Environment & Climate

Centre Reaffirms Stand on Cauvery Basin Mekedatu Reservoir in Lok Sabha

31 July 2026UPSCSSC

In Brief

Maintains that Mekedatu project requires detailed consensus from lower riparian state Tamil Nadu prior to clearance.

The Union Water Resources Ministry reiterated its official position in the Lok Sabha regarding Karnataka’s proposed Mekedatu balancing reservoir project across the Cauvery river, stating that clearance requires formal concurrence from lower riparian Tamil Nadu.

Karnataka proposes constructing a 67,161 million cubic feet (mcft) capacity reservoir at Mekedatu in Ramanagara district to generate 400 MW of hydroelectric power and secure drinking water for Bengaluru. Tamil Nadu strongly opposes the project, maintaining that it violates the Cauvery Water Disputes Tribunal’s final award and Supreme Court directives by altering natural flows.

This issue regularly features in competitive exams under federal disputes and environmental hydrology. Key focus areas include Cauvery river origin (Talakaveri, Brahmagiri hills), key tributaries (Kabini, Hemavati, Arkavathi, Bhavani), and legal doctrines governing inter-state river basins.

UPSC Study NotesHIGHGS2 — Polity & Governance (Inter-State Relations) & GS3 — Environment & Geography

GS2 — Polity & Governance (Inter-State Relations) & GS3 — Environment & Geography

📌 Exam Angle

Prelims can test Cauvery basin physical geography (tributaries like Arkavathi, Kabini) and statutory bodies like the Cauvery Water Management Authority. Mains questions will probe cooperative federalism, upper versus lower riparian rights, and judicial frameworks for resolving inter-state water disputes.

⚠️ Key Concerns

Karnataka prioritizes urban water security for Bengaluru, whereas downstream Tamil Nadu fears reduced environmental flows violating Supreme Court mandates. Unilateral project advancement bypasses statutory consensus mechanisms, triggering federal friction and ecological concerns in the basin.

💡 Why It Matters

This dispute exemplifies intensifying hydro-conflicts driven by rapid urbanization and climate vulnerability across Indian river basins. It showcases the delicate constitutional balance between state developmental needs and central regulatory oversight in shared river management.

🔑 Must Remember

• Mekedatu is a proposed multi-purpose balancing reservoir at the Cauvery-Arkavathi confluence in Ramanagara. • Detailed Project Report clearance statutorily mandates approval from the Cauvery Water Management Authority and Tamil Nadu. • River Cauvery originates at Talakaveri (Brahmagiri Hills); key tributaries include Hemavati, Kabini, Bhavani, and Arkavathi.

📝 Key Terms

Mekedatu ReservoirCauvery Water Management AuthorityRiparian RightsCooperative FederalismInter-State River Water Disputes ActArkavathi RiverWater SecurityHydropolitics

Centre Reaffirms Stand on Cauvery Basin Mekedatu Reservoir in Lok Sabha

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