Mekedatu Dam and the Cauvery Water Dispute Explained

UPSC Mapping

Prelims

• Cauvery Basin
• CWMA
• CWRC
• Inter-State River Water Disputes

Mains

• GS Paper II – Federalism
• Inter-State Water Disputes

Quick Facts

River	Cauvery
Proposed By	Karnataka
Status	Awaiting Statutory Clearances

What is the Mekedatu Dam?

Mekedatu Dam is a proposed multipurpose reservoir planned by Karnataka at the Mekedatu Gorge (‘Goat’s Leap’ in Kannada) on the Cauvery River, below the confluence of the Arkavathi and Cauvery rivers. Karnataka proposes the project to supply drinking water to Bengaluru and generate hydroelectric power.

The project has become one of the most contentious issues in the long-standing Cauvery water dispute because Tamil Nadu fears it may affect downstream water availability.

Why is the Mekedatu Dam in News?

The Union Government recently informed that the 2018 Supreme Court judgment on the Cauvery dispute does not explicitly mandate obtaining downstream states’ consent before constructing new structures.

The statement has revived debate over Karnataka’s Mekedatu proposal and its implications for inter-state water sharing.

Origin and Evolution of the Cauvery Dispute

• Colonial agreements: The dispute originated from the 1892 and 1924 agreements between the Madras Presidency and the Princely State of Mysore.
• Post-1974 dispute: Karnataka rejected the 1924 agreement after its expiry, arguing that it disproportionately favoured Tamil Nadu and restricted dam construction.
• CWDT: The Union Government constituted the Cauvery Water Disputes Tribunal (CWDT) in 1990 under the Inter-State River Water Disputes Act, 1956, which delivered its final award in 2007.
• Supreme Court judgment: In 2018, the Supreme Court modified the allocation and fixed the water-sharing arrangement for 15 years.

Current Water-Sharing Framework

• Tamil Nadu: 404.25 tmcft.
• Karnataka: 284.75 tmcft.
• Kerala: 30 tmcft.
• Puducherry: 7 tmcft.
• Bengaluru’s needs: Tamil Nadu’s allocation was reduced to accommodate Bengaluru’s drinking water requirements.

Institutional Mechanism

• Cauvery Water Management Authority (CWMA): Apex body responsible for implementing the Supreme Court’s directions.
• Cauvery Water Regulation Committee (CWRC): Monitors reservoir levels and supervises water releases.

Arguments on the Mekedatu Dam

• Tamil Nadu’s objections: The reservoir may intercept catchment flows, reduce distress-time releases, affect Kuruvai and Samba crops, and submerge parts of the Cauvery Wildlife Sanctuary, impacting biodiversity and elephant corridors.
• Karnataka’s defence: The project will provide drinking water to Bengaluru, generate about 400 MW of hydroelectric power and store surplus monsoon flows without reducing Tamil Nadu’s allocated share.
• Legal position: The project remains pending before the Supreme Court and requires approvals from the Central Water Commission (CWC), Ministry of Environment, Forest and Climate Change (MoEFCC) and the CWMA.

Way Forward

Resolving the Mekedatu issue requires cooperative federalism, scientific basin management and compliance with judicial directions. Transparent data sharing, coordinated reservoir operations and institutional dialogue can strengthen trust among riparian states.

Future decisions should balance drinking water requirements, agricultural interests and environmental conservation while respecting constitutional and legal mechanisms governing inter-state river disputes. Official information is available through the Department of Water Resources and the MoEFCC.

Prelims Practice Corner

• Q1: The Mekedatu Dam is proposed on which river?
  (a) Krishna (b) Godavari (c) Cauvery (d) Tungabhadra
  Answer: (c) Cauvery.
• Q2: The Cauvery Water Disputes Tribunal was constituted in?
  (a) 1974 (b) 1986 (c) 1990 (d) 2007
  Answer: (c) 1990.
• Q3: Which body is the apex authority for implementing the Cauvery water-sharing arrangement?
  (a) Central Water Commission (b) CWMA (c) NITI Aayog (d) River Boards Authority
  Answer: (b) CWMA.
• Q4: The 2018 Supreme Court judgment allocated how much water to Karnataka?
  (a) 404.25 tmcft (b) 300 tmcft (c) 284.75 tmcft (d) 250 tmcft
  Answer: (c) 284.75 tmcft.
• Q5: Which state primarily opposes the Mekedatu Dam project?
  (a) Kerala (b) Puducherry (c) Andhra Pradesh (d) Tamil Nadu
  Answer: (d) Tamil Nadu.

Mains Practice Questions

Q1:

Examine the constitutional and institutional mechanisms for resolving inter-state river water disputes in India with reference to the Cauvery dispute. (10 marks)

Answer Structure:

• Intro: Explain inter-state river disputes.
• Body: Constitutional provisions, tribunals, Supreme Court, CWMA and implementation challenges.
• Conclusion: Emphasise cooperative federalism and basin-level governance.

Q2:

Discuss the major issues surrounding the proposed Mekedatu Dam and suggest measures for balancing development with federal cooperation. (15 marks)

Answer Structure:

• Intro: Introduce the Mekedatu project.
• Body: Water sharing, environmental concerns, legal issues, stakeholders and institutional mechanisms.
• Conclusion: Advocate consensus-based river basin management.

FAQs on Mekedatu Dam

Why is the Mekedatu Dam controversial?

Tamil Nadu argues that the project may affect downstream water availability and ecology, while Karnataka maintains it will store surplus monsoon water without reducing Tamil Nadu’s allocated share.

What is the role of the CWMA?

The Cauvery Water Management Authority is the apex body established to implement the Supreme Court’s 2018 directions regarding Cauvery water sharing.

Which clearances are required for the Mekedatu Dam?

The project requires approvals from the Central Water Commission, the Ministry of Environment, Forest and Climate Change and the CWMA, and remains under judicial consideration.