BharatNotes India's Water Availability — Key Statistics
India receives an average annual precipitation of approximately 4,000 BCM (Billion Cubic Metres). However, much of this is lost to evapotranspiration, runoff into the sea, and seasonal flooding.
According to the Central Water Commission (CWC) Assessment of Water Resources of India, the average annual water availability (1985–2023) is estimated at approximately 2,116 BCM.
The total utilisable water with conventional approach is 1,137 BCM, comprising:
- Surface water: 690 BCM (utilisable)
- Groundwater: 447 BCM (replenishable and utilisable)
Per Capita Water Availability (Declining Trend)
| Year | Per Capita Availability (m³/year) |
|---|---|
| 1951 | ~5,177 |
| 2001 | ~1,816 |
| 2011 | ~1,545 |
| Projected 2025 | ~1,367 |
Water stress threshold (UN): 1,700 m³/capita/year — India is approaching water-stressed status nationally and several states (Punjab, Haryana, Rajasthan) are already severely water-stressed.
Irrigation accounts for approximately 78% of India's total water use, making it the dominant sector. Domestic use is ~6%, industry ~5%, energy ~3%, others ~8%.
India's Major River Basins (CWC Classification)
The Central Water Commission classifies India's drainage into 20 river basins — 12 major (each with catchment >20,000 sq km) and 8 composite/medium-and-minor groupings.
| Basin | Catchment (lakh sq km) | Avg Annual Flow (BCM) | Utilisable (BCM) |
|---|---|---|---|
| Ganga (incl. Yamuna) | 8.61 | 525.02 | 250 |
| Indus (Indian portion) | 3.21 | 73.31 | 46 |
| Godavari | 3.13 | 110.54 | 76.3 |
| Krishna | 2.59 | 78.12 | 58.0 |
| Brahmaputra (Indian portion) | 1.94 | 537.24 | 24 (only) — terrain/political constraints |
| Mahanadi | 1.42 | 66.88 | 50.0 |
| Narmada | 0.99 | 45.64 | 34.5 |
| Cauvery | 0.81 | 21.36 | 19.0 |
| Tapi | 0.65 | 14.88 | 14.5 |
| Brahmani-Baitarani | 0.51 | 28.48 | 18.3 |
| Sabarmati | 0.22 | 3.81 | 1.93 |
| Mahi | 0.35 | 11.02 | 3.1 |
The Ganga-Brahmaputra-Meghna system carries ~60% of India's surface water but the eastern flow into Bangladesh is largely unutilised by India. Peninsular rivers face seasonal scarcity (rain-fed, narrow catchments).
Watershed Management
A watershed is the geo-hydrological area drained by a river or stream — the natural unit for integrated soil and water conservation. The National Watershed Development Project for Rainfed Areas (NWDPRA, 1990) evolved into the present integrated framework.
| Programme | Year | Focus |
|---|---|---|
| Pradhan Mantri Krishi Sinchayee Yojana – Watershed Development Component (PMKSY-WDC) | Restructured 2015; PMKSY-WDC 2.0 (2021-26) | Soil-water conservation in rainfed areas; Detailed Project Reports for 8,462 watersheds |
| MGNREGA convergence | 2006 onwards | ~60% of NREGS funds for water-conservation works (farm bunds, check dams, ponds) |
| Atal Bhujal Yojana | 2019 | Demand-side groundwater management (covered separately below) |
| Mission Amrit Sarovar | April 2022 | 75 ponds rejuvenated/built per district; over 80,000+ Amrit Sarovars completed |
| Catch the Rain Campaign | 2021 (annual) | "Where it falls, when it falls"; pre-monsoon rainwater harvesting |
Irrigation in India
India has one of the largest irrigated areas in the world. Approximately 54% of net sown area is under irrigation.
Types of Irrigation
| Type | Share of Irrigated Area | Key States | Features |
|---|---|---|---|
| Tube well / Borewell (Groundwater) | Largest share — ~60%+ | Punjab, Haryana, UP, Maharashtra | Flexible, responsive; major cause of groundwater depletion |
| Canal irrigation | ~25–30% | UP, Rajasthan, Haryana, Punjab, Bihar | Best for flat terrain; high capital cost; waterlogging risk |
| Tank irrigation | ~5–6% | Tamil Nadu, AP, Telangana, Karnataka | Traditional; historically Chola tanks; declining due to neglect |
| Other wells (open wells) | Declining | Maharashtra, Gujarat | Less efficient than tube wells |
Drip and sprinkler irrigation are micro-irrigation methods being promoted under Pradhan Mantri Krishi Sinchayee Yojana (PMKSY) — "Har Khet Ko Pani, More Crop Per Drop."
- Drip irrigation (trickle irrigation) — delivers water directly to root zone; ideal for horticulture, vineyards; major uptake in Maharashtra, Karnataka, Gujarat.
- Sprinkler irrigation — simulates rainfall; used for uneven terrain and field crops.
Major Irrigation Projects
| Project | River | State(s) | Key Facts |
|---|---|---|---|
| Bhakra-Nangal | Sutlej | Himachal Pradesh (dam at Bilaspur); benefits Punjab, Haryana, Rajasthan | Gobind Sagar reservoir; Nehru called it a "temple of modern India"; concrete gravity dam, height 226 m (2nd tallest gravity dam in Asia); commissioned 1963; 1,325 MW |
| Hirakud Dam | Mahanadi | Odisha (Sambalpur) | World's longest major earthen dam (25.8 km including dykes); main dam 4.8 km; commissioned 1957 — first major multipurpose project post-independence; reservoir declared Ramsar site (12 October 2021) |
| Sardar Sarovar Project (SSP) | Narmada | Dam in Gujarat; benefits Gujarat, MP, Rajasthan, Maharashtra | Concrete gravity dam, height 138.68 m (Full Reservoir Level); controversial displacement (Narmada Bachao Andolan, Medha Patkar); FRL achieved September 2017; Statue of Unity downstream |
| Tehri Dam | Bhagirathi + Bhilangana confluence | Uttarakhand (Tehri Garhwal) | India's tallest dam at 260.5 m (rock-and-earth-fill embankment, world's 13th tallest); 1,000 MW + 1,000 MW pumped storage; Tehri township submerged; Seismic Zone IV/V concerns |
| Nagarjuna Sagar | Krishna | Andhra Pradesh/Telangana | One of India's largest masonry dams; height 124 m, length 1.55 km; reservoir 11.47 BCM |
| Indira Gandhi Canal (IGNP) | Sutlej-Beas via Harike Barrage | Rajasthan | World's longest irrigation canal at ~649 km (main canal); transforms Thar Desert; environmental concerns (waterlogging, salinity, alkalinity) |
| Sardar Sarovar Pumped Storage | Narmada | Gujarat | Underground powerhouse; 1,200 MW; Garudeshwar weir |
| Polavaram | Godavari | Andhra Pradesh | Multipurpose national project (Andhra Pradesh Reorganisation Act 2014); facing repeated cost-revisions and delays; expected partial completion 2027 |
Groundwater in India
India is the world's largest user of groundwater, extracting approximately 245 BCM per year (as per CGWB 2024 assessment) — more than the USA and China combined.
Groundwater Depletion — States Most Affected
| State | Status | Main Cause |
|---|---|---|
| Punjab | Critically over-exploited | Paddy cultivation with free power subsidies |
| Haryana | Over-exploited | Green Revolution crops; canal seepage inadequacy |
| Rajasthan | Over-exploited in western parts | Arid climate; high agricultural demand |
| Tamil Nadu | Over-exploited in several districts | Rapid industrialisation + agriculture |
| Delhi NCR | Declining rapidly | Urban extraction; inadequate recharge |
CGWB (Central Ground Water Board) — premier national body under Ministry of Jal Shakti for groundwater assessment, management and regulation.
Atal Bhujal Yojana (Atal Jal) — Original Framework
- Launched: 25 December 2019 (95th birth anniversary of Atal Bihari Vajpayee).
- Implemented in 7 states: Gujarat, Haryana, Karnataka, Madhya Pradesh, Maharashtra, Rajasthan, Uttar Pradesh.
- Focus: community-led, participatory groundwater management in water-stressed areas.
- Originally covered 8,562 Gram Panchayats across 80 districts.
- Funded by World Bank (50%, ₹3,000 cr) and Government of India (50%, ₹3,000 cr) — total ₹6,000 cr.
- Key innovation: Water Security Plans (WSPs) prepared at Gram Panchayat level; demand-side management.
- (Updated implementation status under "Recent Developments" section below.)
Inter-State River Disputes
Constitutional framework: Article 262 of the Constitution empowers Parliament to provide for adjudication of disputes relating to use, distribution or control of inter-state rivers. The Inter-State River Water Disputes (ISRWD) Act, 1956 establishes the mechanism for Tribunals.
Key Tribunals and Awards
| Dispute | States | Tribunal | Key Award |
|---|---|---|---|
| Cauvery (Kaveri) | Karnataka, Tamil Nadu, Kerala, Puducherry | Cauvery Water Disputes Tribunal | Final award (Feb 2007): Tamil Nadu — 404.25 TMC, Karnataka — 284.75 TMC, Kerala — 30 TMC, Puducherry — 7 TMC; Supreme Court upheld in Feb 2018; Cauvery Water Management Authority constituted June 2018 |
| Krishna | AP, Telangana, Maharashtra, Karnataka | Krishna Water Disputes Tribunal I (1969) and II | Bifurcation of AP/Telangana made re-adjudication necessary |
| Narmada | MP, Gujarat, Rajasthan, Maharashtra | Narmada Water Disputes Tribunal | Final Award 1979 — SSP dam height fixed; disputes over raising height continued |
| Ravi-Beas | Punjab, Haryana, Rajasthan | Eradi Tribunal (1986) | Haryana awarded 3.5 MAF; Sutlej-Yamuna Link (SYL) canal controversy — Punjab legislature cancelled agreement; SC ordered construction; politically unresolved |
| Mahadayi | Goa, Karnataka, Maharashtra | Mahadayi Water Disputes Tribunal | Karnataka seeks diversion for Malaprabha basin; Goa opposes; award 2018 |
New ISRWD (Amendment) Act 2019 — inter-state river disputes to be adjudicated by a single permanent tribunal with benches, replacing the system of individual tribunals.
International Water Treaties
Indus Waters Treaty (IWT), 1960
- Signed at Karachi on 19 September 1960 by Indian PM Jawaharlal Nehru and Pakistani President Ayub Khan, brokered by the World Bank.
- Allocation:
- Eastern rivers (Ravi, Beas, Sutlej) → India (unrestricted use)
- Western rivers (Indus, Jhelum, Chenab) → Pakistan (unrestricted use; India has limited run-of-river use rights)
- India uses ~20% of total Indus system water; Pakistan ~80%.
- A Permanent Indus Commission (one Commissioner from each side) meets annually.
- The Treaty survived two wars (1965, 1971) — considered one of the world's most successful water-sharing agreements.
- India suspended the IWT on 23 April 2025 following the Pahalgam terror attack (22 April 2025) — a significant diplomatic and legal development. India began restricting flows on the Chenab from the Baglihar Dam and conducted off-season flushing operations at Salal and Baglihar dams. The treaty contains no explicit suspension clause; Article XII allows modification only by mutual agreement.
Ganga Waters Treaty, 1996 (India–Bangladesh)
- Governs sharing of Ganga waters at Farakka — India built Farakka Barrage (1975) to divert flows to Kolkata port (Hooghly).
- Treaty signed in December 1996 for 30 years; allocates minimum guaranteed flows to Bangladesh during dry season (January–May).
Mahakali Treaty, 1996 (India–Nepal)
- Governs joint development of the Mahakali River (Sharda in India), including Sarada Barrage, Tanakpur Barrage and the proposed Pancheshwar Multipurpose Project.
Water Policy Framework
National Water Policy 2012
Key principles:
- Water is a national resource; state governments are trustees.
- Priority order: drinking water → food security → ecology → agriculture → industry
- River basin as the unit of planning.
- Demand management and pricing reforms essential.
- Promotion of water use efficiency and recycling.
- Recognition of ecological flows in rivers.
A revised National Water Policy was under preparation as of 2025.
Jal Jeevan Mission (JJM) — "Har Ghar Jal"
- Launched 15 August 2019 by PM Modi from Red Fort; aims to provide Functional Household Tap Connection (FHTC) to every rural household with potable water (BIS:10500 standard, 55 LPCD).
- Implementing ministry: Department of Drinking Water and Sanitation, Ministry of Jal Shakti.
- Original deadline 2024 — extended to 2028 in Union Budget 2025-26.
- Progress (early 2026): ~15.82 crore rural households (~82%) have FHTC, up from 3.23 crore (16.7%) in August 2019.
- Budget 2025-26 allocation: ₹67,000 crore (revised total outlay since extension is ₹3.6 lakh crore + ₹2.06 lakh crore central share).
- Har Ghar Jal certified states (100%): Goa (first, August 2022), Telangana, Haryana, Gujarat, Punjab, Himachal Pradesh, Uttarakhand, Mizoram; UTs: A&N Islands, Puducherry, D&NH and Daman & Diu.
- Challenges: Functional water supply (regular, safe, adequate) achieved in ~75% of connected households; sustainability of source aquifers; O&M handover to Gram Panchayat-Village Water & Sanitation Committees (Pani Samitis).
Atal Bhujal Yojana (Atal Jal) — Updated Status
- Launched 25 December 2019; extended to September 30, 2026 (from original 2025 closure); proposal under consideration for further extension to 2027.
- Implemented in 7 priority states: Haryana, Gujarat, Karnataka, Madhya Pradesh, Maharashtra, Rajasthan, Uttar Pradesh.
- Covers 8,213 water-stressed Gram Panchayats in 80 districts (revised from 8,562).
- 50% World Bank loan + 50% Government of India; total outlay ₹6,000 crore.
- Demand-side, community-led; Water Security Plans at GP level.
Jal Shakti Abhiyan (Annual since 2019)
- Annual time-bound campaign in identified water-stressed districts/blocks.
- 2024 theme: "Catch the Rain — Where it falls, When it falls"; integrated with Mission Amrit Sarovar.
- 5 focus areas: rainwater harvesting & water conservation, renovation of traditional water bodies/tanks, reuse of water, watershed development, intensive afforestation.
Interlinking of Rivers (ILR) — National Perspective Plan
The National Perspective Plan (NPP) of 1980 by the Ministry of Water Resources envisaged transferring water from surplus to deficit basins through 30 inter-basin links — 14 Himalayan links (under Himalayan Rivers Development) and 16 Peninsular links (under Peninsular Rivers Development). The National Water Development Agency (NWDA) was created in 1982 to prepare feasibility reports.
| Link | Status | Key Facts |
|---|---|---|
| Ken-Betwa Link Project (KBLP) | Foundation laid 25 December 2024 by PM Modi | First ILR project under NPP; ₹44,605 cr; Daudhan Dam (77 m) on Ken in Panna, MP; transfers ~1,074 MCM from Ken to Betwa; benefits Bundelkhand (UP+MP) — irrigation 10.62 lakh ha, drinking water for 62 lakh people, 103 MW hydropower; submergence affects parts of Panna Tiger Reserve (~58 sq km) — clearances after CEC review |
| Parbati-Kalisindh-Chambal (PKC) Link | Modified PKC (PKC-ERCP) — MoU signed January 2024 | Integrates with Eastern Rajasthan Canal Project (ERCP); Rajasthan-MP joint project |
| Damanganga-Pinjal Link | DPR completed | Mumbai's drinking water supply (Maharashtra-Gujarat) |
| Par-Tapi-Narmada Link | DPR completed; tribal opposition | Surplus from Western Ghats (Par, Auranga, Ambika) to Narmada |
| Mahanadi-Godavari Link | Pre-feasibility | Surplus Mahanadi water to deficit Godavari basin |
| Godavari (Polavaram)-Krishna Link | Operational since 2015 (Pattiseema Lift Scheme) | First operational inter-basin link in India |
Key Concepts
| Concept | Explanation |
|---|---|
| Virtual Water Trade | When India exports water-intensive products (rice, sugar), it "exports" the water embedded in them — a net drain in a water-scarce country |
| Water Footprint | Total volume of freshwater used to produce a good/service |
| Waterlogging | Excess irrigation raises water table; soil becomes saturated; roots suffocate — a major issue in canal-irrigated Punjab/Haryana |
| Salinisation | Evaporation of irrigation water leaves salts behind; renders soil infertile — the Indira Gandhi Canal belt faces this |
| Ecological flows | Minimum river flow needed to maintain river ecosystem health |
Exam Strategy
- Water availability figures: utilisable 1,137 BCM (690 surface + 447 groundwater) — cite CWC data, not just approximations.
- Hirakud = longest earthen dam (world); Tehri = one of world's tallest dams. These are commonly mixed up in prelims.
- Atal Bhujal Yojana covers 7 states (not 5 as sometimes stated) — verify: Gujarat, Haryana, Karnataka, MP, Maharashtra, Rajasthan, UP.
- Indus Waters Treaty rivers: Eastern (Ravi, Beas, Sutlej) → India; Western (Indus, Jhelum, Chenab) → Pakistan. A classic prelims question.
- Cauvery award figures: Tamil Nadu 404.25 TMC, Karnataka 284.75 TMC — these specific numbers have been tested.
- Article 262 + ISRWD Act 1956 for constitutional basis of river disputes. Know the 2019 amendment (single permanent tribunal).
- For Mains GS3 (Environment/Agriculture links): discuss groundwater depletion + MSP policy incentivising water-intensive crops (paddy in Punjab) — a classic integrated question.
Previous Year Questions (PYQs)
Recent Developments (2024–2026)
Jal Jeevan Mission — Progress and Extension
The Jal Jeevan Mission (JJM), launched in 2019 to provide Functional Household Tap Connections (FHTC) to every rural household by 2024, achieved significant milestones but faced delays in some states. As of early 2025, JJM provided tap water connections to approximately 15 crore (150 million) rural households — up from 3.23 crore in 2019. However, the scheme was extended to ensure 100% functional connections. Groundwater recharge efforts under the Atal Bhujal Yojana (2019) showed results: in 2024, total annual groundwater recharge increased by 15 BCM and extraction decreased by 3 BCM compared to the 2017 Central Ground Water Board assessment — signalling early signs of recovery in some over-exploited aquifers.
UPSC angle: JJM progress, groundwater crisis (NITI Aayog's warning of 21 major cities running out by 2030), Atal Bhujal Yojana, and India's per-capita water availability (~1,544 cubic metres in 2024, falling toward "water-scarce" threshold of 1,000) are critical GS3 water governance topics.
Ken-Betwa River Link — First Under National Perspective Plan
The Ken-Betwa Link Project (KBLP) was formally launched with the PM laying the foundation stone on December 25, 2024. This is India's first river interlinking project under the 1980 National Perspective Plan (which identified 30 inter-basin link proposals). The project will divert ~1,200 million cubic metres of water from the Ken River basin to the Betwa basin, creating irrigation potential of 10.62 lakh hectares, providing drinking water to 62 lakh people, and generating 103 MW of hydropower. The project involves construction of the Daudhan Dam in Panna, Madhya Pradesh, which will partially submerge Panna Tiger Reserve — the key environmental concern that had held up clearances for over a decade.
UPSC angle: River interlinking, India's water availability statistics, inter-state water disputes, the Ken-Betwa project's costs and benefits, and Panna Tiger Reserve's ecological sensitivity are core GS1 and GS3 examination themes.
Prelims
- (2021) Consider the following rivers: Barak, Lohit, Subansiri. Which of these has its source within India? (tests knowledge of river origins)
- (2019) With reference to Indus Waters Treaty, consider the following statements — identify correct ones (eastern/western river allocation frequently tested)
- (2018) Which of the following statements about Hirakud Dam is correct? (location, river — Mahanadi, longest earthen dam)
- (2020) Consider the following: 1. SYL Canal 2. Cauvery Water Management Authority — associated with inter-state water disputes
- (2016) With reference to National Water Policy, identify correct statements (priority order, demand management)
Mains
- (2019, GS3) Water is essential for food security. Discuss the challenges of groundwater depletion in India and suggest sustainable management strategies. (15 marks)
- (2021, GS1) Discuss the factors responsible for inter-state water disputes in India. With reference to any two disputes, examine the resolution mechanisms. (15 marks)
- (2018, GS2) The Indus Waters Treaty has survived several Indo-Pakistani crises. Examine its significance as a model of transboundary water sharing and its recent challenges. (15 marks)
- (2022, GS3) "India's irrigation paradox — expanding coverage but declining efficiency." Critically analyse with reference to canal, groundwater and micro-irrigation systems. (15 marks)
