The Tamil Nadu government on Monday moved the Supreme Court against Karnataka, accusing its neighbouring state of failing to release its share of Cauvery water in accordance with directions issued by the Cauvery Water Management Authority (CWMA) and the Cauvery Water Regulation Committee (CWRC).
The petition was filed on the instructions of Tamil Nadu Chief Minister C Joseph Vijay after Karnataka allegedly failed to release the required amount of Cauvery water despite repeated directions from the river authorities.
At its 139th meeting held on July 28, the CWRC reviewed the hydrological and meteorological conditions in the Cauvery basin and directed Karnataka to ensure the release of 3,500 cusecs of water per second at Biligundlu for 15 days, from July 29 to August 12, by releasing water from the Krishnaraja Sagar (KRS) and Kabini reservoirs.
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The CWMA subsequently reaffirmed CWRC’s decision during its 54th emergency meeting on July 30 after reviewing the basin’s water availability and rainfall conditions.
The Tamil Nadu government has said that the inflow recorded at Biligundlu between July 29 and August 2 ranged just between 158 and 550 cusecs, far below the mandated 3,500 cusecs.
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Tamil Nadu further said that Karnataka had sufficient water available in its reservoirs to comply with the release order. As of August 3, the Krishnaraja Sagar reservoir held 23.078 thousand million cubic feet (TMC) of water, Kabini 18.610 TMC, Harangi 7.827 TMC and Hemavathi 28.022 TMC.
The combined storage in the four reservoirs stood at 77.537 TMC, including 67.517 TMC of utilisable water.
The state contended that there was no practical difficulty before Karnataka that prevented it from releasing Tamil Nadu’s rightful share of water on a proportional basis.
It also pointed to heavy rainfall in the catchment areas of the KRS and Kabini reservoirs, which has significantly increased inflows.
Based on the proportional sharing formula, Tamil Nadu claimed it was entitled to receive 26.954 TMC of water at Biligundlu, substantially higher than the 4.536 TMC directed by the CWMA for the current period.
Since Karnataka had failed to release even the quantity ordered by the CWMA, Tamil Nadu said the state government, acting on the advice of senior legal counsel, decided to move the Supreme Court.
The petition seeks appropriate directions to ensure Karnataka complies with the Cauvery authorities’ orders and that Tamil Nadu receives its rightful share of Cauvery water within the stipulated timeframe.

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