GS Paper 1 15 marks · 250w 14 min Medium
What is water stress? How and why does it differ regionally in India?
Subtopic: Geography · water resources and water stress
How to structure your answer
Introduction (define water stress via Falkenmark threshold; India's per-capita position) → regional pattern: north-west groundwater overdraft → peninsular rain-shadow and hard-rock aquifers → arid west; water-rich but economically scarce east → urban and Himalayan stress → why: monsoon concentration, cropping choices, open-access groundwater, pollution → Conclusion: demand-side management
Written within the word limit
264 words · target 250 words · 14 min
Water stress arises when renewable freshwater availability falls below 1,700 cubic metres per person per year (Falkenmark index); below 1,000 it becomes scarcity. With about 18% of the world's population but only 4% of its freshwater, India's per-capita availability of roughly 1,486 cubic metres (2021) makes it water-stressed; NITI Aayog's Composite Water Management Index (2018) estimated nearly 600 million Indians face high to extreme stress.
How stress differs regionally
- North-west (Punjab, Haryana, western UP, Rajasthan): acute groundwater depletion driven by paddy-wheat monoculture, assured MSP procurement and free power — a majority of Punjab's assessment blocks are over-exploited (CGWB).
- Peninsular interior (Marathwada, Vidarbha, Rayalaseema, north Karnataka): rain-shadow location plus hard-rock aquifers with poor recharge; water-hungry sugarcane deepens recurrent drought.
- Western arid zone (west Rajasthan, Kachchh): physical scarcity with rainfall below 300 mm.
- Eastern India (Bihar, eastern UP, Assam): water-abundant yet "economically" scarce — floods, weak irrigation and storage infrastructure limit usable supply.
- Cities: Chennai's 2019 "Day Zero" and Bengaluru's 2024 crisis reflect concentrated demand, encroached lakes and heavy distribution losses.
- Himalaya: nearly half the region's springs are drying (NITI Aayog), stressing hill towns.
- Coastal belts (Saurashtra, Chennai's aquifers): over-extraction invites seawater ingress, turning quantity stress into quality-driven scarcity.
Why the differences arise
- Monsoon dependence — about 80% of rainfall in four months — with sharp basin-to-basin variability between the Brahmaputra's plenty and peninsular deficits.
- Cropping patterns misaligned with agro-climate, groundwater treated as an open-access resource, pollution shrinking usable water, and rising urban-industrial demand.
Managing stress demands demand-side reform: community groundwater management on the Atal Bhujal Yojana model, micro-irrigation under Per Drop More Crop, crop diversification away from paddy and sugarcane in stressed zones, and treating water as a shared, priced and protected resource.
What an examiner expects to see
- Define precisely: Falkenmark thresholds — stress below 1,700 cubic metres per capita per year, scarcity below 1,000; India around 1,486 (2021).
- Headline data: 18% of world population, 4% of freshwater; ~600 million under high-extreme stress (CWMI 2018).
- North-west India: policy-induced groundwater overdraft — paddy-wheat, MSP procurement, free power; CGWB over-exploited blocks.
- Peninsular interior: physical (rain-shadow) plus geological (hard-rock, low recharge) causes; sugarcane aggravates.
- Eastern India illustrates economic water scarcity — abundance without infrastructure; distinguish physical vs economic scarcity for marks.
- Urban and Himalayan dimensions: Chennai 2019, Bengaluru 2024, drying springs.
- Causes of regional variation: monsoon concentration (~80% in four months), basin disparities, cropping choices, open-access groundwater, pollution.
- Forward look: Atal Bhujal, micro-irrigation (per drop more crop), crop diversification, supply-demand convergence.
Concrete cases, schemes and judgments
- NITI Aayog Composite Water Management Index (2018): ~600 million Indians in high to extreme water stress.
- Chennai 'Day Zero' (June 2019) when all four reservoirs ran dry; Bengaluru water crisis (2024).
- CGWB assessments showing most Punjab blocks over-exploited due to paddy cultivation.
- Atal Bhujal Yojana — community-led groundwater management in seven states.
- NITI Aayog Himalayan springs report: nearly 50% of springs drying.
Terminology to weave into the answer
Falkenmark indexphysical vs economic scarcitygroundwater over-exploitationmonsoon variabilityhard-rock aquifersdemand-side management