Global Water Resources: WMO Report and India’s Crisis

UPSC Mapping

Prelims

WMO, Hydrological Cycle and Groundwater

Mains

GS Paper III — Water Security and Climate Adaptation

Article

Global Water Resources are showing deeper hydrological instability as rivers, aquifers and glaciers respond to warming, land-use change and intensive human withdrawals. The latest WMO assessment connects falling freshwater storage with recurring droughts, destructive floods, agricultural losses, ecosystem stress and increasingly uneven water availability. For India, the findings sharpen concerns about groundwater-dependent agriculture, Himalayan water systems and climate resilience; aspirants can follow connected developments through the daily current affairs archive.

Report	State of Global Water Resources 2025
Publisher	World Meteorological Organization
Released	17 September 2026
Assessment Year	2025

What are Global Water Resources?

Global Water Resources include freshwater stored or moving through rivers, lakes, reservoirs, aquifers, soil, snow, glaciers, vegetation and wetlands. Their condition reflects the combined influence of precipitation, evaporation, runoff, recharge, land use and human withdrawals. The annual WMO assessment tracks river discharge, groundwater, terrestrial water storage, evapotranspiration, snow, ice and high-impact events through observations, satellite data and hydrological models.

Fast parts of the water cycle, including rainfall, soil moisture and streamflow, can change within days or weeks and transmit weather shocks quickly across connected basins. Groundwater and glaciers respond more slowly and traditionally buffer communities, farms, cities and power systems during dry seasons or failed monsoons. Persistent decline weakens that protection, making rainfall deficits more likely to cause agricultural, drinking-water or energy crises and making systematic monitoring essential for planning, disaster preparedness and climate adaptation.

Why are Global Water Resources in News?

Global Water Resources entered the news after WMO released its 2025 assessment on 17 September 2026, drawing on observations, satellites and an ensemble of hydrological models. The report found that 2025 was among the driest years for worldwide river discharge in 35 years, with below-normal flows across 36% of global basin area. Only 34–38% of basins recorded normal conditions during each of the past seven years, against a 1991–2020 average of 46%; the official WMO water assessment describes an increasingly erratic cycle.

The report identifies a persistent decline in terrestrial water storage since the mid-2010s, showing that slow reserves have not consistently recovered after dry periods. Every major glaciated region recorded net ice loss for a fourth consecutive year, while 2023–2025 produced a cumulative loss of about 1,400 gigatonnes. Northern India showed below-normal land-water storage in 2025 and north-western India experienced persistent groundwater deficits, threatening irrigation reliability, urban supplies, ecosystems and seasonal flows in glacier-influenced rivers.

Key Features

• Abnormal river flows: Normal discharge remained a minority condition for seven consecutive years, showing that many basins increasingly swing between deficits and surpluses rather than staying within historical ranges used for irrigation, navigation, hydropower production and reservoir design.
• Declining land-water storage: Satellite observations show a persistent negative trend since roughly 2014–2016 across water stored in aquifers, soils, rivers, lakes, reservoirs, vegetation, snow and ice, indicating erosion of natural drought buffers needed during consecutive weak rainfall years.
• Groundwater stress: Nearly two-thirds of monitored wells worldwide recorded conditions outside their historical norm during 2025, with deficits observed across north-western India and several other regions facing cumulative multi-year drying without sufficient recovery between seasons.
• Glacier mass loss: Glaciers lost about 408 gigatonnes during the 2025 hydrological year, contributing to sea-level rise while creating short-term flood hazards, unstable glacial lakes and longer-term reductions in dependable meltwater for downstream settlements and economies.
• Unequal disaster burden: Asia and Africa accounted for more than 80% of reported deaths associated with water-related extremes over five years, despite continuing gaps in observations, early-warning coverage, resilient infrastructure and reliable economic-loss assessments.

Challenges

India faces a combined problem of excessive demand, uneven recharge and increasing hydrological volatility.

• Agricultural over-extraction: Water-intensive crops, subsidised electricity and millions of dispersed wells encourage pumping beyond annual recharge in several north-western aquifers, reducing drought resilience, lowering water tables, deepening socioeconomic inequality and increasing farmers’ energy costs.
• Monsoon dependence: A large share of annual recharge arrives during a short rainy season, so delayed rainfall, intense downpours, paved surfaces and longer dry intervals can reduce infiltration despite apparently adequate seasonal totals and worsen local scarcity.
• Himalayan uncertainty: Glacier retreat may temporarily increase meltwater and flood danger before reducing dry-season contributions, complicating reservoir operations, irrigation planning, hydropower generation, ecosystem protection and cooperation across shared river basins.
• Pollution and urban pressure: Sewage, industrial discharge, agricultural chemicals and saline intrusion reduce usable supplies, while expanding cities extract groundwater faster than local institutions can measure, regulate, recharge or replace it safely through alternative sources.
• Fragmented water governance: Surface water, groundwater, land use and urban supply often operate through separate agencies, weakening basin-wide decisions, accountability, community participation and shared data systems; related developments are available in the environment current affairs section.

Way Forward

India should manage Global Water Resources through aquifer-based and basin-based planning rather than isolated supply projects that shift scarcity between places or ignore the ecological flows required by rivers and wetlands. Authorities need public water budgets showing recharge, extraction, quality, competing sectoral demands and seasonal risk at usable local scales, with periodic revision when rainfall or land use changes. Agricultural policy should promote crop diversification, efficient irrigation, soil-moisture conservation and electricity incentives that reward verified savings, while cities protect recharge zones, reuse treated wastewater and control extraction through locally workable metering.

Monitoring networks should integrate wells, river gauges, reservoirs, glacier observations, weather stations and satellite measurements on interoperable platforms with clear quality standards, open metadata and timely public alerts. The CGWB groundwater assessment system can support transparent local decisions when combined with community participation, water-user institutions, pollution control and enforceable withdrawal plans. India should expand flood-and-drought warnings, climate-test infrastructure and strengthen transboundary data cooperation, while demand management and ecosystem restoration complement storage and transfer projects instead of being treated as secondary measures.

Prelims Practice Corner

Q1. The State of Global Water Resources report is published by:

(a) UNEP   (b) WMO   (c) UNESCO only   (d) World Bank

Show answer

Answer: (b) The World Meteorological Organization publishes the annual assessment.

Q2. Terrestrial water storage includes which of the following?

(a) Groundwater only   (b) Rivers only   (c) Water stored on and beneath land   (d) Ocean water only

Show answer

Answer: (c) It includes groundwater, soil moisture, rivers, lakes, reservoirs, vegetation, snow and ice.

Q3. Consider the following statements: 1. Groundwater generally responds more slowly than river flow to weather changes. 2. Glacier loss can create both flood and long-term water-security risks. Which option is correct?

(a) 1 only   (b) 2 only   (c) Both 1 and 2   (d) Neither 1 nor 2

Show answer

Answer: (c) Groundwater changes slowly, while glacier retreat creates immediate hazards and future supply risks.

Q4. Which Indian organisation periodically assesses dynamic groundwater resources with State and Union Territory agencies?

(a) CGWB   (b) FCI   (c) SEBI   (d) TRAI

Show answer

Answer: (a) The Central Ground Water Board conducts the assessment jointly with State and Union Territory agencies.

Q5. North-western India’s groundwater stress is most directly associated with:

(a) Excessive irrigation withdrawals   (b) Volcanic activity   (c) Tidal erosion   (d) Permafrost melting

Show answer

Answer: (a) Intensive irrigation pumping is a major driver of aquifer depletion in the region.

Mains Practice Questions

Q1. India’s groundwater crisis is as much a governance problem as a hydrological problem. Discuss. (15 marks)

Q2. Explain how glacier loss and abnormal river flows can reshape India’s water-security planning. (10 marks)

FAQs on Global Water Resources

What does the WMO water report measure?

It assesses river discharge, groundwater, terrestrial storage, evapotranspiration, snow, glaciers and extreme events. WMO combines observations, models and satellite information for the assessment.

Why is groundwater depletion dangerous?

Groundwater buffers farms and communities when rainfall fails. Persistent depletion raises pumping costs, reduces drought protection and can cause land subsidence or water-quality deterioration.

How can India improve water security?

India needs aquifer-based extraction limits, crop diversification, efficient irrigation, wastewater reuse and protected recharge areas. Better monitoring and early warnings should guide local and basin-level decisions.