Congress Committee president E V K S Elangovan also assailed Karnataka's move to construct check dams across Cauvery.
He told here that the party's state unit had proposed to call on Karnataka chief minister Siddaramaiah on this matter, but did not divulge details.
Elangovan announced Congress's support for the November 22 shutdown in the Cauvery delta districts called for by farmers' associations,
His party leaders would participate in the protests.
Last week, armed with the legal opinion that it has ownership over Mekedatu, Karnataka decided to go ahead with a reservoir there.
Mekedatu is close to the inter-state border, where the river Cauvery enters Tamil Nadu.
Karnataka has invited global tenders for a technical feasibility study.
Water resources minister MB Patil had said: The project site is in our territory. We cannot prevent them (TN) from opposing it, but the law is on our side. Our counsel on the Cauvery river dispute Fali Nariman told us that there's no legal hurdle.
At least 22 spots have been identified for the reservoir's location and the exact place would be decided after the techno feasibility study
The minister said the project will not submerge any private land.But 2,500 acres of forest land will go.
The state can store a little over 100tmcft of water in four major reservoirs of the Cauvery basin -KRS, Hemavathi, Harangi and Kabini. After releasing Tamil Nadu's quota, due to want of storage, the surplus water is let go.