Water Resources

Why this chapter matters for UPSC: Water is India's most critical natural resource challenge. UPSC tests water geography in GS1 (river systems, water availability, inter-basin transfer), GS2 (interstate water disputes — Cauvery, Krishna, Ravi-Beas), and GS3 (irrigation policy, water pricing, groundwater regulation, rainwater harvesting, watershed management). India's water crisis — falling groundwater tables, pollution, and inter-state conflicts — makes this a perennially relevant policy topic.

Contemporary hook: India is home to 18% of the world's population but has only 4% of the world's freshwater resources. The NITI Aayog's Composite Water Management Index (2018) warned that 21 major cities (including Delhi, Bengaluru, Chennai, Hyderabad) could run out of groundwater by 2020 — and while the worst predictions haven't fully materialised, the trajectory is deeply concerning. Chennai's 2019 "Day Zero" water crisis — when all four major reservoirs ran dry simultaneously — was a warning shot.

PART 1 — Quick Reference Tables

India's Water Availability

Major River Systems: UPSC Data Points

Water Use Distribution in India

Note: Agriculture's 89% water use makes it the critical target for water efficiency improvements

Major Interstate Water Disputes

PART 2 — Detailed Notes

Surface Water Resources

India's surface water is unevenly distributed — the Ganga-Brahmaputra-Meghna system in the north and east accounts for ~60% of India's river flow, while peninsular rivers (Karnataka, AP, Tamil Nadu) are monsoon-dependent and often run dry in summer.

River water availability vs demand:

• Water-surplus basins: Brahmaputra, Ganga, Mahanadi, Godavari — more water than current local demand
• Water-deficit basins: Cauvery, Krishna, Luni, rivers of Rajasthan — demand exceeds local availability

This geographic mismatch is the rationale for the National River Linking Project (NRLP).

Groundwater: India's Hidden Crisis

Groundwater provides:

• ~63% of irrigation water (tubewells)
• ~85% of rural drinking water
• ~50% of urban water supply

Overextraction: India extracts more groundwater annually than any other country — ~250 BCM/year, vs global recommended sustainable rate of ~180 BCM. In Punjab and Haryana, water tables are falling 0.5–1 metre per year due to paddy cultivation (paddy requires 1,200–1,500 litres per kg vs wheat's 400–800 litres/kg).

Regulated but dysfunctional: India has no comprehensive national groundwater regulation. The Draft National Groundwater Management and Regulation Act has been pending since 2017. The Atal Bhujal Yojana (2019) is a World Bank-funded groundwater management scheme for water-stressed blocks in 7 states.

💡 Explainer: National River Linking Project (NRLP)

The NRLP proposes to transfer water from "surplus" rivers (Ganga, Brahmaputra, Mahanadi, Godavari) to "deficit" rivers (Cauvery, Krishna, rivers of Rajasthan) through a network of canals, tunnels, and reservoirs.

Scale: ~30 river links; ~15,000 km of canals; estimated cost ₹5.5 lakh crore (at 2002 prices — would be many times higher today).

Arguments for NRLP:

• Would provide irrigation to 34 million hectares (additional)
• Generate 34,000 MW hydropower
• Reduce flood damage in surplus basins (Brahmaputra floods)
• Address water deficit in peninsular India and Rajasthan
• Supreme Court (2012) directed government to prepare a "comprehensive study" (T.N. Godavarman vs Union of India context)

Arguments against NRLP:

• Massive displacement — millions of people in river flood plains and wetlands
• Ecological disruption — riverine ecosystems, mangroves, fisheries depend on natural flow
• "Surplus river" concept is flawed — Brahmaputra floods are seasonal; not permanent surplus
• India-Bangladesh relations — Bangladesh objected to Brahmaputra-Ganga link because Brahmaputra feeds Bangladesh's irrigation (Farakka already contested)
• Astronomical cost; long implementation timeline; corruption risk
• Opportunity cost — same money could build 100 million water-harvesting structures

Status: Only Ken-Betwa Link Project (Madhya Pradesh-UP; finalised 2021, construction ongoing) is being implemented among NRLP's 30 links. The rest remain on paper.

Interstate Water Disputes

Cauvery Dispute: The Cauvery basin covers Karnataka (~34%) and Tamil Nadu (~43%) — two states whose agricultural calendars depend on the river. Karnataka built reservoirs (KRS Dam — Krishnaraja Sagar) for irrigation in Mysuru plateau; Tamil Nadu depends on Mettur Dam (Stanley Reservoir) for Cauvery delta (Thanjavur) rice farming.

Core conflict: Karnataka wants more water for Bengaluru's growing urban demand and irrigation expansion; Tamil Nadu argues it has prior rights (historical agreements from 1892 and 1924, British-era agreements between Mysore and Madras).

Current status: Cauvery Water Management Authority (CWMA, 2018) implements the Supreme Court's 2018 award allocating 177.25 TMC to TN, 284.75 TMC to Karnataka (reduced from Tribunal's 270 TMC as Bangalore's domestic use increased allocation to Karnataka).

SYL Canal (Sutlej-Yamuna Link): Punjab's 214 km canal linking Sutlej to Yamuna, to carry Ravi-Beas river water to Haryana and Rajasthan. Canal dug in Haryana but not completed on Punjab's side.

Punjab's position: Punjab has no water to spare; Green Revolution has already depleted groundwater; Haryana's share was based on outdated river flow data. Haryana's position: Punjab is illegally denying its constitutionally allocated share. Supreme Court: Directed Punjab to complete the canal; Punjab's legislature enacted a law terminating water agreements — SC struck it down. Dispute remains unresolved.

Irrigation in India

India has the largest irrigated area in the world (~68 million hectares net irrigated; ~97 million ha gross irrigated). Irrigation sources:

Irrigation efficiency problem: India's average irrigation efficiency is ~35–40% — meaning 60-65% of water diverted for irrigation is lost to evaporation, seepage, and runoff. Drip and sprinkler irrigation (micro-irrigation) achieves 70–90% efficiency.

Pradhan Mantri Krishi Sinchayee Yojana (PMKSY): Launched 2015; tagline "Har Khet Ko Paani, More Crop Per Drop." Aims to expand irrigation coverage, improve water use efficiency, accelerate irrigation project completion.

Accelerated Irrigation Benefits Programme (AIBP): Completes long-pending irrigation projects; funds from central government.

📌 Key Fact: Virtual Water and Food Trade

"Virtual water" concept (John Allan, 1993) calculates the water embedded in traded goods. India exporting rice and sugar is essentially exporting water from water-stressed regions. India exports ~100 BCM of virtual water annually through agricultural exports — in a country with water scarcity. This raises the policy question: should water-intensive crops be grown in water-deficit regions?

Rainwater Harvesting and Traditional Water Management

Traditional systems:

• Johads (Rajasthan) — earthen check dams storing rainwater; Tarun Bharat Sangh's work in Alwar district reviving them
• Stepwells (Vav/Baoli) — Rani ki Vav (Patan, Gujarat — UNESCO World Heritage Site); Chand Baori (Abhaneri, Rajasthan)
• Tank irrigation — South India; thousands of cascade tanks (Odisha, Tamil Nadu, Karnataka); many now derelict
• Zabo (Nagaland) — "impounding run-off" system; contour trenches collect rainwater in paddy fields
• Bamboo drip irrigation (Meghalaya) — traditional tribal system
• Pyne (Bihar) — local canal/diversion systems from hill streams

Modern rainwater harvesting:

• Rooftop rainwater harvesting mandated in many urban building codes (Tamil Nadu, Rajasthan)
• Percolation ponds, check dams for groundwater recharge
• Watershed development — treating a micro-watershed (500–2,000 hectares) as a unit; check dams, contour bunding, vegetative bunds, farm ponds

🎯 UPSC Connect: Watershed Management

India's watershed management programmes (IWMP, NABARD's WADI programme) have shown that treatment of degraded watersheds can:

• Increase groundwater recharge 2–3 fold
• Reduce soil erosion 50–70%
• Increase crop productivity 30–50%
• Reduce rural poverty (more stable water access → better harvests → higher incomes)

Ralegan Siddhi (Maharashtra) — transformed by Anna Hazare's community watershed work in the 1970s-80s — is the most celebrated case: a dryland drought-prone village transformed into a water-secure, prosperous community through check dams, contour trenches, and ban on tree-cutting.

🔗 Beyond the Book: National Water Policy

India's National Water Policy 2012 (a revision of 2002 policy) establishes priorities for water allocation:

1. Drinking water
2. Irrigation for subsistence/food security
3. Other agricultural uses
4. Industrial use
5. Navigation and other uses

Problem: The policy is a statement of principles, not enforceable law. India lacks a National Water Framework Law. Draft frameworks have been proposed but not enacted. The result: each state manages its own water allocation; interstate conflicts; groundwater is a free good for farmers (exploited without charge in most states).

PART 3 — Frameworks and Analysis

Water Conflict Anatomy: Understanding Interstate Disputes

For any interstate water dispute question, cover:

1. Geographic reality — which states share the basin; water flow patterns
2. Historical agreements — pre-independence; colonial-era; earlier tribunal awards
3. Development asymmetry — which state built more infrastructure (dams, canals) vs which has prior-use rights
4. Social/agricultural dependence — which farming communities depend on the river; what crops; what political mobilisation
5. Legal framework — Inter-State River Water Disputes Act (1956); Role of Tribunal; Supreme Court's role
6. Current status — tribunal award; CWMA; pending completion

Three Strategies for Water Security

Exam Strategy

For Prelims: India's annual utilisable water (~1,123 BCM), irrigation's share (~90%), groundwater share of irrigation (~63%). River facts (Ganga length, Brahmaputra basin area). Know Cauvery and SYL disputes. Know Atal Bhujal Yojana, PMKSY.

For Mains GS1: River system facts; water availability vs demand geography; NRLP (for and against). Interstate disputes — Cauvery structure: 4 parties, history, CWMA, SC verdict.

For Mains GS3: Irrigation efficiency (35% vs 70–90% drip); groundwater crisis (Punjab case — Green Revolution link); watershed management (Ralegan Siddhi, Tarun Bharat Sangh); PMKSY; virtual water concept.

For Mains GS2: Interstate water disputes — constitutional provision (Entry 17, State List; Article 262 — Inter-State River Water Disputes Act); institutional mechanism (Tribunal, CWMA).

Previous Year Questions

1. UPSC Mains GS1 2019: "Explain the geographic basis of interstate river water disputes in India. How does the Inter-State River Water Disputes Act address these?" (Core water dispute question)

2. UPSC Mains GS3 2021: "India's groundwater is being exploited unsustainably. Analyse the causes and suggest a comprehensive policy response." (Groundwater crisis)

3. UPSC Mains GS3 2018: "Critically evaluate the National River Linking Project. Is it the solution to India's water woes?" (NRLP debate)

4. UPSC Mains GS3 2022: "Traditional water conservation practices have proven more sustainable than large-scale dam-based irrigation. Discuss with examples." (Traditional systems + watershed)