Hydrological Resource Metrics: Biligundulu Gauging Station Tracks 330 TMC Inflow as Kuruvai Paddy Sowing Crosses 2 Lakh Acres
In a major hydrological milestone re-defining subcontinental river-basin accounting and deltaic agricultural metrics, Tamil Nadu received an extraordinary 330 thousand million cubic feet (TMC ft.) of Cauvery water during the 2025–26 water year. Documented accurately via data logs at the Biligundulu entry gauging station along the state border, the heavy volume significantly out-paced the baseline allocations fixed under statutory inter-state river water tribunal awards.
The 177.25 TMC Statutory Baseline vs. Realized Inflow Volumetrics
The quantitative water management sheets map out rare rainfall distribution cycles alongside upcoming agricultural water availability challenges:
- Surpassing the Supreme Court Mandate: While the statutory layout—fixed by the **Cauvery Water Disputes Tribunal (CWDT) in 2007 and modified by the Supreme Court in 2018—allocates 177.25 TMC ft. to Tamil Nadu**, the actual receipt scaled to **330 TMC ft.** due to heavy reservoir discharges in Karnataka.
- A Rare Historical Inflow Peak: Gauging logs verify this as **only the seventh time in history that Tamil Nadu has received a surplus above its prescribed share**, and the second instance since the reorganisation of state flow monitoring that total annual inflow crossed the **300 TMC ft. threshold**.
- Uncommon Southwest Monsoon Gains: Reflecting intense climate anomalies, **nearly 292 TMC ft. of the total water was received in a rapid burst between June and October 2025**, filling downstream delta networks paperlessly.
- Kuruvai Paddy Status and Future Vulnerabilities: Bolstered by early water security, **Kuruvai paddy cultivation commenced vigorously across the Cauvery delta, covering 2.1 lakh acres as of June 1, 2026**. However, low reservoir storage levels and an impending Southwest monsoon dry spell pose threats for the **2026–27 water year**.