"The Tamil Nadu government should immediately convene an all-party meeting on the issue affecting the livelihood of Tamil Nadu farmers. It should approach the Supreme Court and Cauvery Water Disputes Tribunal," he said in a statement.
The 91-year-old DMK patriarch also demanded that the government convene an Assembly session and pass a resolution in this regard, condemning the Karnataka government and the Minister concerned.
Patil had said he had recently spoken to senior counsel Fali Nariman who had stated that the project would not violate any water-sharing agreement.
The project envisages providing drinking water for the whole of Bengaluru and some parts of old Mysore by 2030.
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Karunanidhi further urged the Tamil Nadu government to impress upon the Central government that this scheme "cannot be and should not be implemented" without the approval from the Union government and the Cauvery Water Disputes Tribunal.
While water sharing from Karnataka has been a major challenge even without this project, Patil's statement has further affected farmers of Tamil Nadu, he said, adding that DMK is in the forefront of the issue, struggling for the welfare of Tamil Nadu farmers.