The Mekedatu issue is a major water dispute between Karnataka and Tamil Nadu, centered on Karnataka’s plan to build a balancing reservoir across the Cauvery River at Mekedatu. Tamil Nadu strongly opposes it, arguing it violates Supreme Court rulings and threatens farmers’ livelihoods, while Karnataka insists it will only use its allocated share for Bengaluru’s drinking water and hydropower. The matter remains unresolved, with political, legal, and environmental battles ongoing.
The Mekedatu Project Is
- Proposed by Karnataka, the dam at Mekedatu aims to:
- Provide 4.75 TMC of drinking water to Bengaluru.
- Generate about 400 MW of hydropower.
- Act as a balancing reservoir to store Cauvery water.
Tamil Nadu’s Opposition
- Tamil Nadu argues the project:
- Violates the 2018 Supreme Court judgment and the Cauvery Water Disputes Tribunal award (2007), which already allocated water among basin states.
- Could reduce water flow downstream, affecting farmers’ irrigation and livelihoods.
- Has not received Union government approval for environmental clearance.
- The Tamil Nadu Assembly passed a unanimous resolution (June 2026) opposing the project and demanding a new tribunal.
Legal & Political Developments
- Supreme Court (May 2026) dismissed Tamil Nadu’s review petition, calling its challenge “premature” since the Detailed Project Report (DPR) is still under consideration.
- Tamil Nadu’s CM wrote to Prime Minister Narendra Modi demanding rejection of the project, citing violations of environmental laws and SC orders.
- Karnataka leaders, including CM D.K. Shivakumar, expressed willingness to hold talks but maintain the project is essential for Bengaluru’s water needs.
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Karnataka’s Position |
Tamil Nadu’s Position |
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Project is for drinking water only, not irrigation. |
Project will reduce water flow to Tamil Nadu farmers. |
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Claims it uses only allocated share of Cauvery water. |
Argues it violates SC judgment and CWDT award. |
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Says reservoir could help release water to TN during drought. |
Insists no new projects allowed in deficit Cauvery basin. |
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DPR submitted to Central Water Commission for approval. |
Demands Union govt reject approvals and form tribunal. |
Constitutional Provisions Involved
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Article 262: Empowers Parliament to adjudicate disputes relating to inter‑state rivers and river valleys.
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Parliament enacted the Inter‑State River Water Disputes Act, 1956, under which the Cauvery Water Disputes Tribunal (CWDT) was formed.
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Tamil Nadu argues that Mekedatu violates the CWDT award and the Supreme Court’s 2018 judgment.
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Article 131: Grants the Supreme Court original jurisdiction in disputes between states.
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Tamil Nadu has invoked this provision to challenge Karnataka’s Mekedatu plan.
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Article 21 (Right to Life): Often interpreted to include the right to clean water and environment.
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Both states use this as a moral‑legal basis: Karnataka for Bengaluru’s drinking water, Tamil Nadu for farmers’ irrigation rights.
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Article 48A & Article 51A(g): Directive Principles and Fundamental Duties relating to environmental protection.
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Environmental clearance for Mekedatu is contested under these constitutional obligations.
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Seventh Schedule – Union List & State List:
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“Water” is in the State List, but regulation of inter‑state rivers is in the Union List.
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This creates a federal tension: Karnataka claims state rights, while Tamil Nadu insists Union oversight is mandatory.
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In essence, Mekedatu embodies the tensions of cooperative federalism: Karnataka’s need for drinking water, Tamil Nadu’s dependence on irrigation, and the Union’s role as arbiter. The way this issue is resolved will set a precedent for how India manages shared natural resources—balancing development, ecology, and constitutional principles.