Composite Water Management Index

Geography glossary

Also called: CWMI · Topic: Water Resources of India: Availability, Use and Conservation · NCERT: Beyond NCERT

Meaning

The Composite Water Management Index (CWMI) is a NITI Aayog index, first released in 2018, that scores and ranks Indian States on how well they manage water. It covers groundwater, water bodies, irrigation, farm water use, rural and urban drinking water, and water policy.

It matters because water is a State subject. The Centre cannot run water management directly. A public ranking pushes States to improve by comparing them with each other, and it shows where water is being managed badly, not just where water is short.

Explanation

Why the index was needed

  • India's water problem is mainly about management, not just rainfall.
  • India has about 4% of the world's water but more than 17% of its people.
  • Class 10 says scarcity comes mostly from over-exploitation, excessive use and unequal access, not from low rainfall alone.

  • Shillong and Chennai are short of water even though they get heavy rain.

  • Water is handled by the States.

  • Water is a State subject (Entry 17, List II). Inter-State rivers come under Entry 56, List I.

  • So every State has its own rules, data and results. Before the index, there was no single scorecard to compare them.

  • Data was scattered. Groundwater figures came from CGWB, irrigation figures from irrigation departments, and drinking-water figures from other ministries. The CWMI brings them together into one score.

How it works (input → score → result)

  • Input: States report data on a set of water indicators. Each indicator is a measurable item, such as how much of the irrigation potential is actually used.
  • Process: NITI Aayog checks the data, gives a score for each indicator, and adds the scores up into one composite (combined) score out of 100.
  • Result: States are ranked. They are also compared with their own earlier score, so a State can show improvement even if its rank stays the same.
  • Two groups of States: Himalayan and North-Eastern States are ranked separately from the other States, because their terrain, rainfall and water sources are very different.

What it measures (the main themes)

  • Supply side (adding to the water available):
  • restoring water bodies such as ponds, tanks and lakes;
  • groundwater recharge and source augmentation (for example, the share of over-exploited units under control);
  • major and medium irrigation projects;

  • watershed development (catching rain where it falls through check dams and percolation tanks).

  • Demand side (using water carefully):

  • participatory irrigation, where farmers' groups help manage canals;

  • sustainable on-farm water use, such as micro-irrigation (drip and sprinkler).

  • Drinking water and sanitation: rural drinking water supply, and urban water supply and sanitation.

  • Policy and governance: whether a State has groundwater laws, water pricing, data systems and a State water policy.

The ideas behind it

  • Competitive federalism means States compete with each other to perform better on a public ranking.
  • Cooperative federalism means the Centre and the States work together. NITI Aayog helps States learn from the best performers.
  • The index measures management, not endowment (how much water nature gives). A dry State can score well if it manages its water carefully. A wet State can score badly if it does not.

Where it occurs

  • Who runs it: NITI Aayog, working with the central water ministry (now the Ministry of Jal Shakti, formed in May 2019).
  • Coverage: all States, ranked in two groups: (1) Himalayan and North-Eastern States, and (2) other States.
  • Links to schemes and data in the note:
  • groundwater indicators use CGWB's Dynamic Ground Water Resource Assessment and its stage-of-extraction classes (safe up to 70%, semi-critical 70-90%, critical 90-100%, over-exploited above 100%);
  • irrigation and on-farm themes match PMKSY (Har Khet Ko Pani, Per Drop More Crop);
  • rural drinking water matches the Jal Jeevan Mission (55 litres per person per day);

  • watershed themes match Haryali and Jal Shakti Abhiyan: Catch the Rain.

  • Stressed States the index helps flag:

  • Punjab (stage of extraction about 156% in 2024; about three-quarters of its blocks over-exploited);
  • Haryana, Rajasthan and Delhi (where over-exploited units cluster);

  • Tamil Nadu (374 over-exploited, 48 critical and 235 semi-critical blocks in an older CGWB profile).

  • Use in current debates: NITI Aayog's Investment Friendliness Index (July 2026) only scores whether investors can get water. It does not check whether that supply can last, which is the kind of question CWMI-type indicators measure.

Don't confuse with

  • Investment Friendliness Index (IFI): also from NITI Aayog, but it ranks States on how ready they are for investment (Gujarat, Maharashtra, Tamil Nadu in the top three). It treats water as a service for industry. CWMI ranks how well water itself is managed.
  • Dynamic Ground Water Resource Assessment: done by CGWB and the States for every block. It classifies groundwater units (safe to over-exploited). It is a data source, not a ranking of States on overall water management.
  • Falkenmark indicator: measures water availability per person (below 1,700 cubic metres = stress, below 1,000 = scarcity, below 500 = absolute scarcity). It measures what nature provides. CWMI measures how well that water is managed.
  • Atal Bhujal Yojana: a scheme that spends money on groundwater management in 7 States. CWMI is an index that measures performance. It does not fund projects.

Prelims Hooks

  • CWMI is released by NITI Aayog, not by CGWB or CWC. It was first released in 2018.
  • It ranks States in two groups: Himalayan and North-Eastern States, and other States.
  • Its themes cover both the supply side (water bodies, groundwater recharge, irrigation, watershed) and the demand side (participatory irrigation, on-farm water use), plus drinking water and policy and governance.
  • It is an example of competitive and cooperative federalism, because water is a State subject (Entry 17, List II).
  • Trap: "CWMI measures how much water a State has." FALSE. It measures management. Availability per person is measured by tools like the Falkenmark indicator.
  • Trap: "The Investment Friendliness Index and CWMI are published by different bodies." FALSE. Both are NITI Aayog products.

Mains Points

  • It backs up the "management, not availability" argument.
  • The index shows that results depend on governance: groundwater laws, water pricing, irrigation efficiency and data.

  • So a State's water crisis cannot be blamed on rainfall alone. Punjab's over-exploitation, caused by free farm power and paddy, is a management failure.

  • Limits of ranking water through indices.

  • Data is reported by the States themselves, so its quality varies.
  • A State average can hide stressed districts. In Tamil Nadu, State-level groundwater development of about 77% hides over-exploited interior blocks.

  • Some States do not take part in every edition, which weakens comparison.

  • Policy use (GS-III).

  • CWMI-type indicators could be added to other rankings, such as the IFI, so that a State cannot climb an investment ranking by drawing down its aquifers.
  • Its scores can also help target central schemes (PMKSY, Atal Bhujal, Jal Jeevan Mission) at the weakest States and themes.

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