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On 17 August 2026 the Supreme Court directed Karnataka to comply with the Cauvery Water Management Authority's directions on releasing water to Tamil Nadu.
The CWMA had directed a daily release of 12,000 cusecs for the period 12 to 27 August 2026.
The bench of Justices Vikram Nath and Sandeep Mehta noted that flows from the Krishna Raja Sagar reservoir crossed 12,000 cusecs at Biligundlu by 8 a.m. on 17 August.
Tamil Nadu said it had received 14.814 TMC against an entitlement of 64 TMC, leaving a shortfall of about 20 TMC; Karnataka said it had exceeded the earlier 3,500-cusec mandate until 11 August.
The court sought a fresh status report from the CWMA and fixed the next hearing for 24 August 2026.
A cusec is one cubic foot of water flowing past a point every second — a rate. A TMC is one thousand million cubic feet — a volume. Directions to release water are written in cusecs per day because a river is regulated as a flow, while entitlements under the tribunal award are written in TMC because a season's share is a quantity. Tamil Nadu's grievance is stated in TMC (a shortfall against a seasonal entitlement) while Karnataka's compliance is stated in cusecs (a daily rate it maintained), which is why both states can be describing the same period accurately and still disagree.
Simple Analogy: Cusecs are the speed on the tap; TMC is how full the bucket is at the end of the month.
The Cauvery Water Disputes Tribunal is constituted under the Inter-State River Water Disputes Act, 1956
The Tribunal delivers its final award, allocating shares out of an assessed 740 TMC in a normal year
The Supreme Court modifies the award: Tamil Nadu 404.25 TMC, Karnataka 284.75 TMC (a rise of 14.75 TMC), Kerala 30 TMC, Puducherry 7 TMC; it also declares the Cauvery a national asset and directs a scheme
The Centre notifies the Cauvery Water Management Scheme, creating the Cauvery Water Management Authority and the Cauvery Water Regulation Committee
CWMA directs Karnataka to release 12,000 cusecs a day; the Supreme Court takes up compliance on 17 August
Statutory authority under the Cauvery Water Management Scheme, 2018; monitors storage, assesses availability and issues release directions
Technical committee under the same scheme that collects field data and advises the Authority on releases
Empowers Parliament to provide for adjudication of inter-state river water disputes and to bar the jurisdiction of courts; the Inter-State River Water Disputes Act, 1956 is the law made under it
Shared by Karnataka, Tamil Nadu, Kerala and Puducherry; the river rises at Talakaveri in the Brahmagiri hills of Kodagu, Karnataka, and drains into the Bay of Bengal
Krishna Raja Sagar in Karnataka and Mettur in Tamil Nadu are the storages whose levels drive every release dispute
Krishna, Godavari, Ravi-Beas, Mahadayi and Vansadhara are the other standing tribunal disputes examiners pair with the Cauvery
GS Paper 2 > Polity > Inter-state relations and dispute resolution mechanisms
General Awareness > Geography and Polity
General Awareness > Rivers of India
One cubic foot of water per second — a rate of flow
Thousand million cubic feet — a volume of water
The inter-state measuring point on the Cauvery at which releases from Karnataka to Tamil Nadu are gauged
Cauvery Water Management Authority, created under the Cauvery Water Management Scheme, 2018