Direct Karnataka to release backlog of 17.604 tmcft Cauvery water: T.N. to Supreme Court
Tamil Nadu approached the Supreme Court seeking a direction to Karnataka to release an accumulated backlog of 17.604 tmcft (thousand million cubic feet) of Cauvery water, in addition to current-season releases.
Tamil Nadu submitted that farmers in the Cauvery Delta region are severely affected due to non-receipt of their due share of water for irrigation.
Tamil Nadu contended that the Cauvery Water Regulation Committee (CWRC) and the Cauvery Water Management Authority (CWMA) failed to account for the accumulated shortfall while fixing recent release schedules.
The Supreme Court is scheduled to hear the matter on August 31.
Article 262 and the Inter-State River Water Disputes Act, 1956
Article 262 of the Constitution empowers Parliament to legislate on the adjudication of disputes relating to waters of inter-State rivers, and to bar the jurisdiction of the Supreme Court and other courts over such disputes. Parliament exercised this power by enacting the Inter-State River Water Disputes Act, 1956.
Key Details
- Article 262(1) allows Parliament to provide for adjudication mechanisms; Article 262(2) allows Parliament to exclude the jurisdiction of the Supreme Court and other courts over such disputes.
- Under Section 11 of the 1956 Act, courts (including the Supreme Court) generally cannot exercise original jurisdiction over inter-State river disputes once a tribunal is constituted.
- However, the Supreme Court's Special Leave Petition (SLP) jurisdiction under Article 136 is not barred by Section 11 — a position affirmed by the Supreme Court in its February 2018 Cauvery judgment — which is why Tamil Nadu can still approach the Court on implementation/compliance grievances.
- Water is a State subject under Entry 17 of the State List, but regulation of inter-State rivers falls under Entry 56 of the Union List, creating the constitutional basis for central tribunals and authorities.
Tamil Nadu's approach to the Supreme Court — rather than only to CWMA — relies on this residual Article 136 jurisdiction, since the dispute concerns Karnataka's alleged non-compliance with existing tribunal-based allocations rather than a fresh adjudication of shares.
Cauvery Water Disputes Tribunal (CWDT) Award and the 2018 Supreme Court Verdict
The CWDT was constituted in 1990 under the 1956 Act and delivered its final award in 2007, allocating the Cauvery basin's water among Karnataka, Tamil Nadu, Kerala and Puducherry. The Supreme Court modified this award in its February 2018 judgment.
Key Details
- The 2018 Supreme Court verdict increased Karnataka's share by 14.75 tmcft (largely to meet Bengaluru's drinking water needs) while correspondingly reducing Tamil Nadu's allocation, while keeping the overall basin yield assumption largely intact.
- The Tribunal/Court-mandated framework specifies monthly release schedules from Karnataka's reservoirs to Tamil Nadu's Biligundlu gauge station, based on a normal (100%) water year; shortfalls trigger proportionate distress-sharing formulas.
- The 2018 judgment directed the Central Government to frame a scheme (leading to the CWMA and CWRC) for implementing the award, since the earlier tribunal mechanism had no dedicated implementing authority.
The 17.604 tmcft backlog Tamil Nadu is claiming is measured against these tribunal/Court-mandated monthly release schedules — the core of the current dispute is whether Karnataka met its cumulative release obligation over preceding months, not the validity of the shares themselves.
Cauvery Water Management Authority (CWMA) and Cauvery Water Regulation Committee (CWRC)
The CWMA and CWRC were constituted in June 2018 under the Cauvery Water Management Scheme, notified under Section 6A of the Inter-State River Water Disputes Act, 1956, as the implementing and monitoring authorities for the 2018 Supreme Court-modified award.
Key Details
- CWMA is a statutory, quasi-judicial body with a nine-member structure — a Chairperson (Secretary-rank Government of India officer), two Central Government members, and one representative each from Karnataka, Tamil Nadu, Kerala and Puducherry.
- CWRC is the technical/operational arm that issues day-to-day and monthly water release directions to the party states based on rainfall, reservoir storage, and the Tribunal's distress-sharing formula.
- CWMA decisions can be reviewed/appealed to the Supreme Court, which retains supervisory jurisdiction over the scheme's implementation.
- This two-tier structure (CWRC for operational directions, CWMA for policy/appellate oversight) is the model now used as a reference for other inter-State river management proposals.
Tamil Nadu's grievance is precisely that CWRC's operational release orders and CWMA's review of them did not factor in the cumulative backlog, prompting Tamil Nadu to bypass further administrative appeal and approach the Supreme Court directly for a compliance direction.
- Backlog claimed by Tamil Nadu: 17.604 tmcft (thousand million cubic feet).
- CWDT constituted: 1990; Final Award: 2007; Supreme Court modification: February 2018 (Karnataka's share increased by 14.75 tmcft).
- CWMA and CWRC constituted: June 2018, under Section 6A of the Inter-State River Water Disputes Act, 1956.
- CWMA composition: 9 members (Chairperson + 2 Central members + 4 State/UT representatives from Karnataka, Tamil Nadu, Kerala, Puducherry).
- Supreme Court hearing on the current backlog plea: August 31.
- Constitutional basis: Article 262 (inter-State river disputes) and Entry 56, Union List (regulation of inter-State rivers).