Mekedatu Dam Project Faces Major Setback as CWC Demands Extensive Revisions from Karnataka

Well, it seems the controversial Mekedatu Balancing Reservoir-cum-Drinking Water Project has hit yet another snag. The Central Water Commission (CWC) recently returned Karnataka’s Detailed Project Report (DPR), requesting some pretty substantial revisions. For a project that’s been debated for years and is pivotal for Bengaluru's water security, this is a significant development, pushing the timeline back once more and reigniting the long-standing water-sharing tensions.

The core issue, as outlined in a pointed CWC letter to Karnataka on June 29, 2026, revolves around the "proposed consumptive use of water" – which, simply put, is deemed "more than allocation." It’s a familiar refrain in water-sharing disputes, isn't it? This isn't just a minor tweak they're asking for; the CWC has pointed to fundamental discrepancies in how Karnataka plans to utilize the precious Cauvery waters, suggesting a significant miscalculation on the state’s part.

Karnataka initially submitted its DPR way back in January 2019. Fast forward a bit, and a revised scheme, incorporating the Mekedatu Balancing Reservoir and additional components like the Shivanasamudra Run-of-River Power (SRRP) Project, was put forward on April 21, 2026. This revised plan also included a diversion weir across the Cauvery. Here's where it gets interesting: the revised proposal upped the ante significantly, suggesting a consumptive use of 6.95 tmcft, a noticeable jump from the earlier 4.75 tmcft that was intended solely for the Bengaluru Metropolitan Region's drinking water needs. It’s a substantial increase that immediately drew scrutiny.

But here's the catch, and it’s a big one: The Supreme Court, in its landmark February 16, 2018, order, had finalized a total consumptive use allocation of 6.5 tmcft for Karnataka. This allocation was meant to cover both urban and rural populations, and critically, it already factored in the present consumptive use. The CWC's observation is crystal clear: if you consider the 36-year-old existing consumptive use of 2.9 tmcft, then the balance available for new projects like Mekedatu should be no more than 3.6 tmcft. Suddenly, Karnataka’s proposed 6.95 tmcft looks dramatically out of sync with the judicial directive, exceeding it by almost double the available balance for new projects.

Beyond the raw water use numbers, the CWC also raised a significant eyebrow at the calculation behind the proposed reservoir's live storage capacity. They stated quite directly that the basis for determining the 59.46 tmcft live storage capacity for Mekedatu "does not seem to be appropriate." It suggests a need for a fundamental re-evaluation, not just a minor adjustment, of the project's engineering and hydrological assumptions, indicating potential flaws in the very foundation of the design.

So, what's next? The CWC has unequivocally asked Karnataka to submit a completely revised DPR. This isn't just about tweaking a few figures; it needs to be fully compliant with the Cauvery Water Disputes Tribunal (CWDT) Award and the CWC's own comprehensive guidelines for the "Submission, Appraisal & Acceptance of Irrigation and Multipurpose Projects, 2017." It's a clear call for strict adherence to established protocols and judicial allocations, leaving little room for ambiguity.

Naturally, sources within the Karnataka government are playing down the development, characterizing it as "just a procedural thing" and insisting that "appropriate revisions have been made." But for a project that has consistently sparked heated debates and legal battles, especially with neighbouring Tamil Nadu, such procedural matters often hide deeper, more contentious issues that require meticulous attention.

Tamil Nadu, as expected, has been vehemently opposing the project, arguing that it would be detrimental to its interests, particularly concerning water flows downstream. Karnataka, on the other hand, maintains that the Mekedatu reservoir, proposed in Bengaluru South District (formerly Ramanagara), would actually help regulate flows to Tamil Nadu, ensuring a more consistent supply rather than hindering it. The Supreme Court even refused to entertain Tamil Nadu’s application against the project once, deeming it premature. However, with the CWC now stepping in with these significant objections, the situation becomes even more intricate and adds considerable weight to Tamil Nadu's long-standing concerns.

It's a delicate balance, isn't it? Managing precious water resources for multiple states, balancing critical drinking water needs with agricultural demands, and navigating complex legal frameworks. Karnataka now has its work cut out to present a revised DPR that not only satisfies its own ambitions but, crucially, aligns with the CWC's stringent requirements and the Supreme Court's directives. The ball, for now, is firmly back in their court, and all eyes will be on their next move.