Water Resources
Why a water-rich country still runs short — and how we manage it
Summary
Although water is a renewable resource, large parts of India face water scarcity due to over-exploitation, a growing population, uneven rainfall and the pollution of rivers and lakes. The chapter explains how scarcity can exist even where water seems plentiful, because it is really a problem of quality and distribution.
It examines multi-purpose river projects and dams — their many benefits such as irrigation, hydro-electricity, flood control and domestic water supply — alongside their heavy costs: displacement of people, sedimentation, ecological damage and conflicts between regions and users.
Finally it presents rainwater harvesting and traditional water-management systems as sustainable, community-based alternatives, with concrete regional examples ranging from rooftop tankas in Rajasthan to bamboo drip irrigation in Meghalaya.
Key points to remember
- Water scarcity can be caused by over-use and bad management, not just low rainfall.
- Multi-purpose projects serve irrigation, hydro-power, flood control and water supply.
- Dams have social and environmental costs: displacement, sedimentation, ecological harm.
- The Narmada Bachao Andolan opposed large dams on the Narmada river.
- Bhakra-Nangal and Hirakud are well-known multi-purpose projects in India.
- Rainwater harvesting is an ancient, sustainable practice revived in many regions.
- Examples: rooftop tankas in Rajasthan, bamboo drip irrigation in Meghalaya.
- Jawaharlal Nehru called dams the 'temples of modern India'.
Important questions (board pattern)
- 3 marksWhy does water scarcity occur even in areas with sufficient water?
How to answer: Explain over-exploitation, pollution and unequal access — scarcity is about quality and distribution, not just quantity.
- 5 marksEvaluate the advantages and disadvantages of multi-purpose river projects.
How to answer: Give three benefits and three problems, then a balanced concluding line.
- 5 marksHow is rainwater harvesting practised in different parts of India?
How to answer: Give regional examples: tankas in Rajasthan, rooftop systems, bamboo drip irrigation in Meghalaya.
- 1 markWhat is a multi-purpose river project?
How to answer: A project where a single dam serves several purposes at once, such as irrigation and electricity generation.
- 3 marksWhy did the Narmada Bachao Andolan oppose large dams?
How to answer: Highlight displacement of locals, loss of livelihoods and forests, and inadequate rehabilitation.
Common exam traps
- Scarcity isn't only about low rainfall — always mention over-use and pollution.
- Don't list only the benefits of dams — board questions expect the social/ecological costs too.
- Keep regional examples accurate and matched to the right state.
- Bamboo drip irrigation is from Meghalaya, not Rajasthan — don't swap examples.
Frequently asked questions
- What are the main causes of water scarcity in India?
- Over-exploitation, a growing population and farming demand, uneven rainfall, and pollution that makes available water unusable.
- What is the Narmada Bachao Andolan?
- A people's movement opposing large dams on the Narmada river, highlighting the displacement of local people and damage to the environment.
- Why is rainwater harvesting important?
- It conserves water locally, recharges groundwater, and offers a sustainable, community-managed alternative to large dams.