Mekedatu Dam Project

The Tamil Nadu Assembly has unanimously adopted a resolution opposing Karnataka's Mekedatu Dam Project across the Cauvery River, arguing that the project could affect downstream water availability. Karnataka, however, has expressed its willingness to hold discussions and maintains that the project will not reduce Tamil Nadu's allocated share of Cauvery waters.

About the Mekedatu Dam Project

The Mekedatu Dam Project is a proposed balancing reservoir on the Cauvery River in Ramanagara district of Karnataka, located near the Mekedatu gorge. A balancing reservoir is designed to store excess water during the monsoon and regulate river flows during lean seasons, thereby improving water management without significantly altering the river's overall allocation.

The project is intended to strengthen Karnataka's water infrastructure while ensuring regulated downstream releases to neighboring states.

Objectives of the Project

The primary objective of the project is to provide drinking water to Bengaluru and its surrounding regions, which are witnessing increasing water demand due to rapid urbanization and population growth.

Another important objective is to regulate the release of Cauvery waters to Tamil Nadu at Biligundlu, the interstate measuring point, thereby ensuring more systematic water management.

The project also aims to generate about 400 MW of hydroelectric power, contributing to Karnataka's renewable energy capacity.

Concerns Raised by Tamil Nadu

Tamil Nadu has strongly opposed the project, arguing that no new dam or storage structure should be constructed in the Cauvery Basin without the consent of all basin states—Tamil Nadu, Kerala, and Puducherry—as well as approval from the Union Government and other competent authorities.

The state fears that the reservoir may enable Karnataka to store additional water upstream, potentially affecting the timely release of water to downstream regions during periods of low rainfall, thereby impacting agriculture and drinking water needs in Tamil Nadu.

Supreme Court's Position

In November 2025, the Supreme Court declined to entertain Tamil Nadu's challenge at that stage. The Court observed that the proposal was still at the Detailed Project Report (DPR) stage and should first be examined by expert technical institutions such as the Cauvery Water Management Authority (CWMA) and the Central Water Commission (CWC) before any judicial intervention.

Cauvery (Kaveri) River

About

The Cauvery (Kaveri) River is one of the most important perennial rivers of South India and is popularly known as the "Ganga of the South" (Dakshin Bharat ki Ganga) because of its immense cultural, economic, and agricultural significance.

Origin and Course

The river originates at Talakaveri in the Brahmagiri Hills of the Western Ghats in Kodagu district, Karnataka. It flows for approximately 800 km in a south-easterly direction through Karnataka and Tamil Nadu before finally emptying into the Bay of Bengal near Poompuhar, forming a fertile delta region.

Major Tributaries

The left-bank tributaries of the Cauvery include Harangi, Hemavati, Shimsha, and Arkavati.

The right-bank tributaries include Lakshmana Tirtha, Kabini, Suvarnavathi, Bhavani, Noyyal, and Amaravati.

Major Dams

The river supports several important irrigation and hydropower projects. The two most significant dams are:

• Krishna Raja Sagara (KRS) Dam – Karnataka

• Mettur Dam (Stanley Reservoir) – Tamil Nadu

Importance

The Cauvery River is the lifeline of southern India, supporting millions of people through irrigation, drinking water supply, hydroelectric power generation, fisheries, and industry. It is also at the centre of the long-standing Cauvery Water Dispute among Karnataka, Tamil Nadu, Kerala, and Puducherry, making it one of India's most significant inter-state river basins from both developmental and legal perspectives