Cauvery-Mekedatu Dispute & Article 262: Water Federalism | CLAT

CURRENT AFFAIRS | 31 JULY 2026

The century-old Cauvery water dispute between Karnataka and Tamil Nadu has flared once more. The Centre has returned Karnataka’s Detailed Project Report (DPR) for the proposed Mekedatu balancing reservoir, noting that Karnataka has not secured the required clearances and must route the project through the Cauvery Water Management Authority. The Union government has also clarified that the Supreme Court’s 2018 Cauvery verdict does not mandate prior consent of downstream states, even as Tamil Nadu continues to oppose the dam. On 31 July 2026, political protests were planned in Karnataka over the latest twist.

For a CLAT aspirant, the Cauvery–Mekedatu row is one of the finest live illustrations of Indian federalism and the special constitutional machinery for water disputes. It brings together Article 262, the Union–State division of legislative power over water, and the ouster of the Supreme Court’s ordinary jurisdiction. Let us map it out.

Water in the constitutional scheme

Water is primarily a State subject. Entry 17 of the State List (List II) covers “water, that is to say, water supplies, irrigation and canals, drainage and embankments, water storage and water power.” But there is a crucial rider: this is “subject to the provisions of Entry 56 of the Union List (List I)”, which empowers Parliament to regulate and develop inter-State rivers and river valleys in the public interest. So while a state controls water within its own territory, the moment a river crosses state boundaries, the Union can step in. The Cauvery, flowing through Karnataka, Tamil Nadu, Kerala and Puducherry, is precisely such an inter-State river.

The Cauvery timeline

The modern dispute was referred to the Cauvery Water Disputes Tribunal (CWDT), constituted in 1990. The Tribunal delivered its final Award in 2007, allocating the river’s waters among the basin states. When that Award was challenged, the Supreme Court — despite Article 262(2) — heard appeals (invoking its powers under Article 136) and delivered a significant verdict on 16 February 2018. It modestly re-adjusted the allocations (raising Karnataka’s share and reducing Tamil Nadu’s), declared the Cauvery a “national asset,” and directed the Centre to set up a Cauvery Water Management Authority (CWMA) to implement the Award. The 2018 verdict also upheld Clause XVIII of the 2007 Award, which affirms that a state may regulate water use within its boundaries so long as it is not inconsistent with the Tribunal’s directions.

Mekedatu and the DPR standoff

Karnataka wants to build a balancing reservoir at Mekedatu (near the Karnataka–Tamil Nadu border) to store surplus monsoon water and supply drinking water to Bengaluru, while also generating power. Tamil Nadu fiercely opposes it, fearing reduced downstream flows. Karnataka submitted a DPR in 2019; the Central Water Commission returned it, citing technical issues and Tamil Nadu’s objections. The Centre’s current position, reiterated in 2026, has two prongs: first, that the 2018 Supreme Court verdict does not require prior consent of lower riparian states for structures across the Cauvery; but second, that any Mekedatu project must nonetheless obtain the approval of the CWMA and conform to the Tribunal’s Award before the Jal Shakti Ministry can consider it. In effect, no consent clause — but no green light either, until the Authority clears it.

Why courts keep hearing a “barred” dispute

A puzzle worth resolving is this: if Article 262(2) and the 1956 Act oust the courts, how did the Supreme Court deliver a Cauvery verdict in 2018 at all? The answer lies in a distinction the Court itself has drawn. The bar operates against fresh original suits over the merits of a notified dispute — a state cannot bypass the tribunal and sue directly. But the Supreme Court has held that its own constitutional powers, notably the discretionary appellate jurisdiction under Article 136 (special leave) and its role in ensuring tribunals act within the law, are not so easily excluded. Framing its intervention as an appeal against the Tribunal’s Award rather than a fresh dispute, the Court found room to hear and modify the 2007 Award in 2018. This nuance — a statutory ouster that does not fully close the constitutional door — is exactly the sort of subtlety a strong CLAT candidate is expected to grasp.

Federalism under strain

River water disputes are among the sharpest tests of Indian federalism because rivers do not respect political boundaries, and states have every electoral incentive to fight for “their” water. The Cauvery row shows both faces of federalism: the competitive face, where states litigate and agitate against one another; and the cooperative face, where the Union sets up neutral tribunals and authorities to mediate. The constitutional design — a State subject overridden by Union control of inter-State rivers, adjudicated by a tribunal insulated from the courts — reflects the framers’ foresight that water would be a perennial flashpoint requiring a specialised mechanism.

What to watch

The immediate question is procedural: whether Karnataka submits a revised DPR and secures CWMA approval, and how Tamil Nadu responds politically and legally. The deeper question is jurisprudential: how the Article 262 architecture — tribunalisation plus judicial ouster — coexists with the Supreme Court’s continuing willingness to hear Cauvery matters on appeal. For students, the Cauvery–Mekedatu saga is the perfect case study to internalise how the Constitution allocates a scarce natural resource between competing states and between the judiciary and specialised tribunals.