On 8 September 2026, the Cauvery Water Regulation Committee (CWRC) directed Karnataka to ensure flow of 6,000 cusecs daily for 15 days, starting from 9 September. The Cauvery Water Management Authority (CWMA) later upheld the direction.

Why in the News?

  • The Cauvery Water Management Authority (CWMA) has upheld the CWRC’s direction requiring Karnataka to release 6,000 cusecs of water per day to Tamil Nadu for 15 days.
  • Karnataka had challenged the order, citing severe drought and inadequate rainfall prospects.
  • Karnataka is considering approaching the Supreme Court against the decision.
  • The order triggered protests by farmers in Mandya, a major Cauvery basin region.

About the Cauvery River

  • Origin: Talakaveri, Brahmagiri Hills, Karnataka.
  • Length: About 805 km.
  • States/UT: Karnataka, Tamil Nadu, Kerala and Puducherry.
  • Outflow: Bay of Bengal.

Major Tributaries

  • Left Bank: Harangi, Hemavathi, Shimsha, Arkavathi.
  • Right Bank: Kabini, Bhavani, Noyyal, Amaravathi.

About Cauvery Water Management Authority (CWMA)

  • Established in 2018 under the Ministry of Jal Shakti.
  • Created following the Supreme Court’s 2018 judgment on Cauvery water sharing.
  • Main functions:
    • Supervise reservoir operations.
    • Monitor implementation of water-sharing arrangements.
    • Ensure compliance with the prescribed sharing mechanism.

Cauvery Water Regulation Committee (CWRC)

  • Functions under the CWMA.
  • Monitors:
    • Reservoir storage
    • Rainfall
    • River inflows
  • Makes recommendations regarding water releases among basin States.

Why is the Issue Controversial?

The issue is controversial because both Karnataka and Tamil Nadu depend heavily on the same river, but they have different water needs.

Karnataka’s Position

  • Karnataka argues that it is facing severe drought and water shortage.
  • It maintains that further releases would put pressure on its own reservoirs and water requirements.
  • The State has questioned decisions being taken by central monitoring bodies without adequately considering ground-level conditions.

Tamil Nadu’s Position

  • Tamil Nadu depends heavily on Cauvery flows for its downstream water requirements, particularly agriculture.
  • It seeks adherence to the established water-sharing arrangement.
  • Thus, the dispute reflects the broader challenge of balancing: Upstream State’s water availability + Downstream State’s entitlement.

Mekedatu Project

  • Proposed by Karnataka on the Cauvery near Mekedatu.
  • Objectives:
    • Supply drinking water to Bengaluru.
    • Generate hydroelectric power.
  • Tamil Nadu opposes the project, arguing that it could affect downstream water availability and the existing water-sharing arrangement.

Constitutional & Legal Framework

India’s constitutional and legal framework is a sophisticated system rooted in the Constitution of India, which serves as the supreme law of the land and establishes the foundation for governance, rights, duties, and justice.

Article 262

  • Provides for Parliament to make laws regarding adjudication of disputes relating to inter-State rivers and river valleys.

Inter-State River Water Disputes Act, 1956

  • Provides a framework for resolving inter-State river water disputes, including through tribunals.

Supreme Court Judgment, 2018

In 2018, the Supreme Court of India delivered several landmark judgments that significantly reshaped personal liberty, privacy, equality, and fundamental rights, strengthening constitutional protections and reaffirming the principles of justice, dignity, and individual freedom in India.

  • Modified the Cauvery Water Disputes Tribunal award.
  • Directed the creation of the Cauvery Water Management Authority to implement the water-sharing framework.

Key Challenges

  • Erratic monsoon: Variable rainfall directly affects reservoir storage and river flows.
  • Competing State demands: Agricultural, drinking-water and power requirements differ across basin States.
  • Upstream–downstream conflict: Reservoir control remains a politically sensitive issue.
  • Climate variability: Increasing rainfall uncertainty can intensify water disputes.
  • Political mobilisation: Water releases frequently trigger protests and regional sentiments.

Way Forward

  • Follow scientific, real-time assessment of rainfall, reservoir storage and inflows.
  • Strengthen basin-level water management rather than State-centric approaches.
  • Improve coordination between CWMA, CWRC and basin States.
  • Promote water-use efficiency, particularly in agriculture.
  • Develop long-term strategies for drought years instead of relying mainly on ad-hoc release orders.

Conclusion

The Cauvery water dispute between Karnataka and Tamil Nadu has again come into focus over the sharing of river water. The Cauvery Water Regulation Committee (CWRC) directed Karnataka to release 6,000 cusecs of water per day to Tamil Nadu for 15 days from September 9, 2026. The decision was later upheld by Cauvery Water Management Authority (CWMA). Tamil Nadu needs the water mainly for irrigation in the Cauvery delta region, along with drinking water requirements. Karnataka, however, has opposed the order, saying that the State is facing water stress and reduced inflows in the Cauvery basin. Karnataka has also indicated that it may approach the Supreme Court against the decision. The Cauvery dispute is a long-standing inter-State water-sharing issue involving Karnataka, Tamil Nadu, Kerala and Puducherry. It highlights the challenge of sharing river water between States, especially during periods of low rainfall and water scarcity.