Tamil Nadu CM Urges PM Modi to Halt Mekedatu Project Over Hydro-Legal Disputes

Legal Challenges to Federal Policy

In a formal communication to Prime Minister Narendra Modi on July 28, 2026, Tamil Nadu Chief Minister C. Joseph Vijay demanded the federal government withhold all administrative and statutory clearances for the proposed Mekedatu reservoir. The Chief Minister specifically challenged a July 27 statement made in the Rajya Sabha by Raj Bhushan Choudhary, the Union Minister of State for Jal Shakti. Choudhary had suggested that a 2018 Supreme Court ruling did not explicitly require Karnataka to obtain consent from lower riparian states before building structures across the Cauvery river.

Mr. Vijay argued that the Minister’s interpretation ignores established legal precedents. He cited the Alamatti case, where a Supreme Court Constitution Bench ruled that Karnataka could not proceed with construction without the explicit agreement of other riparian states and federal approval. The Chief Minister insisted that the federal government withdraw the Minister's reply, labeling it a deviation from settled inter-state water law.

The Framework of the Water Sharing Award

The Chief Minister’s argument rests on the preservation of the Cauvery Water Disputes Tribunal (CWDT) Award. According to Mr. Vijay, the Supreme Court affirmed Clause XVIII of this award, which dictates that any state regulation of water must remain consistent with the Tribunal's orders. He highlighted several key components of the legal framework:

• Clause XI: Explicitly forbids upper riparian states from altering scheduled water deliveries to downstream regions without mutual agreement.
• Clause XX: Mandates that any modifications to the existing sharing award can only occur through unanimous agreement among the affected states.
• Coordinated Regulation: Mr. Vijay referenced the Pambar Hydro-electric Project in Kerala, where the Tribunal required joint release schedules even for minimal water usage to ensure downstream irrigation remained protected.

Economic and Constitutional Implications

The Chief Minister emphasized that the Mekedatu proposal is not a simple engineering task but a significant legal matter. He noted that the Central Water Commission had already returned Karnataka’s 2019 Detailed Project Report for failing to comply with Tribunal guidelines. This prior rejection, he argued, proves that adherence to the award is a non-negotiable prerequisite.

The Cauvery river serves as a vital resource for millions of citizens and farmers across South India. Mr. Vijay warned that bypassing the established legal pattern of water releases would undermine the constitutional mechanisms designed to govern inter-state rivers. He called for a rigorous technical and legal audit of the project that prioritizes the rights of lower riparian states before any further consideration is granted by the Union government.

Source: The Hindu — Home