Archive · 28 Jul 2026
Mekedatu Dam Divides Karnataka and Tamil Nadu
The Mekedatu reservoir is a project proposed by Karnataka to store water for Bengaluru's drinking needs.
Tamil Nadu opposes it, fearing it will control water flow and harm farming.
Both states have been arguing for years, with Karnataka saying the project is legal and Tamil Nadu saying it needs more discussion.
The Indian government is stuck in the middle, trying to balance both sides.
The project is still not approved and needs more legal and environmental checks.
The Mekedatu reservoir is a proposed project by Karnataka to secure Bengaluru's drinking water supply.
Tamil Nadu opposes the project, fearing it will affect downstream irrigation in the Cauvery delta.
Karnataka argues the project is legal under the Supreme Court's 2018 judgment.
Tamil Nadu insists the project should be examined within the broader legal framework of interstate rivers.
The project is pending multiple clearances, including environmental and forest approvals.
- Who
- Karnataka and Tamil Nadu governments, with political parties in both states rallying public sentiment.
- What
- A proposed balancing reservoir and drinking water project on the Cauvery River.
- When
- First proposed nearly three decades ago, with recent discussions triggered by a letter from Tamil Nadu's Chief Minister in July 2026.
- Where
- Near the Karnataka-Tamil Nadu border, at the confluence of the Cauvery and Arkavathy rivers.
- Why
- Karnataka seeks to secure Bengaluru's long-term drinking water needs, while Tamil Nadu fears it will affect downstream irrigation.
Karnataka's Perspective
Tamil Nadu's Perspective
Project Necessity
Karnataka's Perspective
Karnataka argues that the Mekedatu reservoir is essential for securing Bengaluru's long-term drinking water needs and does not seek an additional share of Cauvery waters.
Tamil Nadu's Perspective
Tamil Nadu opposes the project, fearing it will give Karnataka greater control over water release downstream, affecting irrigation in the Cauvery delta.
Legal Interpretation
Karnataka's Perspective
Karnataka believes the Supreme Court's 2018 judgment does not require the consent of downstream states for constructing the reservoir.
Tamil Nadu's Perspective
Tamil Nadu argues that the project should be examined within the broader legal framework governing interstate rivers and the rights of downstream states.
- Project Name
- Mekedatu Balancing Reservoir
- Location
- Near Karnataka-Tamil Nadu border, Cauvery River
- Estimated Cost
- Rs 9,000 crore
- Storage Capacity
- 67 tmcft
- Drinking Water Supply
- 4 tmcft to Bengaluru and surrounding areas
- Hydroelectric Power Generation
- 400 MW
- Current Status
- Pending multiple clearances, including environmental and forest approvals