The Supreme Court on Monday agreed to hear on August 13 a petition filed by the Tamil Nadu government seeking directions to Karnataka for the immediate release of its share of Cauvery water. A three-judge bench led by Chief Justice Surya Kant, with Justices Joymalya Bagchi and V. Mohana, listed the matter after taking note of submissions by counsel for Tamil Nadu that the state was not receiving its entitled allocation amid deficient rainfall.
Punjab-style listing and Tamil Nadu’s grievance
During the brief hearing, the bench said the petition would be taken up later this week.
“We will list it for hearing on Thursday,”the Chief Justice said. Tamil Nadu’s petition, filed on August 3, contends that both the quantum allocated by the Cauvery Water Regulation Committee (CWRC) and the actual releases from Karnataka are far below its due share.
The CWRC had directed Karnataka to release 3,500 cusecs of Cauvery water for a 15-day period starting July 29, a direction that was subsequently upheld by the Cauvery Water Management Authority (CWMA), Tamil Nadu’s petition states. Despite that, the state alleges water released at the inter-state point of Biligundlu varied between 158 and 550 cusecs from July 29 to August 2.
Reservoir levels in Karnataka and contested calculations
In a press release cited in the petition, the Tamil Nadu government said that as of August 3 the combined storage in four Karnataka reservoirs — Krishnarajasagar (KRS), Kabini, Harangi and Hemavathy — stood at 77.537 TMC. Based on recent rains in the KRS and Kabini catchments, Tamil Nadu said the proportionate quantity that should have been realised at Biligundlu was 26.954 TMC, while the CWMA had allocated only 4.536 TMC to the state.
The petition argues that Karnataka has “failed” to share the due proportion, and that the CWMA allocation was insufficient when compared with the volumes Tamil Nadu says are available within Karnataka reservoirs.
| Reservoirs (Karnataka) | Combined storage (as of Aug 3) |
|---|---|
| KRS, Kabini, Harangi, Hemavathy | 77.537 TMC |
| Proportionate expected at Biligundlu | 26.954 TMC |
| CWMA allocation to Tamil Nadu (contested) | 4.536 TMC |
Immediate context and prior moves
The case follows fresh rainfall in catchment areas of KRS and Kabini and a formal direction of the CWRC to Karnataka to release water. Tamil Nadu’s petition points to a wide gap between the directed release and the volumes it says reached the border at Biligundlu during the end of July and early August.
Separately, the DMK — the principal opposition in Tamil Nadu — had earlier moved the top court seeking directions to Karnataka for the immediate release of the due share. The litigation adds to a long history of Cauvery adjudication and regulatory interventions by bodies such as the CWRC and the CWMA.
Practical implications for Karnataka
The dispute carries direct implications for farmers, reservoir operations and water allocation policies in Karnataka. If the Supreme Court issues directions, Karnataka will be required to comply with any binding orders; conversely, the state may present data on inflows, reservoir conservation needs and downstream releases at the hearing. The petition’s assertions about storage and proportionate realisation place the spotlight on reservoir accounting methods and inter-state release mechanisms at Biligundlu.
- Court date: August 13, 2026
- Legal forum: Supreme Court bench of CJI Surya Kant and Justices Bagchi and V. Mohana
- Key figures cited by Tamil Nadu: 77.537 TMC (storage); 26.954 TMC (proportionate at Biligundlu); 4.536 TMC (CWMA allocation)
The hearing later this week will test competing technical claims on available water and the manner in which inter-state allocations and releases are monitored and enforced. Stakeholders in Bengaluru and other Karnataka districts dependent on these reservoirs will be watching for any court directions that could alter reservoir management in the coming weeks.
The Supreme Court listing also highlights persistent tensions over the Cauvery between Karnataka and Tamil Nadu — a long-standing issue that repeatedly draws judicial and administrative interventions whenever monsoon variability tightens the water balance across both states.
No comments from Karnataka officials were part of the material lodged in the petition cited by Tamil Nadu in the court filing.
