The Mekedatu Dam Issue: An Old Cauvery Quarrel Returns

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Relevance: GS-II Federalism & Union–State Relations · GS-III Water Resources

Source: TN Assembly resolution, June 2026

1 · What happened

On 19 June 2026, the Tamil Nadu Assembly unanimously passed a resolution — moved by Chief Minister C. Joseph Vijay — opposing Karnataka’s plan to build the Mekedatu dam on the Cauvery River.

The House urged the Centre to deny all clearances to the project and to set up a new tribunal to settle the dispute. It’s the latest flare-up in one of India’s oldest river quarrels — between Karnataka (upstream) and Tamil Nadu (downstream).

2 · What is the Mekedatu project?

Mekedatu (“goat’s leap”) is a deep gorge in Ramanagara district, Karnataka, where the Cauvery meets its tributary the Arkavathi, close to the Tamil Nadu border. Karnataka wants to build a “balancing reservoir” there — a dam to store surplus water and release it in a controlled way.

Cost: nearly ₹9,000 crore.
Purpose: mainly to secure drinking water for the Bengaluru region, plus about 400 MW of hydro-power.

3 · The clash — and where it stands

Karnataka’s case “It only stores surplus” Karnataka says it will only catch water that would otherwise flow waste into the sea, won’t cut Tamil Nadu’s settled share, and is vital for Bengaluru’s drinking water.	Tamil Nadu’s fear “Our farmers will suffer” The Cauvery is a deficit basin — its water is already fully shared. A new upstream dam, TN says, threatens flow to its Mettur dam and the delta’s farmers.
The rulebook Consent is needed The 2007 tribunal award and the 2018 Supreme Court judgment held that, in a deficit basin, no new project can come up without all basin states agreeing.	Where it stands Still on paper The project is at the DPR (Detailed Project Report) stage under Central review. In May 2026 the Supreme Court dismissed TN’s plea as “premature.”

4 · The constitutional backdrop

Who controls water: “Water” is a State subject (Entry 17, State List) — but this is subject to the Union’s power over inter-state rivers (Entry 56, Union List).
How disputes are settled: Article 262 lets Parliament make laws to adjudicate inter-state river disputes — and even bar the courts. Under it, the Inter-State River Water Disputes (ISRWD) Act, 1956 allows the Centre to set up a tribunal.
The watchdog: the Cauvery Water Management Authority (CWMA), set up in 2018, oversees the sharing of Cauvery water among Karnataka, Tamil Nadu, Kerala and Puducherry.

UPSC Value Box

Mekedatu	Gorge at the Cauvery–Arkavathi confluence in Ramanagara, Karnataka; site of the proposed balancing reservoir.
Riparian states	States along a river: upstream (Karnataka) and downstream (Tamil Nadu, Puducherry); Kerala is also a basin state.
Article 262	Lets Parliament legislate on inter-state river disputes and bar court jurisdiction.
Entry 17 vs Entry 56	Water is in the State List (17), subject to the Union’s power over inter-state rivers (56).
ISRWD Act, 1956	Inter-State River Water Disputes Act; lets the Centre refer a dispute to a tribunal (Section 4).
CWDT / 2018 SC verdict	Cauvery Tribunal award (2007); SC modified shares in 2018 (TN ≈ 177 TMC).
CWMA	Cauvery Water Management Authority (2018); implements the water-sharing order.

MCQ Practice Question

Q. With reference to inter-state river water disputes in India, consider the following statements:

Article 262 empowers Parliament to provide for the adjudication of inter-state river water disputes and to bar the jurisdiction of the Supreme Court in such matters.
“Water” is in the State List (Entry 17), but subject to the Union’s power over inter-state rivers under Entry 56 of the Union List.
The Inter-State River Water Disputes Act, 1956 was enacted under Article 263 of the Constitution.

Which of the statements given above is/are correct?
(a) 1 and 2 only (b) 2 and 3 only (c) 1 and 3 only (d) 1, 2 and 3

Answer: (a) 1 and 2 only

Statement 1 — Correct: Article 262 allows Parliament to legislate on such disputes and to exclude the courts.
Statement 2 — Correct: Water is a State subject (Entry 17), subject to the Union’s power over inter-state rivers (Entry 56).
Statement 3 — Incorrect (the trap): The ISRWD Act, 1956 was enacted under Article 262, not Article 263. (Article 263 deals with the Inter-State Council — a common mix-up.)

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