Telangana’s reservoir storage has fallen by nearly 40 per cent over the past year, turning the end of the 2026 southwest monsoon into a water-management warning for the state. Data cited from the state irrigation department’s Irrigation Decision Support System show that reservoirs on the Krishna and Godavari rivers together held 503.43 tmc ft on September 30, compared with 834.92 tmc ft on the same date in 2025.
The immediate concern is not only the volume already lost but also the length of the period that the remaining water may have to cover. Officials told Deccan Chronicle that available stocks will need to be managed until August 2027, when fresh inflows are expected to begin, provided the next monsoon is normal. That places the focus on reservoir operations between the end of the southwest monsoon and the arrival of the next substantial inflows.
The figures also show that Telangana’s water position is shaped by conditions beyond its own administrative boundaries. The Krishna and Godavari catchments that feed the state’s reservoirs extend into Maharashtra, Karnataka and Chhattisgarh. The report notes that rainfall during the Northeast Monsoon generally does not occur over these catchment areas at the same scale, limiting the likelihood of a major near-term recovery in storage.
Krishna reservoirs carry the sharper decline
The Krishna basin accounts for the largest part of the shortfall. Storage in the state’s Krishna reservoirs stood at 323.37 tmc ft on September 30, down from 583.35 tmc ft a year earlier. That is a reduction of 259.98 tmc ft, or roughly 45 per cent.
The decline is also significant when measured against the longer-term benchmark supplied in the report. The 10-year average storage in Krishna reservoirs on September 30 was 479.9 tmc ft. The 2026 level was therefore about 156.53 tmc ft below that average. In other words, the current position is not simply weaker than last year’s unusually different outcome; it is also substantially below the stated recent historical average.
The beginning-of-season figures provide another layer of context. Krishna reservoirs held 249.49 tmc ft on June 1, 2026, compared with 239.95 tmc ft on June 1, 2025 and a 10-year average of 198.68 tmc ft. This means the basin entered the 2026 southwest monsoon with more water than it had at the same point in 2025 and above the 10-year average. The subsequent decline indicates that the season failed to generate enough inflows to sustain or significantly build storage by its conclusion.
That pattern matters for how reservoir stress is understood. A weak end-of-season position does not necessarily mean that stocks were low at the beginning of the year. It can also reflect inadequate inflows during the months when reservoirs are expected to accumulate water for the following dry period. In the Krishna basin, the supplied figures show precisely that contrast: a relatively stronger starting point followed by a much weaker September 30 position.
Godavari storage is also below its benchmark
The Godavari reservoirs recorded a smaller numerical decline than the Krishna system but remained well below the previous year’s level and the 10-year average. Storage on September 30, 2026 was 180.06 tmc ft, compared with 251.57 tmc ft in 2025. The fall of 71.51 tmc ft represents a decline of about 28 per cent.
The 2026 Godavari storage level was also 73.58 tmc ft below the reported 10-year average of 253.64 tmc ft for September 30. This makes the basin an important part of the state-wide shortfall even though the percentage decline was less severe than in the Krishna system.
As with the Krishna reservoirs, the June figures reveal that the problem developed over the monsoon season rather than being fully established at its start. Godavari storage on June 1, 2026 stood at 99.49 tmc ft, below the 110.4 tmc ft 10-year average and marginally below the 101.22 tmc ft recorded on June 1, 2025. By September 30, the gap had widened considerably, leaving the basin at 180.06 tmc ft against 253.64 tmc ft for the longer-term average.
Together, the basin figures show that the state is dealing with two different but connected conditions. The Krishna system experienced the larger year-on-year and percentage decline, while the Godavari system also ended the monsoon well below its recent average. The combined result is a substantially weaker water reserve across the principal river systems that support Telangana’s irrigation network.
Why the catchment geography matters
Reservoir storage is often discussed as a state-level number, but the inflows that replenish these reservoirs are governed by rainfall across a much wider geography. The report identifies catchment areas in Maharashtra, Karnataka and Chhattisgarh as critical to the two river systems. This means Telangana’s water managers cannot assess future availability only through rainfall within the state.
The report attributes the inadequate inflows to a poor rainy season affected by a “super” El Nino in the Pacific Ocean. That explanation is presented as the cause cited in the report, while the operational consequence is visible in the reservoir data: both river systems ended the southwest monsoon with considerably less water than in 2025 and below their 10-year September averages.
The geographic spread of the catchments also creates an institutional challenge. Reservoir management in Telangana depends on hydrological conditions and water flows that originate outside the state’s boundaries. The state irrigation department can monitor storage and manage releases within its systems, but the rainfall that determines incoming flows is distributed across multiple states and river basins.
This makes the Irrigation Decision Support System important as an administrative tool. The online river-flow monitoring network provides a common basis for tracking storage across major and medium reservoirs. The data cited in the report allow officials to compare current stocks with last year’s levels and 10-year averages, while also distinguishing between the Krishna and Godavari systems.
The long management window ahead
The most consequential detail in the report is the projected management period. Officials said the water now available may have to be shepherded until August 2027, when fresh inflows are expected if the next monsoon is normal. This does not establish that a shortage will occur in every use category or location, but it does establish the length of the planning horizon facing the irrigation administration.
The timing of the next inflows is critical because the end of the southwest monsoon marks a shift from accumulation to management. With storage at 503.43 tmc ft across the two river systems, authorities must plan around the water already in the reservoirs rather than assume that the coming months will substantially restore the deficit. The report says some rain may occur during the Northeast Monsoon, but adds that these rains typically do not fall over the relevant catchment areas in Maharashtra, Karnataka and Chhattisgarh.
The state’s administrative task therefore involves managing uncertainty on two fronts. The first is how much of the remaining water can be used before the next major inflow season. The second is whether the 2027 southwest monsoon will be normal enough to rebuild stocks. The report does not provide a reservoir-wise allocation plan, release schedule or sectoral demand estimate, so the precise implications for irrigation, drinking water or other users cannot be established from the available material.
What the data do establish is that the margin has narrowed. Total storage across the two river systems is 331.49 tmc ft below the level recorded on September 30, 2025. It is also below the combined level implied by the two reported 10-year averages: 733.54 tmc ft, against the current 503.43 tmc ft. That comparison places the current position roughly 230.11 tmc ft below the combined September average cited for the Krishna and Godavari reservoirs.
What the numbers reveal about urban water security
Although the report is centred on reservoirs and irrigation, the issue extends into the wider built environment. Cities and towns depend on reliable water systems, while agriculture and other economic activities draw on the same river basins and storage networks. When reservoirs end the monsoon below both the previous year’s level and the 10-year average, water management becomes a question of sequencing demand across the dry months.
The supplied evidence does not quantify municipal demand or identify specific cities at risk. It does, however, show that the state’s principal storage systems are entering the post-monsoon period with significantly reduced reserves. That makes the condition relevant to urban governance because water availability is shaped not only by local distribution infrastructure but also by basin-level storage, inflows and administrative decisions on releases.
The data also underline the limits of treating monsoon performance as a single state-wide indicator. Krishna and Godavari reservoirs did not begin the 2026 season from identical positions, and their declines were not equal. Basin-specific monitoring is therefore necessary for understanding where the pressure is greatest. In the figures supplied, the Krishna system is the sharper concern, while the Godavari system remains materially below its longer-term September benchmark.
The central fact is clear: Telangana has finished the 2026 southwest monsoon with substantially less reservoir water than it had a year earlier and less than the reported 10-year averages. The immediate policy question is how the state will manage 503.43 tmc ft across the two river systems until the next major inflows. The available report identifies the monitoring system, the basin-level deficits and the expected August 2027 recovery window, but does not provide the detailed release priorities or contingency measures that will determine how those reserves are used.
