Mekedatu Project: Key Facts

Project Overview

  • Type: Balancing reservoir across the Cauvery river
  • Location: Near Mekedatu in Ramanagara district, Karnataka (within Karnataka's territory)
  • Purpose: Regulate Cauvery river flows and improve water management

Main Objectives

  • Meet drinking water requirements of Bengaluru and surrounding areas
  • Regulate release of water to Tamil Nadu at Biligundlu
  • Generate 400 MW of hydroelectric power

Tamil Nadu's Stand

  • Tamil Nadu Assembly unanimously adopted a resolution opposing the project
  • Argues that no new dam or storage project should be constructed in the Cauvery basin without:
  • Consent of other basin states (Tamil Nadu, Kerala, and Puducherry)
  • Approval from the Union government and competent authorities

Supreme Court Ruling (November 2025)

  • Rejected Tamil Nadu's challenge at that stage
  • Observed that the issue was still at the Detailed Project Report (DPR) stage
  • Directed examination by expert bodies:
  • Cauvery Water Management Authority (CWMA)
  • Central Water Commission (CWC)

Cauvery (Kaveri) River: Important Facts

Overview

  • One of South India's most significant rivers
  • Often referred to as the "Ganga of the South" (Dakshin Bharat ki Ganga)

Geographical Details

  • Origin: Talakaveri in the Brahmagiri Range of the Western Ghats (Kodagu district, Karnataka)
  • Course: Flows approximately 800 km in a southeasterly direction through Karnataka and Tamil Nadu
  • Outfall: Empties into the Bay of Bengal near Poompuhar (Tamil Nadu)

Key Tributaries

Left Bank:

  • Harangi
  • Hemavati
  • Shimsha
  • Arkavati

Right Bank:

  • Lakshmana Tirtha
  • Kabini
  • Suvarnavathi
  • Bhavani
  • Noyyal
  • Amaravati

Major Dams

  • Krishna Raja Sagara (KRS) - Karnataka
  • Mettur Dam (Stanley Reservoir) - Tamil Nadu

Constitutional and Legal Framework

Relevant Articles

  • Article 262: Deals with adjudication of inter-state water disputes
  • Article 263: Provides for inter-state Council (though not specifically for water disputes)

Mechanisms

  • Cauvery Water Disputes Tribunal: Established under Article 262
  • Cauvery Water Management Authority (CWMA): Executive body to implement Tribunal's decisions
  • Central Water Commission (CWC): Technical body for water resource management

Supreme Court Judgment (2018)

  • Delivered a significant verdict on Cauvery water sharing between Karnataka and Tamil Nadu
  • Established the water allocation formula

Significance for India

Federalism Dimensions

  • Highlights the complexity of inter-state river water sharing in a federal structure
  • Tests the balance between riparian states' rights and national interest
  • Demonstrates the role of judicial intervention in resolving water disputes

Policy Implications

  • Need for comprehensive water management policies
  • Balancing urban water needs (Bengaluru) with agricultural requirements (Tamil Nadu)
  • Climate change impact on water availability

Inter-State Relations

  • Karnataka's position: Project within its territory, won't affect Tamil Nadu's allocated share
  • Tamil Nadu's position: Principle of prior consent for basin states
  • Role of Union government in mediating disputes

Key Data Points to Remember

  • River length: ~800 km
  • Hydroelectric power generation: 400 MW
  • States through which river flows: Karnataka, Tamil Nadu
  • Basin states: Karnataka, Tamil Nadu, Kerala, Puducherry
  • Number of major tributaries: 8 (4 left bank, 4 right bank)