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Rajasthan (RBSE)Class 10 Social Studies★ 4–5 marks · RBSE Class 10 Social Science board (Geography — Contemporary India II)

Water Resources

RBSE Class 10 Social Science (Geography) Chapter 3 — why water is becoming scarce despite being a renewable resource, the debate over multi-purpose river projects and large dams (benefits and the criticisms that sparked movements like the Narmada Bachao Andolan), and rainwater harvesting as a people's solution — including Rajasthan's tankas and the bamboo drip system — with RBSE board-pattern questions and model answers.

⏱ 32 min readEasy difficulty✓ Free · NCERT-aligned

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By the end of this chapter you'll be able to…

1Explain why water scarcity occurs even though water is a renewable resource
2List the benefits of multi-purpose river projects and large dams
3Critically evaluate large dams on ecological, social and economic grounds, with the Narmada Bachao Andolan as an example
4Describe traditional and modern rainwater-harvesting methods, including Rajasthan's tankas and the Meghalaya bamboo drip system
5Argue both sides of the dams-versus-decentralised-harvesting debate

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Why this chapter matters

Water scarcity is a lived reality for Rajasthan, making this chapter especially relevant for state students. In the RBSE board it reliably gives a dam-debate question and a rainwater-harvesting question — and the Rajasthan tanka system is the textbook's own headline example.

Before you start — revise these

A 5-minute refresher here will save you 30 minutes of confusion below.

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Drainage (Class 9)

India's rivers and drainage systems that dams are built across.

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Resources and Development (Class 10)

Renewable resources and sustainable development.

Water Resources — RBSE Class 10 (Geography)

Three-quarters of the Earth is covered in water, yet a woman in a Rajasthan village may walk kilometres for a single pot of it. Water is renewable — the hydrological cycle keeps refilling it — and still it is running scarce. This chapter explains that paradox, weighs the giant dams built to solve it, and recovers an old, humble answer hiding in the rooftops and fields of India: harvesting the rain.

1. Water scarcity — why, despite abundance?

About 96.5% of the world's water is in oceans (saline); only a tiny fraction is usable freshwater. Even where water exists, scarcity can arise from:

Over-exploitation and over-use — large and growing population, more farms and industries.
Falling groundwater — energised by tube wells for irrigation; cities and industries draw heavily.
Unequal access — water may be available but not to everyone, or it may be too polluted to use.
Pollution — domestic and industrial waste and farm chemicals make water hazardous.

So scarcity is caused not just by a shortage of water, but by how we use, distribute and pollute it. Ensuring water security for all is the challenge.

2. Multi-purpose river projects and dams

A dam is a barrier across flowing water that holds it in a reservoir. Multi-purpose projects use the stored water for many things at once: irrigation, electricity (hydropower), water supply, flood control, recreation, inland navigation and fish breeding.

Jawaharlal Nehru proudly called dams the "temples of modern India" — they would integrate development of agriculture and industry. Examples: the Bhakra-Nangal, Hirakud and Sardar Sarovar projects.

The criticism — why dams became controversial

Over time, large dams drew strong objections:

Ecological: they fragment rivers, block fish movement, cause excessive sedimentation in the reservoir, and submerge forests and natural vegetation.
Social: they displace large numbers of people — often poor villagers and tribal communities — from their land and livelihoods, frequently without proper rehabilitation.
Economic/equity: benefits (irrigation, power) often flow to large farmers and industries, while the costs fall on the displaced. Irrigation also changed cropping patterns toward water-intensive crops, and excessive use caused salinisation and waterlogging.
They have even induced earthquakes, and inter-state water disputes (e.g. over the Krishna-Godavari, Cauvery) have grown.

These concerns sparked movements such as the Narmada Bachao Andolan against the Sardar Sarovar Dam.

3. Rainwater harvesting — the people's alternative

Because big dams have big costs, attention has returned to rainwater harvesting — a low-cost, community-based, sustainable way to store water where it falls. India has a rich tradition of it:

In the hills of the western Himalayas, guls/kuls (diversion channels) carried river water to fields.
Rooftop rainwater harvesting was common across Rajasthan to store drinking water.
In Bengal's flood plains, people built inundation channels to irrigate fields.
In arid/semi-arid areas, rainwater was stored in tankas within homes for drinking.

Rajasthan's contribution is central here:

In Rajasthan, especially Bikaner, Phalodi and Barmer, underground tankas (kund) built in courtyards or near homes collected and stored rooftop rainwater for drinking through the dry months — often the only source of sweet water in the saline desert.
In Gendathur (Karnataka) and Shillong (Meghalaya), rooftop harvesting still meets a large share of household water needs.
In Meghalaya, an ingenious 200-year-old bamboo drip irrigation system channels stream and spring water to plants.
Tamil Nadu was the first state to make rooftop rainwater harvesting structures compulsory for all houses.

4. Closing thought

The arc of this chapter is a quiet course-correction. India bet big on dams as "temples of modern India" — and they did deliver irrigation and power — but the ecological and human costs turned out to be heavy and unevenly shared, provoking movements like the Narmada Bachao Andolan. The answer the chapter leaves you with is not "no water management" but decentralised, community-driven harvesting — the tankas of Rajasthan and the bamboo drips of Meghalaya — that store water sustainably and put control back in local hands.

For the RBSE board, be ready to argue both sides of the dam debate and to describe traditional rainwater-harvesting methods (with the Rajasthan tanka example) — these are the two long-answer mainstays of this chapter.

Key formulas & results

Everything you need to memorise, in one card. Screenshot this for revision.

Water scarcity causes

Over-use + falling groundwater + unequal access + pollution

Not just physical shortage.

Multi-purpose project

Dam used for irrigation + power + water supply + flood control + navigation + recreation

Nehru: 'temples of modern India'.

Dam criticisms

Ecological harm + displacement + unequal benefits + salinisation

Sparked the Narmada Bachao Andolan.

Rainwater harvesting (traditional)

Guls/kuls · rooftop tankas · inundation channels · bamboo drip

Tanka = Rajasthan; bamboo drip = Meghalaya.

Tamil Nadu first

First state to make rooftop rainwater harvesting compulsory

For all houses, by law.

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Common mistakes & fixes

These are the exact errors that cost students marks in board exams. Read them once, save yourself the trouble.

WATCH OUT

✗ Saying water scarcity is only due to low rainfall

✓ Scarcity is also caused by over-use, falling groundwater, unequal access and pollution. Water may be present but unusable or inaccessible.

WATCH OUT

✗ Presenting dams as wholly good or wholly bad

✓ The chapter wants a BALANCED answer — list real benefits AND the ecological/social/economic criticisms. One-sided answers lose marks.

WATCH OUT

✗ Forgetting to name the Narmada Bachao Andolan

✓ When discussing opposition to large dams, cite the Narmada Bachao Andolan against the Sardar Sarovar Dam — it is the textbook example.

WATCH OUT

✗ Mixing up tanka, gul/kul and bamboo drip

✓ Tanka = underground rooftop-water storage in Rajasthan; gul/kul = Himalayan diversion channels; bamboo drip = Meghalaya stream irrigation. Match method to region.

WATCH OUT

✗ Saying dams only help; ignoring induced problems

✓ Large dams can cause sedimentation, fragment rivers, induce earthquakes, salinise soil and trigger inter-state disputes — mention these for full marks.

NCERT exercises (with solutions)

Every NCERT exercise from this chapter — what it covers and how many questions to expect.

Multiple choice & very short

Causes of scarcity; uses of dams; harvesting methods

Questions

Answer the following

Dam benefits and criticisms; rainwater harvesting traditions

Questions

Project / discussion

Water conservation in your area; the Narmada movement

Questions

Practice problems

Try each one yourself before tapping "Show solution". Active recall > rereading.

Q1EASY· Fact

Who described dams as the 'temples of modern India'?

▶ Show solution

✦ Answer: Jawaharlal Nehru.

Q2EASY· Rajasthan

What is a 'tanka' in the context of rainwater harvesting in Rajasthan?

▶ Show solution

An underground tank/cylindrical pit built in a house or courtyard to collect and store rooftop rainwater for drinking through the dry season.

✦ Answer: an underground rooftop-rainwater storage tank used in Rajasthan.

Q3EASY· Fact

Which state was the first to make rooftop rainwater harvesting compulsory?

▶ Show solution

✦ Answer: Tamil Nadu.

Q4MEDIUM· Scarcity

Give two reasons why water scarcity occurs even in areas with sufficient water.

▶ Show solution

Step 1 — Over-exploitation and over-use by a large population, intensive farming and industry deplete and lower groundwater.

Step 2 — Pollution from domestic, industrial and agricultural waste, plus unequal access, makes available water unusable for many.

✦ Answer: over-use/falling groundwater AND pollution/unequal access (any two).

Q5MEDIUM· Multi-purpose

List any four purposes served by a multi-purpose river project.

▶ Show solution

Any four of: irrigation, hydroelectric power generation, domestic/industrial water supply, flood control, inland navigation, recreation, fish breeding.

✦ Answer: any four valid uses as above.

Q6MEDIUM· Harvesting

Describe the bamboo drip irrigation system.

▶ Show solution

Step 1 — It is a 200-year-old method practised in Meghalaya.

Step 2 — Water from streams and springs is channelled using bamboo pipes to drip at the roots of plants.

Step 3 — It is an efficient, low-cost way to irrigate plantations in hilly terrain.

✦ Answer: a Meghalaya system using bamboo pipes to drip stream/spring water to plant roots.

Q7HARD· Dam debate

Why are large dams increasingly opposed? Give three reasons.

▶ Show solution

Step 1 — Ecological: they fragment rivers, block fish migration, cause heavy sedimentation in the reservoir and submerge forests/vegetation.

Step 2 — Social: they displace large numbers of people (often poor and tribal) from their land and livelihoods, frequently without adequate rehabilitation.

Step 3 — Economic/equity: benefits go mostly to large farmers and industries, while costs fall on the displaced; over-irrigation also causes salinisation and waterlogging.

✦ Answer: ecological damage + displacement + unequal benefits (any three).

Q8HARD· Narmada

What was the Narmada Bachao Andolan and what did it highlight?

▶ Show solution

Step 1 — It was a people's movement against the building of large dams on the Narmada river, especially the Sardar Sarovar Dam.

Step 2 — It highlighted the large-scale displacement of poor and tribal communities and the ecological damage caused by big dams.

Step 3 — It demanded proper rehabilitation of the displaced and a rethink of relying on giant dams.

✦ Answer: an anti-large-dam movement on the Narmada that exposed displacement and ecological costs.

Q9HARD· Evaluate

'Multi-purpose projects are both a boon and a bane.' Discuss with examples.

▶ Show solution

Step 1 — Boon: they provide irrigation, hydroelectricity, drinking and industrial water, flood control, navigation and recreation — Bhakra-Nangal, Hirakud and Sardar Sarovar transformed agriculture and power supply.

Step 2 — Bane (ecological): river fragmentation, sedimentation, blocked fish movement, submergence of forests; can even induce earthquakes.

Step 3 — Bane (social/economic): displacement of poor/tribal people, unequal sharing of benefits, salinisation from over-irrigation, and inter-state water disputes.

Step 4 — Conclusion: dams deliver real benefits but must be balanced with rehabilitation, ecological care, and decentralised harvesting alternatives.

✦ Answer: balanced discussion — benefits (irrigation/power/etc.) vs costs (displacement/ecology/inequity) with examples.

5-minute revision

The whole chapter, distilled. Read this the night before the exam.

•Water is renewable, but scarcity arises from over-use, falling groundwater, unequal access and pollution.
•Multi-purpose projects: irrigation, power, water supply, flood control, navigation, recreation, fish breeding.
•Nehru called dams 'temples of modern India'; examples — Bhakra-Nangal, Hirakud, Sardar Sarovar.
•Dam criticisms: river fragmentation, sedimentation, displacement (poor/tribal), unequal benefits, salinisation, induced quakes.
•Narmada Bachao Andolan opposed the Sardar Sarovar Dam over displacement and ecology.
•Rainwater harvesting: guls/kuls (Himalayas), rooftop tankas (Rajasthan), inundation channels (Bengal), bamboo drip (Meghalaya).
•Rajasthan tankas (Bikaner, Phalodi, Barmer) store rooftop rainwater for drinking in the desert.
•Tamil Nadu was the first state to make rooftop rainwater harvesting compulsory.

Rajasthan (RBSE) marks blueprint

Where the marks come from in this chapter — so you can plan your prep.

Typical chapter weightage: 4–5 marks

Question type	Marks each	Typical count	What it tests
MCQ / very short	1	1–2	Harvesting terms, the 'temples' quote, Tamil Nadu fact
Short answer	2–3	1–2	Causes of scarcity; uses of dams; a harvesting method
Long answer	4	0–1	The dam debate (boon vs bane); rainwater harvesting traditions

Prep strategy

Prepare a two-column 'dams: benefits vs criticisms' answer you can write quickly
Memorise the harvesting methods by region (tanka–Rajasthan, gul/kul–Himalayas, bamboo drip–Meghalaya)
Learn the Narmada Bachao Andolan as the standard anti-dam example
Keep the four causes of water scarcity ready as bullets

Where this shows up in the real world

This chapter isn't just an exam topic — it lives in the world around you.

Rajasthan's tankas and johads

Traditional underground tanks and check-dams still supply drinking water in desert districts.

Mandatory rooftop harvesting

Many Indian states and cities now require rainwater-harvesting structures in new buildings, following Tamil Nadu's lead.

Hydroelectric power

Dams like Bhakra-Nangal supply electricity and irrigation to large parts of northern India.

Watershed development

Decentralised watershed and check-dam projects recharge groundwater in dry regions.

River-linking and disputes

Inter-state water sharing (Cauvery, Krishna) is a live policy issue rooted in this chapter's themes.

Urban water security

Cities facing 'Day Zero'-type crises increasingly turn to rainwater harvesting and reuse.

Exam strategy

Battle-tested tips from teachers and toppers for this chapter.

Treat dam questions as 'discuss' — give both benefits and criticisms with named examples.
Cite the Narmada Bachao Andolan whenever opposition to dams is asked.
Match each harvesting method to its region to avoid mix-ups.
List the four causes of scarcity as distinct points, not one vague sentence.
Use Rajasthan's tanka example for the local-relevance mark.
Conclude balanced answers with a forward-looking line on sustainable, decentralised water use.

Going beyond the textbook

For olympiad aspirants and curious learners — topics that build on this chapter.

The hydrological cycle quantified — how much freshwater is actually accessible.
Groundwater depletion and the concept of the 'water table' and aquifer recharge.
Cost–benefit and environmental-impact analysis of large infrastructure projects.
Inter-state and international river-water sharing law and treaties.

Where else this chapter is tested

CBSE board isn't the only one — other exams test this chapter too.

RBSE Class 10 Board (BSER Ajmer)High — dam debate and rainwater harvesting almost every year

NTSE / state scholarshipMedium — geography MCQs on water resources

UPSC / State PCSMedium — water management and environment

Current affairs / GKMedium — water crises and conservation schemes

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Questions students ask

The real ones — pulled from the Q&A community and tutor sessions.

Yes. RBSE prescribes NCERT 'Contemporary India-II' for Class 10 Geography, so this chapter is identical. RBSE (BSER Ajmer) sets the exam pattern and marking — and Rajasthan's tanka system is the book's own example.

The hydrological cycle does renew water, but we over-use and over-extract it (especially groundwater), pollute it, and distribute it unequally. So usable, clean water in the right place can still fall short of demand.

A dam-based project where the stored water serves several purposes at once — irrigation, hydroelectric power, domestic and industrial supply, flood control, navigation, fish breeding and recreation.

Through the Narmada Bachao Andolan, people opposed it because it displaced large numbers of poor and tribal villagers without proper rehabilitation and caused serious ecological damage by submerging land and forests.

Through tankas (kunds) — underground tanks built inside homes or courtyards that collect rooftop rainwater. In the saline desert districts like Bikaner, Phalodi and Barmer, this stored rainwater is often the only source of clean drinking water.

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