Irrigation in India
Irrigation in India
India has the largest irrigated area in the world (about 68.4 million hectares net irrigated area). However, only about 52% of agricultural land is irrigated, making a large portion of agriculture dependent on monsoon rainfall. Major irrigation sources include canals, wells, tubewells, and tanks.
Key Dates
About 68.4 million hectares — largest in the world; only 52% of cropped area is irrigated
About 62% of irrigation comes from wells/tubewells; India is world's largest groundwater user (25% of global)
Provide about 24% of irrigation — dominant in Punjab, Haryana, UP, Rajasthan
Provide about 3% of irrigation — traditional system dominant in Tamil Nadu, Karnataka, AP
Grand Anicut (Kallanai) on Kaveri — one of oldest water-diversion structures in the world (originally 2nd century AD, rebuilt by British)
Damodar Valley Corporation (DVC) — India's first multipurpose river valley project, modelled on TVA (USA)
Bhakra-Nangal Dam completed on Sutlej — called "Temple of Resurgent India" by Nehru
AIBP (Accelerated Irrigation Benefit Programme) — fast-tracks completion of ongoing irrigation projects
PMKSY launched — "Har Khet Ko Paani" and "Per Drop More Crop"; umbrella irrigation scheme
Atal Bhujal Yojana — community-led groundwater management in 7 states; World Bank-supported
Ken-Betwa Link Project approved — first river interlinking project; connects MP and UP
Highest gravity dam in India (226 m) on Sutlej River; Gobind Sagar reservoir
Highest dam in India (260.5 m) on Bhagirathi; earth-and-rockfill type
Longest dam in India (25.8 km including dykes) on Mahanadi, Odisha
World's longest canal (649 km); brings Sutlej-Beas water from Harike Barrage to Thar Desert
Sources of Irrigation in India
India's irrigation comes from four main sources: (1) Wells and Tubewells (groundwater) — about 62% of net irrigated area; dominant in Punjab, Haryana, UP, Gujarat, Rajasthan, Tamil Nadu, Maharashtra; India is the largest groundwater user in the world, extracting about 25% of global groundwater (about 245 billion cubic metres/year); tubewells became dominant after the Green Revolution (1960s-70s) when high-yielding varieties required assured water supply; over-extraction has led to declining water tables — Punjab water table falls 0.5-1 m/year, Rajasthan and Tamil Nadu face critical stress; Central Ground Water Board (CGWB) assesses and monitors groundwater resources; Central Ground Water Authority (CGWA) regulates extraction in notified areas. (2) Canals — about 24% of irrigation; two types: inundation canals (flood-dependent, seasonal, no headworks — traditional, declining) and perennial canals (from dams/barrages, year-round water — modern, dominant); canal irrigation is dominant in Punjab, Haryana, UP (western), Rajasthan, AP, Karnataka; major canal systems: Indira Gandhi Canal (world's longest, 649 km, brings Sutlej-Beas water from Harike Barrage to Thar Desert in Rajasthan — has transformed arid lands into agricultural areas), Upper Ganga Canal (from Haridwar, built by British in 1854), Sirhind Canal (Punjab), Buckingham Canal (coastal AP-TN — navigation + irrigation). (3) Tanks — about 3%; traditional surface water harvesting structures; dominant in Tamil Nadu (~39,000 tanks/eris), Karnataka, AP, Telangana, Kerala; tank irrigation has declined from ~17% in 1950 to ~3% now due to silting, encroachment, and neglect; tank-fed agriculture is being revived through Mission Kakatiya (Telangana — tank restoration), Kudimaramathu (TN — community repair). (4) Other sources (about 11%) — sprinkler and drip/micro-irrigation, lift irrigation, check dams, percolation ponds, rooftop harvesting.
Major Dams and Multipurpose River Valley Projects
India has over 5,700 large dams (4th largest number globally after China, US, and India). Major dams: Tehri Dam (Bhagirathi, Uttarakhand — highest dam in India at 260.5 m; earth-and-rockfill type; reservoir capacity 3.54 billion cubic metres); Bhakra-Nangal Dam (Sutlej, HP-Punjab border — highest gravity dam at 226 m; Gobind Sagar reservoir, 9.34 billion cubic metres; called "Temple of Resurgent India" by Nehru); Hirakud Dam (Mahanadi, Odisha — longest dam in India at 25.8 km including dykes; first major multipurpose post-Independence dam, completed 1957); Sardar Sarovar Dam (Narmada, Gujarat — 163 m; one of largest concrete gravity dams; controversial — Narmada Bachao Andolan led by Medha Patkar; Statue of Unity nearby); Nagarjuna Sagar Dam (Krishna, Telangana-AP border — one of world's largest masonry dams; irrigates both states); Mettur Dam (Kaveri, Tamil Nadu — completed 1934; Stanley Reservoir; critical for TN's delta irrigation); Tungabhadra Dam (Karnataka-AP border — irrigates Raichur and Bellary); Indira Sagar Dam (Narmada, MP — largest reservoir by volume in India); Koyna Dam (Krishna tributary, Maharashtra — caused reservoir-induced earthquake in 1967). Multipurpose projects serve irrigation, hydropower, flood control, navigation, fisheries, drinking water: Bhakra-Nangal (Sutlej), DVC (Damodar — first multipurpose project, 1948, modelled on TVA), Hirakud (Mahanadi), Nagarjuna Sagar (Krishna), Rihand (Son, UP), Koyna (Maharashtra), Beas Project (HP), Tehri (Uttarakhand), Narmada Valley Development Project (multiple dams — Sardar Sarovar, Indira Sagar, Omkareshwar). Jawaharlal Nehru called dams "Temples of Modern India." Criticism: displacement (Sardar Sarovar displaced 40,000+ families), environmental damage, siltation reducing reservoir life, seismicity (Koyna), cost and time overruns.
Groundwater Crisis and Management
India faces a severe groundwater crisis: India uses about 245 billion cubic metres of groundwater annually — 25% of global extraction, more than the US and China combined. About 1,186 of 6,881 assessment units are "over-exploited" (extraction exceeds recharge), concentrated in Punjab, Haryana, Rajasthan, Delhi, Tamil Nadu, and parts of UP, Karnataka, Maharashtra. In Punjab, the water table has fallen by 20+ metres in some districts over three decades; free electricity for agricultural pumpsets incentivises over-extraction. The Green Revolution's emphasis on water-intensive crops (rice-wheat) in semi-arid regions (Punjab, Haryana) exacerbated the crisis. Consequences: (1) Falling water tables requiring ever-deeper borewells (increasing energy costs), (2) Arsenic contamination in shallow aquifers (West Bengal, Bihar, UP — affects 50+ million people; WHO guideline: <10 ppb), (3) Fluoride contamination (Rajasthan, Gujarat, Andhra Pradesh, Tamil Nadu — causes fluorosis), (4) Saline intrusion in coastal aquifers (Gujarat, TN coast — seawater enters depleted freshwater aquifers), (5) Land subsidence (Joshimath, Uttarakhand — though primarily geological, groundwater extraction contributes). Management measures: Atal Bhujal Yojana (2020, Rs 6,000 crore) — community-led groundwater management in 7 states with World Bank support; incentivises states/communities to improve groundwater management through reward payments; CGWA notifications — declaring over-exploited areas as notified zones where new borewells require NOC; Managed Aquifer Recharge (MAR) — injecting surplus surface water into aquifers; artificial recharge through percolation ponds, check dams, recharge wells; Jal Shakti Abhiyan (2019) — campaign for water conservation in 256 water-stressed districts; National Aquifer Mapping and Management Programme (NAQUIM) — mapping all major aquifers to understand recharge potential; crop diversification — shifting from rice to less water-intensive crops (millets, pulses, oilseeds); Participatory Groundwater Management (PGWM) in Andhra Pradesh — community-based monitoring and regulation.
Interstate Water Disputes
India's federal structure creates complex interstate water-sharing disputes. Major disputes: (1) Kaveri (Cauvery) — Karnataka vs Tamil Nadu (also Kerala, Puducherry); TN as lower riparian state demands water for delta irrigation, Karnataka claims growing needs for Bengaluru; Kaveri Water Disputes Tribunal (1990) gave final award in 2007; Supreme Court modified in 2018: Karnataka 284.75 TMC, TN 404.25 TMC, Kerala 30 TMC, Puducherry 7 TMC; Kaveri Water Management Authority and Kaveri Water Regulation Committee set up. (2) Krishna — Maharashtra vs Karnataka vs Andhra Pradesh vs Telangana; two tribunals (Bachawat and Brijesh Kumar); after Telangana's formation (2014), the dispute became more complex; allocation: Maharashtra 585 TMC, Karnataka 734 TMC, AP 811 TMC. (3) Sutlej-Yamuna Link Canal (SYL) — Punjab vs Haryana; Punjab refuses to complete the canal to share Ravi-Beas water with Haryana; Punjab passed a law denotifying SYL canal land (2004, struck down by SC); the dispute is politically charged and unresolved. (4) Mahanadi — Odisha vs Chhattisgarh; Odisha alleges Chhattisgarh is building barrages reducing downstream flow; tribunal constituted in 2018. (5) Narmada — Gujarat vs MP vs Maharashtra vs Rajasthan; Narmada Water Disputes Tribunal (1969) gave award in 1979; Sardar Sarovar Dam was controversial. Legal framework: Interstate River Water Disputes Act 1956 (amended 2002) — Central government constitutes tribunals for adjudication; decisions binding on parties; Inter-State River Water Disputes (Amendment) Bill 2019 proposes a single permanent tribunal replacing ad hoc ones; Article 262 of the Constitution empowers Parliament to adjudicate interstate river disputes and exclude jurisdiction of courts.
Irrigation Challenges — Waterlogging, Salinity, and Siltation
Major challenges facing Indian irrigation: (1) Waterlogging — occurs when the water table rises to within 2 metres of the surface due to excessive canal irrigation and seepage; about 8.5 million hectares are waterlogged; most severe in Punjab, Haryana (canal-irrigated areas), parts of UP, Rajasthan, and Bihar; effects: root zone becomes saturated, crops die, breeding ground for mosquitoes (malaria/dengue risk); remediation: improved drainage (surface and subsurface drains), conjunctive use (using groundwater and surface water together — pumping groundwater lowers water table while reducing surface irrigation). (2) Salinity/Alkalinity (Usar/Reh/Kallar) — over-irrigation causes evaporation that leaves salt deposits on the surface; about 7 million hectares affected; creates white encrustation that makes land unproductive; most severe in Punjab, Haryana, UP (Gangetic plain), Gujarat; remediation: addition of gypsum (for alkaline/sodic soils), improved drainage, leaching (washing salts below root zone with excess water), cultivation of salt-tolerant crops (barley, cotton). (3) Siltation of Reservoirs — sediment carried by rivers accumulates in reservoirs, reducing storage capacity over time; India's reservoirs are losing capacity at about 0.5-1% per year; Bhakra's Gobind Sagar has lost significant capacity; Hirakud has lost about 30% in 60 years; causes: deforestation in catchment areas increases erosion; remediation: catchment area treatment (afforestation, check dams), de-silting (expensive), raising dam height. (4) Inequality in irrigation — irrigation is concentrated in a few states: Punjab (99% irrigated), Haryana (90%+), while Jharkhand (<20%), Assam (<20%), and NE states have very low irrigation coverage; the disparity mirrors agricultural productivity differences. (5) Inefficiency — flood/surface irrigation (80%+ of irrigated area) wastes 60-70% of water; conveyance losses in unlined canals are 30-40%; only 5-6% of irrigated land uses micro-irrigation despite India's National Water Mission targeting 20% improvement in efficiency.
Government Schemes for Irrigation Development
Key government irrigation initiatives: (1) PMKSY (Pradhan Mantri Krishi Sinchayee Yojana, 2015) — umbrella scheme merging multiple earlier programmes; four components: (a) AIBP (Accelerated Irrigation Benefit Programme) — fast-tracks completion of 99 ongoing major/medium irrigation projects to create new irrigation potential; (b) Har Khet Ko Paani — extending irrigation coverage through minor irrigation, groundwater development, watershed management; (c) Per Drop More Crop — promoting micro-irrigation (drip and sprinkler); targets bringing additional area under micro-irrigation; provides subsidies (up to 55% for small/marginal farmers, 45% for others); (d) Watershed Development — integrated watershed management for rainfed areas. (2) Atal Bhujal Yojana (2020) — Rs 6,000 crore World Bank-supported project for community-led groundwater management in 7 states (Gujarat, Haryana, Karnataka, Madhya Pradesh, Maharashtra, Rajasthan, UP) covering 8,220 Gram Panchayats in 229 blocks; incentivises states through Disbursement Linked Indicators (DLIs) — performance-based rewards for improving groundwater management. (3) National Water Mission (under NAPCC, 8 missions) — aims for 20% improvement in water use efficiency; promotes water conservation, recycling, and demand management. (4) Jal Shakti Abhiyan (2019) — campaign mode initiative for water conservation in 256 water-stressed districts; focus areas: water conservation, rainwater harvesting, renovation of traditional water bodies, bore well recharge, watershed development. (5) Dam Rehabilitation and Improvement Project (DRIP) — World Bank-assisted project to rehabilitate 223 dams in 7 states; Phase II (DRIP-2) covers 736 dams across 19 states/UTs; improves dam safety and restores storage capacity. (6) Pradhan Mantri Kisan Urja Suraksha evam Utthaan Mahabhiyan (PM-KUSUM) — promotes solar energy in agriculture; three components: solar pumps (standalone and grid-connected), solarisation of existing grid-connected pumps, and feeder-level solarisation.
Traditional and Indigenous Irrigation Methods
India has a rich tradition of water harvesting and irrigation systems developed over centuries: (1) Kuhls (Himachal Pradesh) — gravity-fed irrigation channels diverting water from mountain streams to terraced fields; managed by community (Kohli — water master); some kuhls are 300+ years old. (2) Johads (Rajasthan) — earthen check dams that capture rainwater; revived by Rajendra Singh (Waterman of India, Ramon Magsaysay Award 2001) and Tarun Bharat Sangh NGO; over 10,000 johads built, reviving 1,000+ villages and 5 rivers. (3) Tanks/Eris (Tamil Nadu, Karnataka, AP, Telangana) — traditional surface water harvesting structures; Tamil Nadu has ~39,000 tanks; tank-cascade systems connect multiple tanks; provide irrigation, groundwater recharge, flood control, and fisheries; declining due to silting, encroachment, and urbanisation; Mission Kakatiya (Telangana) restored 46,000+ tanks. (4) Virdas (Gujarat, Kutch) — shallow wells in low-lying areas that harvest rainwater; used by pastoral communities; lined with local materials. (5) Zabo system (Nagaland) — impounding rainwater from forested hilltops and channeling it through terraced fields to livestock ponds; integrates forestry, agriculture, and animal husbandry. (6) Bamboo drip irrigation (Meghalaya) — indigenous micro-irrigation; Khasi and Jaintia tribes use bamboo pipes to channel water from mountain springs to betel leaf and black pepper plantations; 18-20 litres/minute through an intricate network of bamboo channels of varying diameters; recognised as an indigenous drip irrigation method. (7) Phad system (Maharashtra, Tapi basin) — community-managed diversion-based irrigation; bandharas (check dams) on rivers divert water into canals; managed by Phad committees. (8) Ahar-Pyne system (Bihar, south Bihar) — traditional floodwater harvesting; pynes (artificial channels) divert river water to ahars (catchment basins/embanked fields); extensive in Gaya, Aurangabad districts. (9) Surangams (Kerala, Kasaragod district) — horizontal tunnels (40-300 m) dug into laterite hills to tap water-bearing layers; provides year-round water even in dry months. (10) Kul/Kuhl system (Ladakh, Spiti) — channels diverting glacial meltwater to fields; critical for agriculture in the cold desert where rainfall is <100 mm; managed by community appointment of Churpun (water manager). These systems embody principles of sustainability, community management, and adaptation to local ecology — and are increasingly recognised as solutions to India's water crisis.
Modern Irrigation Technologies — Micro-Irrigation
Modern irrigation methods offer significant water savings compared to flood irrigation: (1) Drip Irrigation — delivers water directly to plant root zones through a network of pipes, emitters, and drippers; saves 30-60% water compared to flood irrigation; ideal for widely-spaced crops: orchards, plantation crops (coconut, mango, citrus), vegetables, cotton, sugarcane; Israel pioneered this technique (Netafim, founded 1965); in India, Gujarat, Rajasthan, Maharashtra, Karnataka, AP, and Telangana lead in drip adoption; Jain Irrigation (Jalgaon, Maharashtra) is India's largest drip irrigation company and one of the world's largest. (2) Sprinkler Irrigation — distributes water through pressurised pipes and nozzles, simulating rainfall; suitable for closely-spaced crops (wheat, pulses, groundnut), sandy soils where water percolates quickly, and undulating terrain; saves 20-30% water; types: portable, semi-permanent, permanent. (3) Centre-pivot Irrigation — rotating sprinkler system creating circular irrigated areas; used in large farms; mainly in India's corporate farming areas. (4) Subsurface Drip Irrigation (SDI) — drip lines buried below the soil surface; prevents evaporation losses; more efficient but higher installation cost. India's micro-irrigation status: total area under micro-irrigation has reached about 14.3 million hectares (2023) — about 21% of irrigated area; target under PMKSY is to bring additional 10 million hectares under micro-irrigation; the Per Drop More Crop component provides subsidies of 55% for small/marginal farmers, 45% for others; Tamil Nadu leads in micro-irrigation adoption (about 35% of irrigated area), followed by Rajasthan, Gujarat, Karnataka, Maharashtra, AP. Benefits beyond water saving: fertiliser use reduction (fertigation — mixing fertiliser with drip water), higher yields (10-30% increase), reduced labour, lower weed growth. Challenges: high initial cost (Rs 40,000-1,00,000 per hectare for drip), clogging of emitters in hard water areas, maintenance requirements, small landholdings make adoption difficult, and farmer resistance to change.
Major Canal Systems of India
India's canal systems have been developed over centuries: (1) Indira Gandhi Canal (IGNP — Indira Gandhi Nahar Pariyojana) — world's longest canal at 649 km (main canal) with a total network of 9,060 km including distribution system; originates from Harike Barrage at the confluence of Sutlej and Beas rivers in Punjab; carries water to the Thar Desert in Rajasthan (Jaisalmer, Barmer, Bikaner, Ganganagar, Jodhpur districts); has transformed arid land into productive agriculture (wheat, cotton, mustard); irrigates about 15.4 lakh hectares; also provides drinking water to desert towns; challenges: waterlogging, salinity in command area, sand deposition. (2) Upper Ganga Canal — built by British engineer P.L. Tandon and opened in 1854; starts from Haridwar; one of India's oldest modern canal systems; irrigates western UP. (3) Lower Ganga Canal — starts from Narora Barrage; irrigates eastern UP. (4) Sirhind Canal — takes water from Bhakra system; irrigates Punjab and Haryana. (5) Eastern Yamuna Canal and Western Yamuna Canal — originate from Tajewala Barrage/Hathnikund Barrage on Yamuna; irrigate Haryana and western UP. (6) Buckingham Canal — along the east coast from Vijayawada to Villupuram (TN); built in 1806; serves both irrigation and navigation; now largely silted. (7) Krishna-Godavari Delta canals — extensive system in coastal AP/Telangana; built by Sir Arthur Cotton in 1852 (Grand Anicut/Dowlaiswaram Barrage on Godavari); Cotton is revered as "Father of Irrigation" in South India. (8) Periyar Canal system — brings water from Periyar River (Kerala) through a tunnel to Vaigai basin (TN); built 1895; a remarkable engineering feat. (9) Narmada Canal (Gujarat) — from Sardar Sarovar Dam; the main canal is 458 km; irrigates north Gujarat, Saurashtra, and Kutch; part of the Gujarat "green revolution" in arid areas. Types: major (cultivable command area > 10,000 hectares), medium (2,000-10,000 hectares), minor (<2,000 hectares). India's command area development programme aims to improve water distribution efficiency in canal commands — lining canals to reduce seepage losses, rotational water supply, and participatory irrigation management (Water Users Associations — WUAs).
National River Interlinking Project
The National River Interlinking Project (NRLP) is an ambitious plan to connect 30 rivers through 30 links (14 Himalayan links and 16 Peninsular links) using about 15,000 km of canals to transfer water from surplus basins (those with more water than they need) to deficit basins (those with less). Origin: K.L. Rao's proposal (1972) for Ganga-Kaveri link; Captain Dastur's garland canal concept; National Water Development Agency (NWDA) established in 1982 to prepare feasibility reports. The rationale: India receives 4,000 billion cubic metres of precipitation but utilises only about 1,123 billion cubic metres; northern rivers (Ganga, Brahmaputra) have surplus water causing floods, while southern/western rivers (Kaveri, Krishna, Godavari, Narmada) face deficits causing droughts; interlinking would transfer surplus to deficit areas, irrigating 35 million hectares of additional land, generating 34,000 MW of hydropower, and reducing floods. Ken-Betwa Link Project — the first approved river interlinking project (approved by Cabinet in December 2021); connects Ken River (MP, surplus) to Betwa River (MP-UP, deficit) through a 221 km canal; includes Daudhan Dam (77 m); estimated cost: Rs 44,605 crore; will irrigate 10.62 lakh hectares in Bundelkhand (MP and UP); controversy: submerges part of Panna Tiger Reserve (MP); environmental clearance required forest land diversion. Other proposed links in advanced stages: Par-Tapi-Narmada (Gujarat), Damanganga-Pinjal (Gujarat-Maharashtra), Godavari-Krishna-Pennar-Kaveri (AP-TN). Criticism and challenges: (1) Environmental — mega-infrastructure disrupts river ecosystems, fisheries, wetlands, and riparian habitats; (2) Displacement — dams and canals require massive land acquisition; (3) Scientific — surplus/deficit is based on assumptions that may not hold under climate change; some scientists argue river basins don't have permanent surplus/deficit; (4) Geopolitical — Brahmaputra/Ganga links involve water from rivers shared with Bangladesh and Nepal; (5) Cost — estimated at Rs 5-10 lakh crore; (6) Downstream impacts — reducing flow to deltas affects sediment supply, fisheries, and salinity intrusion; Sundarbans could be affected by Ganga diversion. Alternative approaches: watershed management, rainwater harvesting, groundwater recharge, demand-side management, and crop diversification may be more sustainable.
Lift Irrigation and Mega Projects
Lift irrigation involves pumping water from a lower elevation to a higher elevation to irrigate areas that cannot be served by gravity-flow canals. This is essential for elevated plateau regions of Peninsular India. Major lift irrigation projects: (1) Kaleshwaram Lift Irrigation Project (Telangana) — world's largest multi-stage lift irrigation project; lifts Godavari water from the confluence with Pranahita River; water is lifted through multiple stages to a total height of ~618 m; uses massive pumps; supplies water to 37 districts of Telangana; aims to irrigate 18.25 lakh acres; estimated cost Rs 1+ lakh crore; includes the world's largest underground pumping station at Gayatri. (2) Polavaram Project (Andhra Pradesh) — multipurpose project on Godavari River; dam height 48.7 m; declared a National Project; will irrigate 2.91 lakh hectares; provides drinking water to 540 villages; will submerge about 276 villages and displace 100,000+ people (mainly tribals); controversy over environmental and rehabilitation issues. (3) Sardar Sarovar Project (Gujarat) — includes the Narmada main canal (458 km) and a network reaching Kutch and Saurashtra; Gujarat has extensively used lift irrigation from the Narmada canal to irrigate elevated areas of north Gujarat and Saurashtra that the main canal cannot reach by gravity. (4) Devadula Lift Irrigation (Telangana) — lifts Godavari water to irrigate parts of Warangal and Karimnagar districts. (5) Upper Krishna Project (Karnataka) — includes multiple dams and canals on the Krishna River; Almatti and Narayanpur dams; lift component irrigates elevated areas. (6) Mahatma Jyotirao Phule Lift Irrigation (Maharashtra) — lifts water from the Krishna River to irrigate Marathwada (Solapur, Osmanabad, Latur districts), one of the most drought-prone regions in India. The growing trend of mega lift irrigation reflects the fact that gravity-based irrigation has limited reach in Peninsular India — plateau topography requires lifting water. However, energy costs are significant (Kaleshwaram's pumping consumes enormous electricity), and questions remain about long-term economic viability and environmental sustainability.
Irrigation and the Green Revolution
The Green Revolution (1960s-70s) fundamentally transformed Indian irrigation. Before the Green Revolution, canal irrigation was the dominant source; afterward, groundwater (wells and tubewells) became dominant due to: (1) New HYV (High Yielding Variety) seeds required assured water supply — farmers couldn't depend on erratic canal supply; tubewells offered on-demand water. (2) Government subsidised diesel and electricity for agricultural pumpsets — in many states, farm electricity became free (Punjab, Tamil Nadu, AP), incentivising groundwater extraction. (3) Tube-well technology became affordable — submersible pumps allowed deep drilling. Impact on irrigation: irrigated area increased from 22.6 million hectares (1950-51) to 68.4 million hectares; food grain production increased from 51 million tonnes (1950-51) to 315+ million tonnes; India became food self-sufficient. However, the irrigation revolution was geographically concentrated: Punjab, Haryana, and western UP became the "grain bowl" — rice-wheat cropping system dependent on canal (Bhakra-Nangal) and tube-well irrigation; these states achieved near-complete irrigation (Punjab 99%, Haryana 90%+). Eastern India (Bihar, Jharkhand, eastern UP, West Bengal, Odisha, Assam) — despite having abundant water resources, remained under-irrigated (<30-50%); this "East-West irrigation divide" persists; the Bringing Green Revolution to Eastern India (BGREI) programme addresses this by promoting shallow tubewell installation, farm ponds, and community irrigation. Second Green Revolution priorities: (1) Extending irrigation to eastern India and rainfed regions; (2) Water-use efficiency through micro-irrigation; (3) Conjunctive use of surface and groundwater; (4) Solar-powered irrigation (PM-KUSUM); (5) Crop diversification away from water-intensive rice-wheat towards millets, pulses, and oilseeds — the International Year of Millets 2023 promoted this shift.
Droughts and Rainfed Agriculture
Despite India's large irrigated area, about 48% of net sown area (about 73 million hectares) remains rainfed and dependent entirely on monsoon rainfall. Rainfed agriculture is concentrated in: central India (MP, Chhattisgarh, eastern Rajasthan), Deccan Plateau (Maharashtra's Marathwada and Vidarbha, Karnataka's northern districts, Telangana, parts of AP), eastern India (Jharkhand, Odisha, eastern UP). These regions are vulnerable to drought: India experienced severe droughts in 2002, 2009, 2014, 2015, and 2023 (El Nino-driven). Impact: crop failure, farmer distress (farmer suicides — Vidarbha in Maharashtra has been an epicentre), livestock mortality, migration. Government response: National Rainfed Area Authority (NRAA) advises on rainfed agriculture development; Pradhan Mantri Fasal Bima Yojana (PMFBY, 2016) — crop insurance scheme, provides insurance against crop failure at subsidised premiums (2% for kharif, 1.5% for rabi); using satellite and drone-based assessment for faster claim settlement. Rainfed area strategies: (1) Watershed development — treating catchments as units; contour bunding, check dams, farm ponds, afforestation; PMKSY's watershed component; Comprehensive Watershed Development Programme (COWDEP); World Bank-assisted watershed projects in Maharashtra, Karnataka, AP have shown significant results; (2) Drought-resistant varieties — ICAR has developed drought-tolerant varieties of rice, wheat, maize, and millets; (3) Protective irrigation — constructing farm ponds and micro-storage structures to provide one or two critical irrigations during dry spells; (4) Crop diversification — shifting from water-intensive crops to millets (jowar, bajra, ragi — naturally drought-tolerant), pulses, and oilseeds. The Millet Mission and declaration of 2023 as International Year of Millets (at India's initiative) promoted climate-resilient crops for rainfed areas.
Water Use Efficiency and Irrigation Management
India's irrigation system is characterised by low efficiency: overall irrigation efficiency is about 35-40% (meaning 60-65% of water diverted for irrigation is lost before reaching crop roots). Conveyance efficiency (canal to field) is about 60-70% in lined canals, 40-50% in unlined canals. Application efficiency (field level) is about 50-60% for flood irrigation, 70-80% for sprinkler, 90-95% for drip. Strategies to improve efficiency: (1) Canal lining — reduces seepage losses by 50-80%; India has over 1 lakh km of canals but only a fraction is lined; AIBP and PMKSY fund canal lining. (2) Rotational Water Supply (Warabandi) — distributing canal water in fixed turns to farmers; pioneered in Punjab and Haryana; ensures equitable distribution. (3) Participatory Irrigation Management (PIM) — involving farmers in canal management through Water Users Associations (WUAs); AP was the first state to adopt PIM (AP Farmers Management of Irrigation Systems Act, 1997); WUAs maintain distributaries and allocate water; reduces conflict and improves efficiency. (4) Micro-irrigation — drip and sprinkler systems; India has about 14.3 million hectares under micro-irrigation; PMKSY's Per Drop More Crop component provides subsidies. (5) Laser land levelling — using GPS-guided laser systems to create perfectly level fields, reducing water wastage due to uneven distribution; popular in Punjab, Haryana, UP; saves 10-15% water. (6) System of Rice Intensification (SRI) — growing rice with less water by alternate wetting and drying rather than continuous flooding; reduces water use by 30-50%; promoted in Tripura (Tripura became a model state for SRI, achieving record yields), AP, TN, Bihar. (7) Demand-side management — volumetric water pricing (charging for actual water consumed rather than flat rates per hectare) incentivises conservation; Andhra Pradesh REFORM programme experimented with this. (8) Information technology — real-time soil moisture sensors, weather forecasting, and mobile apps advising farmers on optimal irrigation timing and quantity; ICAR's Automated Weather Stations network feeds into advisories.
Irrigation and Climate Change
Climate change poses profound challenges to India's irrigation systems: (1) Changing monsoon patterns — IPCC projections suggest more intense but fewer rainy days (same or slightly more total rainfall but distributed in fewer extreme events), meaning more floods and droughts; this disrupts canal irrigation which depends on predictable reservoir filling. (2) Glacial retreat — Himalayan glaciers provide 30-50% of dry-season flow for north Indian rivers; retreat will initially increase flows (peak water) but eventually reduce them, particularly the Indus system; irrigation in J&K, Punjab, Haryana, and western UP will be affected. (3) Groundwater recharge — changing rainfall intensity may reduce groundwater recharge (heavy rainfall causes more runoff, less infiltration); deeper water tables in Punjab, Haryana, Rajasthan may become worse. (4) Increased evapotranspiration — rising temperatures increase crop water demand; a 1 degree C rise increases evapotranspiration by 5-15%, meaning more irrigation water is needed. (5) Sea-level rise — will cause saline intrusion into coastal aquifers (Gujarat, TN, Kerala coasts), contaminating freshwater sources. Adaptation strategies: (a) Climate-resilient irrigation infrastructure — designing dams and canals for changed flow patterns; increasing storage capacity; (b) Managed retreat from groundwater — shifting to less water-intensive crops in stressed areas; (c) Solar-powered irrigation — PM-KUSUM promotes solar pumps (reducing both energy costs and emissions); challenge: solar pump without regulation may accelerate groundwater depletion; (d) Water budgeting — estimating water availability at block/taluka level and matching cropping patterns to water availability; (e) Conjunctive use — integrated management of surface water and groundwater to buffer against variability; (f) Nature-based solutions — watershed restoration, wetland conservation, and flood plain management to enhance natural storage and recharge. National Water Policy 2012 recognises climate change as a key challenge and calls for demand management, recycling, and prioritisation of drinking water over irrigation in allocation.
Irrigation Statistics and State-wise Analysis
Key irrigation statistics: India's Net Irrigated Area (NIA): 68.4 million hectares; Gross Irrigated Area (GIA): 97.6 million hectares (some area irrigated more than once); Irrigation Intensity (GIA/NIA): ~142%. Source-wise breakup: Wells/Tubewells ~62%, Canals ~24%, Tanks ~3%, Other sources ~11%. State-wise analysis — Highly irrigated states (>70%): Punjab (99% — highest), Haryana (90%+), Uttar Pradesh (76%), Madhya Pradesh (47% — improving rapidly with Narmada projects). Medium irrigated states (40-70%): Bihar (61%), Tamil Nadu (59%), West Bengal (60%), Rajasthan (42%), Gujarat (50% — transformed by Narmada and groundwater). Low irrigated states (<40%): Jharkhand (10-15%), Assam (15-20%), Meghalaya (<20%), Chhattisgarh (~30%), Odisha (~35%), Maharashtra (~20% — despite being a large state, irrigation coverage is low due to the Deccan trap basalt making groundwater extraction difficult). Source-wise state patterns: Canal-dominated: Punjab (Bhakra-Nangal system), Haryana, western UP, Rajasthan (Indira Gandhi Canal), coastal AP. Groundwater-dominated: Gujarat (tubewells), Tamil Nadu, UP (eastern), Bihar, Maharashtra, Madhya Pradesh. Tank-dominated: Tamil Nadu (declining), Karnataka, Telangana. Per-hectare productivity of irrigated vs rainfed agriculture: irrigated land produces 2-3 times more per hectare than rainfed; productivity of irrigated wheat is ~3,000 kg/hectare vs ~1,200 kg/hectare rainfed. India's irrigation potential utilisation: created irrigation potential is about 126 million hectares but utilised is only about 97 million hectares — the gap reflects incomplete distribution systems and non-functioning infrastructure. Irrigation contributes to about 40% of food grain production from about 48% of net sown area.
Relevant Exams
Irrigation is a high-frequency topic linking geography with economy and current affairs. UPSC tests dam-river associations, interstate water disputes, groundwater challenges, and traditional irrigation methods. SSC/RRB exams ask about longest/highest dams, canal systems, and irrigation sources. PMKSY, river interlinking (Ken-Betwa), Kaleshwaram, water conservation schemes, and micro-irrigation are common in current affairs. The groundwater crisis and climate change impact on irrigation are increasingly asked in UPSC Mains.