Karnataka’s water storage position has weakened before the period when reservoirs would normally face sustained withdrawals for irrigation and drinking water. Data reported by Prajavani shows that the state’s 14 major reservoirs held 540.94 TMC feet by the third week of October, about 60% of their combined 895.65 TMC feet capacity. At the same point last year, the reservoirs held 824.56 TMC feet.
The significance of the decline is not limited to the quantity of water left in storage. It is the timing of the fall that changes the administrative challenge. In recent years, the larger drawdown generally became visible around December-end or January, after water had been released for irrigation and drinking purposes. This year, the reservoirs entered that phase with substantially less water already available, following deficient southwest monsoon rainfall and continuing releases to neighbouring states, according to the report.
The figures point to a water-security problem that is unevenly distributed across Karnataka. The Cauvery basin reservoirs were at just 48% of their combined capacity, with 54.74 TMC feet available against a total capacity of 114 TMC feet. Last year, the same reservoirs held 108.82 TMC feet during the comparable period. The Krishna basin performed better in relative terms, but its storage was also lower than last year: 296 TMC feet, or around 70% of its 422 TMC feet capacity, compared with 393 TMC feet a year earlier.
The three reservoirs in the Malnad region held 170 TMC feet, or 52% of their combined 328 TMC feet capacity. Their storage had been 294 TMC feet in the previous year. These basin-level differences matter because a statewide average can conceal where water stress is emerging first. A reservoir system with 70% storage is not interchangeable with another at 48%, particularly when the two serve different command areas, cities and downstream obligations.
The sharpest warning comes from reservoirs where current inflows are weak or absent while water continues to be released. The Tungabhadra reservoir held 55.64 TMC feet, equivalent to 53% of capacity, against 69.22 TMC feet last year. Its inflow was reported as zero, while the outflow stood at 12,277 cusecs. That combination makes the reservoir’s present level dependent not on replenishment but on how quickly stored water is being drawn down.
The pattern is also visible in individual reservoirs across the state. Linganamakki held 78 TMC feet, or 51% of capacity, compared with 140.25 TMC feet last year. Its inflow was 1,329 cusecs and its outflow 6,179 cusecs. Supa held 76.77 TMC feet, or 53% of capacity, down from 124.09 TMC feet a year earlier; the reservoir was receiving 510 cusecs and releasing 5,658 cusecs.
Harangi’s storage was reported at 4.76 TMC feet, or 56% of capacity, against 8 TMC feet last year. Its inflow was 669 cusecs and outflow 1,200 cusecs. Hemavathi, an important reservoir in the Cauvery system, had 15.76 TMC feet, or 42% storage, compared with 32.43 TMC feet in the previous year. It was receiving 996 cusecs and releasing 300 cusecs.
The data is not uniformly negative. Bhadra held 56.22 TMC feet, or 79% of capacity, although this was still below the 69.22 TMC feet recorded last year. Ghataprabha was reported to be full, with 50.77 TMC feet in storage and an outflow of 164 cusecs. These reservoirs demonstrate why the state’s water position cannot be understood through a single statewide number. Storage, inflow and release conditions vary substantially by basin and individual project.
Malaprabha held 21.10 TMC feet, or 56% of capacity, compared with 37.73 TMC feet and full storage last year. Vanivilas Sagar had 19.84 TMC feet, or 65% of capacity, against 28.34 TMC feet in the comparable period. Both its inflow and outflow were reported as zero. The absence of inflow is important even where the percentage of storage appears more comfortable: the available stock may remain stable only until withdrawals resume or demand rises.
The immediate administrative question is therefore not simply whether a reservoir is half-full or two-thirds full. It is how long the available stock can support competing requirements under current inflow and release conditions. The supplied report does not provide a district-wise drinking-water assessment, crop-wise irrigation demand, city-wise supply position or a government release schedule. It also does not establish how much of the water released to Tamil Nadu, Telangana and Andhra Pradesh was linked to specific statutory, tribunal or operational requirements. Those details would be necessary to calculate the precise effect on future allocations.
What the available figures do establish is a narrower but consequential pattern: the state is beginning the post-monsoon period with less stored water than last year, while several reservoirs are already recording outflows that exceed inflows. The contrast is particularly clear at Linganamakki, Supa, Harangi and Tungabhadra. In each case, the reservoir balance is being shaped by releases from existing storage rather than by strong replenishment.
This shifts the focus from monsoon performance to reservoir management. Water storage is a moving balance between opening stock, inflow, evaporation and outflow. The report supplies figures for storage, inflow and outflow at several reservoirs, but not the full accounting required to attribute the decline to any one factor. It identifies deficient monsoon rainfall and inter-state releases as important circumstances, while the reservoir-level numbers show how those pressures are appearing in different parts of Karnataka.
The Cauvery basin presents the most immediate concern in the reported data. Its storage stood at 48% of capacity, less than half the previous year’s comparable volume. Hemavathi was at 42%, while Harangi was at 56%. These numbers do not by themselves predict a drinking-water crisis or an irrigation shortfall, but they reduce the margin available to manage future demand. That margin is an administrative resource: when storage is high, authorities have more room to sequence releases; when storage is low, every release decision carries greater consequence.
The Krishna basin’s 70% storage level offers a different picture but not a return to normal conditions. Its current 296 TMC feet was below the 393 TMC feet recorded last year. The Malnad reservoirs were also at 52%, with 170 TMC feet available compared with 294 TMC feet a year earlier. The variation suggests that water planning must remain basin-specific rather than rely on a uniform statewide conservation or release approach.
The numbers also expose the limits of headline storage percentages. A reservoir at 79% may still contain less water than it did last year, as seen at Bhadra. A reservoir at 65% may have no current inflow, as reported for Vanivilas Sagar. Another at 53% may have zero inflow but a large outflow, as in the case of Tungabhadra. Percentage of capacity describes the position at one moment; inflow and outflow indicate the direction in which that position is moving.
For cities and towns, the significance lies in the connection between reservoir operations and public water systems. The report does not identify which urban water supplies depend on which reservoirs, nor does it document restrictions or changes in municipal schedules. It would therefore be premature to claim that urban supply has already been affected. But the storage decline places greater importance on the next decisions made by irrigation, water-resources and local-government authorities, particularly as the dry season approaches.
For farmers, the relevant issue is similarly not only the amount stored but the timing and reliability of releases. A lower opening stock can affect how authorities stage water distribution across the irrigation season, although the report does not state whether any revised release plan has been announced. The combination of deficient rainfall, lower year-on-year storage and active outflows makes the management of competing demands more central than it would be after a strong monsoon.
The available evidence leaves several questions open. The report does not state the cumulative rainfall deficit, the projected inflows for the remainder of the northeast monsoon, the volume reserved for drinking water, or the formal operating rules governing each reservoir. It also does not indicate whether the state has issued a new water-management directive. These are not minor omissions: they determine whether the current storage position is a temporary seasonal variation or the beginning of a more sustained supply constraint.
Still, the central signal is clear. Karnataka’s major reservoirs are carrying considerably less water than last year at the same stage, and the decline has appeared earlier than the usual late-season drawdown described in the report. The state’s water position is also highly uneven: Ghataprabha was full, Bhadra held 79%, Krishna basin reservoirs were at 70%, while the Cauvery system was at 48% and several individual reservoirs had weak or zero inflows.
The next meaningful indicators will be the movement of inflows, the volume of continued releases, and any official decisions on irrigation and drinking-water allocations. Until those figures are available, the reservoir data supports a firm conclusion about reduced storage and tighter operating margins, but not a definitive forecast of shortages. The immediate urban and rural water question is how authorities will manage that narrower margin through the remaining monsoon period and into the next irrigation cycle.
