Reservoirs 31% Below Capacity After Monsoon
Why in News?
- On 19 October 2026, Down To Earth reported that India's major reservoirs hold 31 per cent less water than their capacity after the monsoon, based on the Central Water Commission bulletin of 15 October 2026.
- The 178 reservoirs monitored held 126.717 billion cubic metres, or 68.58 per cent of their usable capacity of 184.762 billion cubic metres.
- Storage is 24.53 per cent lower than last year and 16.44 per cent below the ten-year normal.
- Southern states face the sharpest shortage, with the Cauvery and Pennar basins among the most deficient.
Key Terminologies
- Usable Capacity
- The volume of water a reservoir can store and release for use. The 178 reservoirs in the bulletin hold about 71.67 per cent of India's total usable reservoir capacity of 257.812 billion cubic metres.
- Normal Storage
- The average storage for the same date over the previous ten years. Comparing with it shows whether a year is better or worse than usual.
- River Basin
- The land area drained by a river and its tributaries. Basin-wise data shows which regions are short of water, such as the Cauvery and Pennar basins.
- Billion Cubic Metres
- A unit for very large water volumes. One billion cubic metres equals one thousand million cubic metres.
Key Issues
- National Shortfall: The Central Water Commission bulletin of 15 October 2026 shows 126.717 billion cubic metres in storage, which is 41.193 billion cubic metres less than last year and 24.930 billion cubic metres below normal.
- Southern Deficit: The Pennar basin is 72.32 per cent below normal and the Cauvery basin 60.50 per cent below. Mettur in Tamil Nadu holds 32.49 per cent of its normal storage and Srisailam in Andhra Pradesh 33.64 per cent.
- Western Peninsula Strain: Jaikwadi in Maharashtra holds 15.55 per cent of normal storage and Manjra 12.45 per cent. Karnataka's Tungabhadra holds 22.54 per cent and Ghataprabha 22.56 per cent.
- Uneven Basins: The Sabarmati basin is 38.03 per cent and the Krishna 32.59 per cent below normal, while Swarnarekha is 30.74 per cent, Narmada 7.81 per cent and Mahanadi 2.95 per cent above normal. The Ganga, Godavari, Brahmaputra and Tapti basins are near normal.
- Power Link: Twelve of the 20 reservoirs linked to hydropower projects are at or below normal storage, which affects electricity generation planning.
Key Implications
Positive/Pros/Merits
- Early Warning: A regular basin-wise comparison with last year and normal lets states plan releases before the dry season.
- Some Basins Are Secure: Narmada, Mahanadi and Swarnarekha are above normal, which shows that surplus water exists in some regions, which is an inference.
- Near-Normal Ganga Region: The Ganga, Godavari and Brahmaputra basins are near normal, so major northern and eastern systems are not under stress.
- Reservoir Coverage: The 178 reservoirs hold 71.67 per cent of usable capacity, so the bulletin is a strong guide to national storage.
Negative/Cons/Demerits
- Drinking and Irrigation Risk: With Cauvery storage 60.50 per cent below normal, summer drinking water and irrigation supply in the south may be tight, which is an inference.
- Hydropower Pressure: Twelve of 20 hydropower-linked reservoirs at or below normal reduce room for generation at a time of high power demand.
- Inter-State Competition: Deficient basins such as the Krishna and Cauvery cross state borders, so shortages can sharpen water-sharing disputes, an analytical point.
- Weak Monsoon Carry-Over: Storage 24.53 per cent below last year after the monsoon leaves a thin buffer for the coming months.
Key Initiatives
- Central Water Commission Bulletin: The 15 October 2026 bulletin tracks 178 major reservoirs, covering about 71.67 per cent of India's usable reservoir capacity, and compares storage with last year and normal.
- Jal Shakti Abhiyan: Catch the Rain 2025: The Jal Shakti Minister launched it on 22 March 2025 in Panchkula, with the Ministry of Environment, Forest and Climate Change and the Haryana government as partners.
- Catch the Rain 2026 in Delhi: Chief Minister Rekha Gupta launched it on 1 May 2026, making rainwater harvesting mandatory for buildings of 100 square metres or more, with up to Rs 50,000 in assistance.
- Atal Bhujal Yojana: Down To Earth reported in February 2018 that this community-led groundwater plan of Rs 6,000 crore was being readied for seven water-stressed states, with the Centre and the World Bank sharing the cost.
The Ministry of Jal Shakti and the Central Water Commission monitor storage through regular bulletins, and the Catch the Rain campaigns promote rainwater harvesting and groundwater recharge. Delhi has made harvesting compulsory for larger buildings. The reports reviewed give no state-wise release plan for the deficient southern basins.
Director's Perspective
Way Forward
- Publish a state-wise release and drinking-water priority plan for the Cauvery, Pennar and Krishna basins before the dry season begins.
- Give a clear rule for hydropower reservoirs that are at or below normal, so that drinking and irrigation needs are met first.
- Scale groundwater recharge in the southern states, since reservoirs alone cannot cover a deficit of this size.
- Add reservoir-level forecasts to the bulletin, so farmers can plan cropping around expected storage.
India's storage picture is split: central and eastern basins are comfortable, while the south carries a heavy deficit. The data is strong, with a regular bulletin covering 71.67 per cent of usable capacity, but it also shows a thin buffer, with storage 24.53 per cent below last year. In a Mains answer, credit the monitoring system and the surplus basins, then conclude that basin-wise planning and groundwater recharge are needed for the water-short south.
GS Relevance
Frequently Asked Questions
How much water is in India's reservoirs in October 2026?
India's 178 major reservoirs held 126.717 billion cubic metres on 15 October 2026, or 68.58 per cent of usable capacity, according to the Central Water Commission bulletin reported by Down To Earth. That is 24.53 per cent less than last year.
Which river basins are most deficient in 2026?
The Pennar basin is 72.32 per cent below normal and the Cauvery basin 60.50 per cent below, according to the 15 October 2026 bulletin. The Sabarmati and Krishna basins are also deficient, by 38.03 and 32.59 per cent.
What is normal reservoir storage?
Normal storage is the average storage for the same date over the previous ten years. The Central Water Commission uses it as a benchmark, and on 15 October 2026 national storage was 16.44 per cent below it.
PYQ Practice — Statement Analysis
1 The Narmada basin was above normal storage in the 15 October 2026 bulletin.
It was 7.81 per cent above normal.
2 The Cauvery basin was above normal storage in the 15 October 2026 bulletin.
It was 60.50 per cent below normal.
3 Normal storage means the average storage for the same date over the previous ten years.
It is the benchmark used in the bulletin.