IN NEWS: Mekedatu Dam faces renewed focus amid environmental concerns, inter-state dispute, and project acceleration efforts

ANALYSIS

Introduction

The proposed Mekedatu balancing reservoir project on the Cauvery River has re-entered the spotlight due to multiple developments including environmental concerns (pollution inflow), land submergence, inter-state disputes, and administrative progress. The project is positioned as a long-term solution to Bengaluru’s water crisis but raises significant ecological and federal challenges.

Project Overview and Recent Developments

The project involves construction of a balancing reservoir near the confluence of Cauvery and Arkavathi rivers (Kanakapura region). Recent updates indicate:

• Land Submergence
  • Around 5,173 hectares likely to be submerged
  • Includes forest land, raising ecological concerns
• Project Timeline & Progress
  • DPR under preparation for submission to authorities
  • Likely commencement within 2 years (subject to approvals)
  • Dedicated technical team formed to expedite execution
• Utility
  • Storage capacity: ~67 TMC
  • Drinking water supply to Bengaluru (25–30 years security)
  • Hydropower generation: ~400 MW

Environmental Concerns

A recent report highlights the risk of pollution transfer to the reservoir site:

• Pollution Pathway
  • Untreated sewage from Bengaluru flows via Vrishabhavathi River
  • Eventually joins Arkavathi → Cauvery basin
• Key Risks
  • Water contamination (heavy metals, industrial waste)
  • Reduced dissolved oxygen → ecological degradation
  • Risk of polluted water stagnation in reservoir
• Core Issue
  • Focus on infrastructure without addressing upstream pollution sources

Inter-State Dispute Dimension

• Tamil Nadu’s Concerns
  • Reduction in downstream Cauvery water flow
  • Impact on agriculture in delta regions
• Karnataka’s Position
  • Project within its territory
  • Ensures regulated release of water
• Judicial Development
  • Supreme Court termed TN’s objections as premature
  • Karnataka must still adhere to Cauvery water sharing obligations

Governance & Institutional Aspects

• Role of Central Water Commission (CWC) in DPR approval
• Formation of technical teams (KERS-led) for implementation
• Involvement of agencies like:
  • Cauvery Neeravari Nigam Limited (CNNL)

Implications

1. Urban Water Security

• Critical for Bengaluru’s future water needs
• Reduces dependency on over-exploited groundwater

2. Environmental Sustainability

• Risk of creating a polluted reservoir if upstream issues ignored
• Forest submergence → biodiversity loss

3. Federal Tensions

• Rekindles Cauvery river dispute
• Tests cooperative federalism mechanisms

4. Economic & Infrastructure Significance

• Cost-effective multipurpose project
• Boost to hydropower and water infrastructure

Way Forward (Analytical Insight)

• Address source-level pollution control in Bengaluru
• Ensure transparent environmental impact assessment (EIA)
• Strengthen inter-state dialogue mechanisms
• Balance development with ecological sustainability
• Strict compliance with CWC and environmental clearances

STATIC PART

Mekedatu Project

• River: Cauvery
• Location: Near Kanakapura, Karnataka (border with Tamil Nadu)
• Type: Balancing reservoir + multipurpose dam

Key Features:

• Storage: ~67 TMC
• Power generation: ~400 MW
• Purpose: Drinking water + hydropower

Cauvery River

• Origin: Talakaveri (Karnataka)
• Flows through: Karnataka → Tamil Nadu → Bay of Bengal
• Major tributary: Arkavathi

Central Water Commission (CWC)

• Established: 1945
• Ministry: Jal Shakti
• Headquarters: New Delhi
• Head: Chairman

Functions:

• Water resource planning & coordination
• Flood control, irrigation, hydropower
• Technical appraisal of projects (like DPR approval)

Karnataka Engineering Research Station (KERS)

• Role: Technical support for water resource projects
• Function in News: Leading implementation team for Mekedatu project

Updated - 27 March 2026; 08:34 AM | News Source: The Hindu,TOI ,The New Indian Express ,DH ,ETV Bharat