Inter-State Water Disputes — Article 262, IRWD Act 1956, Tribunals & Recent Disputes

Cross-paper relevance

• GS2 — Core: Article 262 federal dispute-resolution mechanism; IRWD Act 1956; tribunal system; cooperative federalism in practice; ISRWD Amendment Bill 2019 (lapsed 2024); Cauvery/Mahadayi/Mahanadi recent developments
• GS3 — Environmental dimension: Mahadayi river diversion vs Western Ghats ecology; river as national asset (Cauvery 2018 SC); climate change altering hydrology and river-flow estimates; Narmada development vs downstream impact
• Essay — Recurring themes: "Water as the next flashpoint of inter-state conflict"; "Cooperative federalism in India — aspirations and reality"; "River linking — panacea or Pandora's box"

Overview

Water is a State subject (Entry 17, State List) but rivers flowing through multiple states create disputes that require a national adjudication framework. Article 262 of the Constitution confers this power on Parliament, and Parliament enacted the Inter-State River Water Disputes Act, 1956 to operationalise it.

Constitutional Framework — Article 262

Article 262 is a federal conflict resolution mechanism and is an exception to the Supreme Court's general original jurisdiction under Article 131. Under Section 11 of the Inter-State River Water Disputes Act, 1956, the jurisdiction of courts (including the Supreme Court under Article 131) is barred once a tribunal is constituted. However, the Supreme Court's appellate jurisdiction under Article 136 (Special Leave Petition) is not barred — confirmed authoritatively in the Cauvery SC judgment (February 2018), which held that Section 11 of the IRWD Act cannot oust Article 136 jurisdiction. States can and do challenge tribunal awards via SLP before the Supreme Court.

UPSC Distinction (Article 131 vs Article 136): Once an IRWD tribunal exists, Art 131 original jurisdiction is excluded for that dispute. But Art 136 SLP jurisdiction survives — the SC acts in appellate capacity. A common Prelims trap: "Tribunal awards are final and cannot be challenged" — this is incorrect; SLPs are maintainable (Cauvery 2018).

Supporting Legislation

Major Inter-State Water Dispute Tribunals

Key status distinction: Awards of Krishna-I, Godavari, Narmada, Cauvery, and Mahadayi Tribunals are gazetted and effective. Awards of Ravi-Beas, KWDT-II, and Vansadhara are not yet notified (Ravi-Beas: review petition pending since 1987; KWDT-II: SC stay on gazette; Vansadhara: Centre has not notified). KWDT-II is additionally operating under fresh Terms of Reference (October 2023) for Telangana-AP reallocation.

UPSC Prelims trap: Maharashtra's KWDT-I allocation is 560 TMC (not 585 or 600 TMC); total 2060 TMC at 75% dependability (AP 800 + Karnataka 700 + Maharashtra 560).

Cauvery Dispute — Recent Developments (2024–2026)

The Cauvery dispute is the most politically charged inter-state water dispute in India.

The Cauvery SC Judgment (February 2018) — Three Landmark Holdings:

1. Cauvery declared a "national asset" — no state has proprietary rights over the river's waters; equitable apportionment is the governing principle (not prior appropriation)
2. Revised allocations: TN 404.25 TMC (unchanged from tribunal); Karnataka 284.75 TMC (raised from tribunal's 270 TMC — 14.75 TMC additional for Bengaluru drinking water); Kerala 30 TMC; Puducherry 7 TMC
3. Article 136 SLP jurisdiction survives the IRWD Act bar — the SC can hear SLPs against tribunal awards despite Section 11's ouster clause; the SC thus acts in appellate capacity (this overrules earlier understanding that tribunal awards were "truly final")

Post-2018 CWMA Framework:

• The Cauvery Water Management Authority (CWMA) was constituted on 1 June 2018 under Section 6A of the IRWD Act to implement the SC's modified award
• The Cauvery Water Regulation Committee (CWRC) was also constituted to regulate monthly water releases
• In August 2023, TN requested Karnataka to release 24,000 cusecs/day; Karnataka refused citing water shortage — the matter went back to CWMA and eventually the SC
• CWMA directive (May 2025): Ordered Karnataka to release 9.19 TMC from Biligundlu reservoir to Tamil Nadu's Mettur Dam for the month of June, ahead of the traditional kuruvai crop-season opening of Mettur sluices on 12 June 2025 (PIB / CWMA, May 2025)

Ongoing Suit:

• In March 2024, the SC framed 8 issues in Karnataka's original suit against TN, Kerala, and Puducherry, directing parties to file documents within six weeks. The suit tests whether Karnataka can claim "Karnataka Cauvery Water" beyond the 2018 award based on updated hydrological data and post-2018 developments.

UPSC angle: Prelims — CWMA constituted 1 June 2018; SC 2018 three holdings (national asset, revised allocations, Art 136 survives); 8 issues framed March 2024. Mains — why does the Cauvery dispute persist despite a final SC award? Evaluate CWMA's effectiveness and the tension between Article 262's ouster clause and Article 136 SLP jurisdiction.

Mahadayi Dispute

The Mahadayi (or Mandovi) river originates in Karnataka and flows through Goa to the Arabian Sea:

• Karnataka sought diversion of water to drought-prone Hubli-Dharwad-Gadag-Belagavi districts for drinking water (the Kalasa-Banduri project)
• Goa opposed any diversion, citing ecological sensitivity of the Western Ghats
• 2018 Tribunal Award allocations: Goa 24 TMC; Karnataka 13.42 TMC (5.5 TMC consumptive use, of which 3.9 TMC exportable outside the basin through Kalasa and Banduri nalas to Malaprabha river for drinking water + 8.02 TMC for hydro-power generation); Maharashtra 1.33 TMC
• The award was contested before the Supreme Court by Goa and Maharashtra; proceedings continued in 2024–2025
• Kalasa-Banduri project (Karnataka): still stalled as of May 2026 — environmental clearance and National Board for Wildlife (NBWL) approvals remain pending (delayed at 77th, 79th, 80th NBWL meetings)

Recent Developments (2024–2026)

Cauvery — SC Framed 8 Issues in Karnataka's Suit (March 2024)

In March 2024, the Supreme Court framed 8 issues in Karnataka's original suit against Tamil Nadu, Kerala, and Puducherry on Cauvery water use, directing parties to file documents within six weeks. The suit tests whether Karnataka can separately claim "Karnataka Cauvery Water" beyond the SC's 2018 modified award (which allocated 404.25 TMC to Tamil Nadu and 284.75 TMC to Karnataka, with Kerala and Puducherry receiving smaller allocations). Karnataka seeks to challenge the framework by arguing that the allocation should be reformulated based on updated hydrological data and post-2018 developments.

UPSC angle: Prelims — 8 issues framed March 2024; CWMA constituted 1 June 2018; SC's 2018 award. Mains — why does the Cauvery dispute persist despite a final award? Evaluate the limitations of the tribunal system and the CWMA in ensuring compliance.

Mahadayi Dispute — Kalasa-Banduri Stalled; Goa Files Contempt Petition (2024–2026)

The 2018 Mahadayi Tribunal award allocated Karnataka 13.42 TMC total (5.5 TMC consumptive use including 3.9 TMC exportable via Kalasa-Banduri nalas; 8.02 TMC for hydro-power). Karnataka's Kalasa-Banduri Nala Diversion Project — aimed at diverting 3.9 TMC to Malaprabha river for drinking water supply to Hubli-Dharwad-Gadag-Belagavi — remained stalled as of May 2026 due to: (a) pending forest clearance; (b) pending NBWL clearance (delayed at multiple NBWL meetings); (c) Goa's challenge before the SC.

New: Goa's contempt petition (2025–2026): Goa filed a contempt petition in the Supreme Court against Karnataka, alleging that Karnataka was already diverting Mahadayi water through the Kalasa-Banduri project in violation of the tribunal award and pending SC proceedings. The Supreme Court directed a Joint Monitoring Committee (comprising members from all three states — Goa, Karnataka, Maharashtra) to visit the project sites and submit a report on the alleged contempt. As of May 2026, the Joint Monitoring Committee's report is awaited and the contempt petition is sub-judice before the SC.

UPSC angle: Prelims — Award August 2018; Karnataka 13.42 TMC (5.5 TMC consumptive, 3.9 TMC exported via Kalasa-Banduri, 8.02 TMC hydro-power); Goa contempt petition pending (SC, 2025–26); Joint Monitoring Committee directed to report on alleged diversion. Mains — tension between upper-riparian development rights and downstream ecological protection; NBWL's role in inter-state water projects in ecologically sensitive zones; contempt jurisdiction as a federal enforcement tool.

Mahanadi Dispute — Deadline Lapsed; Tribunal Extended to January 2027

The Mahanadi Water Disputes Tribunal (constituted 2018) saw a significant change: Justice A.M. Khanwilkar resigned in March 2024, and the tribunal is now chaired by Justice Bela M. Trivedi (sitting SC judge). The tribunal conducted ground assessment visits to key infrastructure including Hirakud Dam (Odisha). The tribunal had set a final settlement deadline of May 2026 — but both Odisha and Chhattisgarh failed to produce a mutually agreed water-sharing formula by the deadline. The tribunal expressed dissatisfaction over frequent adjournments and the absence of substantive proposals. Following a joint request from both states, the Centre extended the tribunal's tenure by 9 months to 13 January 2027 (Ministry of Jal Shakti gazette notification, 10 April 2026). With most technical assessments and field-data collection completed, a final verdict is expected in early 2027.

Core dispute: Odisha alleges Chhattisgarh's upstream storage structures (barrages, reservoirs) in the upper Mahanadi are reducing downstream flows critical for agriculture and the Hirakud reservoir. Chhattisgarh argues its structures are within legal rights and that no inter-state agreement governs Mahanadi usage.

UPSC angle: Prelims — Mahanadi Tribunal (2018); chaired by Justice Bela M. Trivedi (post-2024); Odisha v. Chhattisgarh; tenure extended to 13 January 2027 (gazette 10 April 2026). Mains — contrast Mahanadi (new upstream infrastructure dispute) with Cauvery (historic allocation reinterpretation): how does the nature of the dispute shape the scope of tribunal remedies?

Ravi-Beas (SYL Canal) — SC Direction (May 2025)

The Sutlej-Yamuna Link (SYL) canal — a 214-km canal (122 km in Punjab, 92 km in Haryana) — was to carry Punjab's share of Ravi-Beas water to Haryana. Punjab never completed its 122-km stretch. The SC on 6 May 2025 (bench: Justices B.R. Gavai and Augustine George Masih) directed Punjab and Haryana to cooperate with the Centre for an amicable resolution; next hearing scheduled 13 August 2025. Key background: available Ravi-Beas water estimated at 17.17 MAF in 1981, dropped to 13.38 MAF by 2013 — Punjab contests the allocation formula based on updated hydrology. The Ravi-Beas Tribunal's Eradi report (1987) remains the only report submitted; the award was never gazetted because Punjab filed a review petition in August 1987 which remains pending.

UPSC angle: Prelims — SYL canal; Ravi-Beas Tribunal 1986 (Eradi); review petition pending since 1987; SC direction 6 May 2025. Mains — inter-state water disputes and the limits of tribunal-based resolution; role of political negotiation and the Centre as mediator.

Narmada — 45-Year Review Clause Now Operative (December 2024)

The Narmada Water Disputes Tribunal's award (gazetted 12 December 1979) included a 45-year review clause — any party may seek review of certain parameters after 45 years from the gazette date. This clause became operative in December 2024 (12 December 2024 = 45 years). Reviewable parameters include: FRL (Full Reservoir Level) and MWL (Maximum Water Level) of Sardar Sarovar Dam; sharing of costs and benefits; regulated releases by MP to Gujarat; payment obligations between Gujarat and MP. As of May 2026, no state has formally invoked the review clause before a tribunal or the Central Government.

UPSC angle: Prelims — NWDT award gazetted 12 December 1979; 45-year clause became active December 2024. Mains — significance of the review clause as a mechanism to adapt static allocations to changing hydrology and development needs; procedural gap — there is no tribunal mechanism currently notified to handle the review.

Challenges and Reform Proposals

Key Points for UPSC

• Article 262(1) — Parliament may provide for adjudication of inter-state river water disputes; Article 262(2) — Parliament may bar Supreme Court/High Court jurisdiction
• Article 131 (original jurisdiction) is barred once an IRWD tribunal is constituted for that dispute; Article 136 (SLP) is NOT barred — Cauvery 2018 SC confirmed appellate jurisdiction survives
• Water is a State subject (List II, Entry 17) but Parliament regulates inter-state rivers under Entry 56, Union List (regulation in public interest — limited power, not absolute)
• Section 9A, IRWD Act — Central Government must maintain a data bank for each inter-state river basin; states must supply hydrological data
• Awards of 5 tribunals (Krishna-I, Godavari, Narmada, Cauvery, Mahadayi) are gazetted and binding; awards of 3 (Ravi-Beas, KWDT-II, Vansadhara) remain not notified
• KWDT-I Maharashtra allocation: 560 TMC (not 585 TMC); total 2060 TMC (AP 800 + Karnataka 700 + Maharashtra 560)
• CWMA and CWRC constituted 1 June 2018 under Section 6A of the IRWD Act to implement the Cauvery SC 2018 award
• The River Boards Act, 1956 has never been operationalised — no River Board has ever been constituted
• ISRWD Amendment Bill 2019 proposed single permanent tribunal + DRC mediation; lapsed June 2024 — as of May 2026, the ad hoc tribunal system under the unamended 1956 Act continues
• Narmada 45-year review clause: active from December 2024 — reviewable parameters include Sardar Sarovar FRL, costs-benefits sharing, regulated releases
• Mahanadi Tribunal: chaired by Justice Bela M. Trivedi (post March 2024); May 2026 settlement deadline lapsed; tenure extended to 13 January 2027 (gazette 10 April 2026); verdict expected early 2027

UPSC Mains PYQs — Verified Deep Links

• GS2 2013 Q21 — Constitutional mechanisms to resolve inter-state water disputes have failed to address and solve the problems. Is the failure due to structural or process inadequacy or both? Discuss. (10M)