# India's Water Resources — Rivers, Groundwater, Interlinking & Harvesting (UPSC Geography)

Source: https://tracknation.in/story/india-s-water-resources-rivers-groundwater-interlinking-harvesting-upsc-geography (TrackNation — free UPSC notes with PYQs)

> UPSC Geography notes on India's uneven surface and groundwater distribution, agriculture's dominant share of water demand, groundwater depletion and arsenic/fluoride contamination, river pollution, watershed management (including the Ralegan Siddhi case study) and rainwater harvesting, the National Water Policy 2002, the Jal Kranti Abhiyan, interlinking of rivers, and a currency-verified account of the Indus Waters Treaty's contested 2025-2026 status. Includes four exact real UPSC Mains question

## India's Water Resources & Their Uneven Distribution

🎯 **Exam priority: High-yield (T1).** *This is one of the most Mains-tested topics in the entire syllabus — every major sub-theme here (groundwater decline, interlinking, the freshwater paradox, the Indus Waters Treaty) has its own real, dedicated UPSC Mains question.*

India holds barely 4% of the world's freshwater for nearly a fifth of humanity — a mismatch stark enough that scarcity here isn't really about how much water exists, but where it is and who can reach it.

## India's Water Resources & Their Uneven Distribution

- India receives about **4,000 cubic km** of water annually from precipitation; of this, only **1,869 cubic km** is available as surface water and replenishable groundwater, and just **60%** of that can be put to beneficial use — leaving a genuinely usable resource of only **1,122 cubic km**. Distribution is starkly uneven: the **Ganga, Brahmaputra and Barak** basins cover only about one-third of India's area, yet — thanks to their heavy catchment-area rainfall — hold **60%** of the country's total surface water resources, while much of that water in the Brahmaputra and Ganga basins remains comparatively under-harnessed even today.

- **Groundwater** tells a similarly uneven story: of about **432 cubic km** of total replenishable groundwater, utilisation is very high in **Punjab, Haryana, Rajasthan and Tamil Nadu**, moderate in Gujarat, Uttar Pradesh, Bihar, Tripura and Maharashtra, and comparatively low in Chhattisgarh, Odisha and Kerala.

- Agriculture dominates India's water demand — accounting for **89%** of surface water and **92%** of groundwater utilisation nationally — precisely because rainfall's sharp spatio-temporal variability makes assured irrigation essential even in relatively wet states like West Bengal and Bihar. This is exactly why the **Green Revolution** succeeded so decisively in Punjab, Haryana and western Uttar Pradesh: over **85%** of their net sown area is irrigated, with wells and tubewells alone covering 76.1% of Punjab's and 51.3% of Haryana's net irrigated area.

## Groundwater Depletion & Water Pollution

The very success that made Punjab and Haryana India's breadbasket is now quietly draining the water table beneath them.

## Groundwater Depletion & Water Pollution

- Heavy reliance on wells and tubewells for irrigation has driven a genuine decline in the groundwater table across Punjab, Haryana and western Uttar Pradesh. Over-withdrawal carries its own chemical cost too: excessive groundwater extraction in **Rajasthan and Maharashtra** has raised **fluoride** concentrations, while similar over-use in parts of **West Bengal and Bihar** — squarely within the Gangetic valley — has increased **arsenic** concentration in groundwater, a genuinely serious, ongoing public-health concern tied directly to declining groundwater potential across the Gangetic plain.

- Surface water fares little better. The **Yamuna** is India's most polluted river, especially in its Delhi-to-Etawah stretch; the Sabarmati (Ahmedabad), Gomti (Lucknow), Kali, Adyar, Cooum, Vaigai (Madurai) and Musi (Hyderabad) are also severely polluted, and even the Ganga itself is badly affected at Kanpur and Varanasi. India's **Central Pollution Control Board**, monitoring 507 stations nationally with State Pollution Control Boards, finds organic and bacterial contamination the leading cause. Legislative responses — the Water (Prevention and Control of Pollution) Act 1974, the Water Cess Act 1977, and the Environment Protection Act 1986 — have, by the book's own honest assessment, had only marginal real-world impact so far.

## Water Conservation — Watershed Management & Rainwater Harvesting

One small, drought-hit Maharashtra village turned a single leaking percolation tank into a story now taught in classrooms across the country.

## Water Conservation — Watershed Management & Rainwater Harvesting

- **Watershed management** — conserving and judiciously using land, water and human resources within a watershed — depends heavily on community participation. Government-backed programmes like **Haryali** (executed by Gram Panchayats) and state-level efforts like **Neeru-Meeru** (Andhra Pradesh) and **Arvary Pani Sansad** (Alwar, Rajasthan) have built percolation tanks, check dams and dug-out ponds (johad) through direct people's participation. **Ralegan Siddhi** (Ahmadnagar, Maharashtra) — a village transformed from poverty and illicit liquor trade into a national watershed-development model, in a mitigation effort widely associated with the social activist **Anna Hazare** — remains the textbook case study: voluntary labour repaired a failing percolation tank, open grazing and water-intensive sugarcane cultivation were banned in favour of low-water crops, and the resulting water security transformed the entire local economy.

- **Rainwater harvesting** — capturing and storing rain, often to recharge groundwater aquifers directly — is a low-cost, eco-friendly technique that raises water availability, checks a declining water table, dilutes contaminants like fluoride and nitrates, prevents soil erosion and flooding, and even arrests saltwater intrusion in coastal aquifers. Traditional methods persist across India — Rajasthan's **Kund** or **Tanka** (covered underground tanks) near homes and villages are a classic example — while urban rooftop and open-space harvesting is increasingly promoted precisely because city water demand has already outstripped supply in most towns.

## National Water Policy, Interlinking of Rivers & the Indus Waters Treaty

Solving India's water problem has never really been about finding more water — it has always been about moving it, sharing it, and, increasingly, negotiating over it.

## National Water Policy, Interlinking of Rivers & the Indus Waters Treaty

- India's **National Water Policy, 2002**, sets a clear allocation priority — drinking water first, then irrigation, hydro-power, navigation, and industrial and other uses — while pushing groundwater regulation, regular water-quality monitoring, and public conservation awareness. Building on this, the **Jal Kranti Abhiyan** (2015-16) aims to secure per-capita water availability by designating a water-stressed "Jal Gram" village in each of 672 districts, developing model command areas nationwide, and specifically funding arsenic-free wells in affected regions.

- **Interlinking of rivers** — transferring water from surplus basins to deficit ones via canal links — is one of the most-debated proposed remedies for India's uneven water distribution, pursued through a National Perspective Plan with separate Himalayan and Peninsular components; the **Ken-Betwa Link** is its flagship project. Critics highlight ecological disruption, displacement and enormous cost; supporters point to flood mitigation, drought relief and improved navigation — exactly the "critically examine" framing UPSC itself has used.

- **Current status (verified):** the **Indus Waters Treaty** (1960, brokered by the World Bank) allocates India the three eastern rivers — Ravi, Beas and Sutlej — and Pakistan the three western rivers — Indus, Jhelum and Chenab. Following the 22 April 2025 Pahalgam terror attack, India placed the treaty **"in abeyance"**, stating it will stay suspended until Pakistan "credibly and irrevocably" ends its support for cross-border terrorism; Pakistan disputes that any provision of the treaty allows unilateral suspension, and a Court of Arbitration has separately ruled against India's position, which India in turn rejects as illegitimately constituted — a live, unresolved dispute as of today.

## Further Reading

- Standard NCERT-level geography textbooks and reference books, plus a good atlas (any UPSC reading list).

## Why UPSC Asks This

- The "freshwater paradox" (abundant on paper, scarce in practice) is a genuine, repeatable Mains framing — always explain it through distribution, seasonality and quality, not just raw volume.

- Connect Gangetic-valley groundwater decline directly to food security — the states hit hardest by depletion (Punjab, Haryana, western UP) are also India's staple-grain heartland.

- On interlinking and the Indus Waters Treaty, always present both the case for and the case against — UPSC's own "critically examine" and "implications" framings expect a balanced answer, not an advocacy piece.

## Test Yourself: Practice Questions & PYQs

India's Water Resources practice — surface and groundwater distribution, groundwater depletion and pollution, watershed management and rainwater harvesting, and the National Water Policy, interlinking of rivers and the Indus Waters Treaty.

## Practice Questions

**Q1.** Of India's total annual water availability from surface water and replenishable groundwater, approximately what share can actually be put to beneficial use?

- (a) 95 percent

- (b) 60 percent

- (c) 25 percent

- (d) 40 percent

**Answer: (b)** — Of the 1,869 cubic km available from surface water and replenishable groundwater, only about 60 percent can be put to beneficial use, giving a genuinely utilisable resource of about 1,122 cubic km.

**Q2.** The Ganga, Brahmaputra and Barak river basins cover about one-third of India's area but account for what share of the country's total surface water resources?

- (a) 15 percent

- (b) 60 percent

- (c) 89 percent

- (d) 40 percent

**Answer: (b)** — Despite covering only about one-third of India's total area, the heavily-precipitated Ganga, Brahmaputra and Barak basins hold about 60 percent of the country's total surface water resources.

**Q3.** Over-withdrawal of groundwater in parts of West Bengal and Bihar has been particularly linked to increased concentration of which contaminant?

- (a) Mercury

- (b) Fluoride

- (c) Lead

- (d) Arsenic

**Answer: (d)** — Over-withdrawal of groundwater in parts of West Bengal and Bihar has increased arsenic concentration, a serious groundwater-quality concern in the Gangetic valley specifically.

**Q4.** Which river is identified as India's most polluted, especially in its stretch between Delhi and Etawah?

- (a) The Ganga

- (b) The Yamuna

- (c) The Sabarmati

- (d) The Gomti

**Answer: (b)** — The Yamuna is identified as the most polluted river in the country, particularly in its stretch between Delhi and Etawah.

**Q5.** Traditional rainwater harvesting structures in Rajasthan, built as covered underground tanks near homes or villages, are locally known as:

- (a) Percolation tanks

- (b) Johad

- (c) Ahar-Pyne

- (d) Kund or Tanka

**Answer: (d)** — Rajasthan's traditional rainwater harvesting structures, covered underground tanks built near homes or villages, are locally known as Kund or Tanka.

**Q6.** The watershed development transformation of Ralegan Siddhi in Maharashtra is widely associated with which social activist?

- (a) Medha Patkar

- (b) Sunderlal Bahuguna

- (c) Rajendra Singh

- (d) Anna Hazare

**Answer: (d)** — Ralegan Siddhi's transformation into a national watershed-development model is widely associated with the social activist Anna Hazare.

**Q7.** India's National Water Policy, 2002, places which use of water as the very first priority in its allocation order?

- (a) Drinking water

- (b) Industrial use

- (c) Irrigation

- (d) Hydro-power generation

**Answer: (a)** — The National Water Policy, 2002, stipulates drinking water as the first priority in its allocation order, ahead of irrigation, hydro-power, navigation and industrial uses.

**Q8.** Under the 1960 Indus Waters Treaty, which three rivers were allocated to India?

- (a) Chenab, Ravi and Indus

- (b) Ganga, Yamuna and Sutlej

- (c) Indus, Jhelum and Chenab

- (d) Ravi, Beas and Sutlej

**Answer: (d)** — The Indus Waters Treaty allocates India the three eastern rivers — Ravi, Beas and Sutlej — while Pakistan receives the three western rivers, the Indus, Jhelum and Chenab.

### Mains Practice Questions

Use these to frame full-length answers. You don't have to answer one exactly — they show the angles UPSC tests, so let them guide which points you cover.

- The groundwater potential of the Gangetic valley is on a serious decline. How may it affect the food security of India?

- The interlinking of rivers can provide viable solutions to the multi-dimensional inter-related problems of droughts, floods and interrupted navigation. Critically examine.

- India is well endowed with fresh water resources. Critically examine why it still suffers from water scarcity.

- Present an account of the Indus Water Treaty and examine its ecological, economic and political implications in the context of changing bilateral relations.

- What is watershed management, and how have programmes like Ralegan Siddhi demonstrated its potential for sustainable development?

### UPSC Mains — Previous Years’ Questions on this topic (last 10 years)

These are the **actual GS Mains questions** UPSC has asked on this theme — real proof of how, and when, it is tested. Try to write a full answer to each.

- 2024: The groundwater potential of the Gangetic valley is on a serious decline. How may it affect the food security of India? (250 words, 15 marks)

- 2020: The interlinking of rivers can provide viable solutions to the multi-dimensional inter-related problems of droughts, floods and interrupted navigation. Critically examine. (150 words, 10 marks)

- 2016: Present an account of the Indus Water Treaty and examine its ecological, economic and political implications in the context of changing bilateral relations. (200 words, 12.5 marks)

- 2015: India is well endowed with fresh water resources. Critically examine why it still suffers from water scarcity. (200 words, 12.5 marks)