CWMA endorses CWRC’s direction to Karnataka to release 12,000 cusecs of water a day for 15 days to Tamil Nadu
The Cauvery Water Management Authority (CWMA) affirmed and endorsed a recommendation of the Cauvery Water Regulation Committee (CWRC), directing Karnataka to release 12,000 cusecs of water per day to Tamil Nadu at the Biligundlu gauging station for 15 days.
The order followed reports that actual flow at Biligundlu had fallen well short of the previously stipulated release level over preceding days.
Karnataka cited hydrological distress, stating that inflows into its four major Cauvery reservoirs were running well below the long-term average, while the CWMA assessed the state's storage position as adequate to comply.
The decision was taken at a scheduled meeting of the CWMA, which reviewed both states' positions before ratifying the CWRC's technical recommendation.
Cauvery Water Management Authority (CWMA) and Cauvery Water Regulation Committee (CWRC)
The CWMA and CWRC are the two-tier statutory implementing mechanism created to enforce the Cauvery Water Disputes Tribunal award as modified by the Supreme Court in 2018. The CWRC handles day-to-day technical monitoring and short-term release recommendations, while the CWMA is the apex authority that reviews, ratifies, or modifies the CWRC's recommendations and issues binding directions to the party states.
Key Details
- Both bodies were constituted by the Union government in June 2018, pursuant to the Supreme Court's February 2018 judgment and under the framework of the Inter-State River Water Disputes Act, 1956.
- CWMA composition: a full-time Chairperson (a Secretary-level officer to the Government of India), full-time Members for Water Resources and Agriculture, part-time Central government representatives, and part-time representatives from each basin state/UT — Karnataka, Tamil Nadu, Kerala and Puducherry.
- CWRC functions as the technical/monitoring arm, tracking reservoir storage and gauge-station flow data and recommending release schedules, especially for distress-year adjustments to the Tribunal's fixed monthly schedule.
- CWMA orders are binding directions to the state governments to implement flow at specified gauge stations (here, Biligundlu, the key monitoring point on the Karnataka-Tamil Nadu border).
This episode shows the two-tier mechanism functioning as designed — the CWRC's technical recommendation is placed before the CWMA, which reviews both states' submissions before converting it into a binding directive.
Distress-Year Water Sharing Formula under the Tribunal Award
The Cauvery Water Disputes Tribunal's 2007 award (as modified by the Supreme Court in 2018) fixes a normal-year monthly release schedule at Biligundlu, but also provides a mechanism to proportionately adjust releases during deficient monsoon ("distress") years based on actual basin inflows.
Key Details
- The Tribunal's schedule sets Karnataka's obligation in cusecs/TMC terms by month, revisited by the CWRC/CWMA when actual inflow deviates significantly from the normal-year assumption.
- Karnataka's four major reservoirs relevant to compliance are the Krishna Raja Sagar (KRS), Kabini, Hemavathi and Harangi.
- Distress-sharing determinations require both states to submit hydrological data (inflow, storage, and downstream flow figures) to the CWRC/CWMA for assessment before a revised release figure is set.
The 12,000-cusec order followed exactly this distress-assessment process — Tamil Nadu presented gauge-station flow data showing a shortfall against an earlier, lower CWRC-directed release, prompting a revised, higher directive after Karnataka's reservoir inflow position was also assessed.
Geography of the Cauvery Basin and Biligundlu Gauge Station
The Cauvery river originates at Talakaveri in the Western Ghats (Kodagu district, Karnataka) and flows through Karnataka and Tamil Nadu before draining into the Bay of Bengal; Biligundlu, located near the Karnataka-Tamil Nadu border, is the key gauge station used to measure inter-state flow compliance.
Key Details
- The Cauvery basin covers parts of Karnataka, Tamil Nadu, Kerala and the Union Territory of Puducherry.
- Biligundlu is the standard measurement point specified in the Tribunal award for verifying Karnataka's compliance with release obligations to Tamil Nadu.
- The river is one of India's classic inter-state water-sharing case studies, alongside the Krishna, Godavari and Narmada disputes, all governed under the ISRWD Act, 1956 framework.
Flow measured at Biligundlu is the specific metric both the CWRC and CWMA use to determine whether Karnataka has met its release obligation — the basis for both the shortfall complaint and the revised order.
- CWMA-directed release: 12,000 cusecs per day at Biligundlu, for 15 days.
- Both CWMA and CWRC constituted: June 2018, following the Supreme Court's February 2018 judgment.
- Karnataka's four Cauvery reservoirs: KRS, Kabini, Hemavathi, Harangi.
- Basin states/UT: Karnataka, Tamil Nadu, Kerala, Puducherry.
- Statutory basis: Inter-State River Water Disputes Act, 1956; Cauvery Water Disputes Tribunal award, 2007 (modified by Supreme Court, 2018).
- Key gauge station for compliance measurement: Biligundlu, on the Karnataka-Tamil Nadu border.