Cauvery Authority Upholds 4,000-Cusec Water Release to Tamil Nadu for 15 Days

The Cauvery Water Management Authority has upheld a direction requiring Karnataka to release 4,000 cubic feet per second of Cauvery water to Tamil Nadu for 15 days.

The authority confirmed the direction during its 58th meeting in New Delhi. The earlier instruction was issued by the Cauvery Water Regulation Committee, which monitors flows, reservoirs and the implementation of water-sharing arrangements.

Tamil Nadu told the meeting that it had received 42.209 thousand million cubic feet, or tmcft, at Biligundlu against a calculated pro-rata entitlement of 57.190 tmcft. According to the state’s submission, the resulting shortfall was 14.981 tmcft.

Biligundlu, located on the interstate boundary, is the principal point used to measure Cauvery water entering Tamil Nadu from Karnataka. Tamil Nadu representatives also raised the state’s irrigation requirements and reservoir conditions. The river is particularly important to farmers in the Cauvery delta, where the timing of water availability can influence crop planning and irrigation.

Karnataka opposed the release, citing inadequate storage in its reservoirs as well as its own drinking-water and agricultural requirements. The disagreement reflects the recurring difficulty faced by regulatory bodies when available water is insufficient to satisfy every state’s stated needs.

A flow expressed in cusecs is a rate, not a total quantity. One cusec means one cubic foot of water moving past a point every second. If a continuous release of 4,000 cusecs were maintained for the full 15-day period, it would amount to approximately 4.90 tmcft. The quantity actually recorded downstream can differ because of rainfall, evaporation, local withdrawals, travel time and changes in the release rate.

Tamil Nadu Water Resources Department data reported on September 25 showed inflow into the Mettur reservoir at 4,960 cusecs. Outflow for irrigation was being maintained at 12,020 cusecs. When outflow remains above inflow, the reservoir must supply part of the difference from stored water.

The present order should not be interpreted as a permanent resolution of the dispute. It is an operational direction covering a limited period. The authority may reassess conditions after examining subsequent rainfall, reservoir levels and verified flows.

Water-sharing decisions frequently produce sharply different political reactions in Tamil Nadu and Karnataka. The confirmed position is that the CWMA upheld a 4,000-cusec release for the next 15 days.

Compliance can be assessed only through observed releases and measurements at the designated monitoring point. Future legal or administrative challenges may affect how the dispute develops, but they do not by themselves cancel the authority’s existing direction.

The coming two weeks will therefore be important for delta agriculture and relations between the two states. Reservoir data and independently recorded flows will provide a clearer picture than political claims alone.

Key points

  • The CWMA upheld a 4,000-cusec release for 15 days.
  • Tamil Nadu reported a 14.981-tmcft shortfall at Biligundlu.
  • Karnataka opposed the direction, citing its own water requirements.
  • Mettur’s reported irrigation outflow exceeded its inflow.
  • Compliance must be assessed using measured downstream flows.

Sources

The New Indian Express

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