Karnataka faces fresh Cauvery squeeze as CWMA backs 12,000-cusec release to TN
The Cauvery Water Management Authority (CWMA) directed Karnataka to ensure a release of 12,000 cusecs of water per day at the Biligundlu gauging station to Tamil Nadu for a defined period.
The direction affirmed the recommendation of the Cauvery Water Regulation Committee (CWRC), Karnataka's technical sub-authority equivalent, rejecting Karnataka's request to reduce the release.
Karnataka cited severe hydrological stress, stating inflows into its four major Cauvery reservoirs were running well below the long-term average, and sought either deferral of the release or a reduction to a lower cusec figure.
Tamil Nadu maintained that Karnataka's stated water stress did not justify withholding its due share under the applicable tribunal award.
Karnataka's state government indicated it would review the order while balancing compliance with farmers' interests in the reservoir command areas.
Inter-State River Water Disputes — Constitutional and Statutory Framework (Article 262)
Article 262 of the Constitution empowers Parliament to legislate on the adjudication of disputes relating to waters of inter-state rivers or river valleys, and to bar the jurisdiction of the Supreme Court and other courts over such disputes if Parliament so provides. Under this power, Parliament enacted the Inter-State River Water Disputes Act, 1956, which provides for the constitution of ad hoc Water Disputes Tribunals to adjudicate disputes when direct negotiation between riparian states fails.
Key Details
- Article 262(2) allows Parliament to exclude the jurisdiction of the Supreme Court over such disputes, but in practice the Supreme Court has continued to hear disputes over implementation and interpretation of tribunal awards (e.g., the Cauvery matter reached the Supreme Court in 2018).
- The Inter-State River Water Disputes Act, 1956 (amended in 2002 and again via the Inter-State River Water Disputes (Amendment) Act, 2019, which envisaged a single standing tribunal with multiple benches) governs the tribunal process.
- River water is a State subject under Entry 17 of the State List, but inter-state rivers fall under Entry 56 of the Union List, creating the basis for central legislative involvement.
The CWMA's authority to direct Karnataka on daily release quantities flows from this constitutional-statutory chain — Article 262 enabling the 1956 Act, under which the Cauvery Water Disputes Tribunal was constituted and its award is now implemented.
Cauvery Water Disputes Tribunal (CWDT) Award, 2007 and Supreme Court Modification, 2018
The Cauvery Water Disputes Tribunal was constituted in 1990 under the Inter-State River Water Disputes Act, 1956, and delivered its final award in February 2007, allocating the waters of the Cauvery basin among the riparian states. The Supreme Court, in its 2018 judgment on cross-appeals against the award, modified the allocation, giving Karnataka a marginally larger share (accounting for Bengaluru's drinking water needs and reassessed groundwater availability in Tamil Nadu) while directing the Centre to constitute an implementing authority — leading to the creation of the CWMA.
Key Details
- CWDT Award (2007): total allocation of 740 TMC — Tamil Nadu 419 TMC, Karnataka 270 TMC, Kerala 30 TMC, Puducherry 7 TMC, and 14 TMC reserved for environmental protection/inevitable escapages to the sea.
- Supreme Court (2018): revised shares to approximately Tamil Nadu 404.25 TMC and Karnataka 284.75 TMC, adjusting for Karnataka's additional groundwater use for Bengaluru and reassessed groundwater availability in Tamil Nadu's delta.
- The 2018 judgment directed the Union Government to frame a scheme for implementation, resulting in the constitution of the Cauvery Water Management Authority (CWMA) and the Cauvery Water Regulation Committee (CWRC).
The current dispute over 12,000 cusecs is a monthly/fortnightly regulation decision made under this implementation scheme — the CWMA applying the 2018-modified tribunal award to real-time reservoir conditions.
Cauvery Water Management Authority (CWMA) and Cauvery Water Regulation Committee (CWRC)
The CWMA is a statutory, quasi-judicial authority notified by the Central Government under Section 6A of the Inter-State River Water Disputes Act, 1956, following the Supreme Court's 2018 directions. It is responsible for the day-to-day implementation and supervision of the water-sharing arrangement, operating under the Union Ministry of Jal Shakti and headquartered in New Delhi. The CWRC is its technical sub-committee, which makes fortnightly/monthly release recommendations based on rainfall, storage, and inflow data, which the CWMA then affirms or modifies.
Key Details
- CWMA composition: a Chairman and a Secretary (both Central Government appointees, typically senior IAS/engineering officers) plus eight members — two full-time and two part-time from the Centre, and one part-time member each from the four riparian states/UTs (Karnataka, Tamil Nadu, Kerala, Puducherry).
- The Biligundlu gauging station (on the Karnataka-Tamil Nadu border) is the standard measurement point for verifying compliance with release directions.
- The CWMA's directions are binding on the states but have periodically triggered political and farmer protests in both Karnataka's and Tamil Nadu's Cauvery basin districts.
The specific 12,000-cusec figure and the Biligundlu measurement point are exactly the operational mechanism established by the CWMA/CWRC framework to translate the 2018 Supreme Court-modified tribunal award into real-time water releases.
- CWDT final award: 2007 — total Cauvery basin allocation of 740 TMC.
- Supreme Court modification: 2018 — Tamil Nadu ~404.25 TMC, Karnataka ~284.75 TMC (net increase of 14.75 TMC to Karnataka).
- Constitutional basis: Article 262 (inter-state water disputes); statutory basis: Inter-State River Water Disputes Act, 1956 (Section 6A for CWMA notification).
- CWMA composition: Chairman + Secretary + 8 members (2 full-time and 2 part-time Centre members; remaining part-time members from Karnataka, Tamil Nadu, Kerala, Puducherry).
- CWMA headquartered in New Delhi, functions under the Union Ministry of Jal Shakti.
- Measurement/compliance point for the current release order: Biligundlu gauging station, on the Karnataka-Tamil Nadu border.
- River basin states covered: Karnataka, Tamil Nadu, Kerala, and the Union Territory of Puducherry.