🌍 Class 10 Geography – Contemporary India II
Chapter 3: Water Resources
Original Visual Revision Notes Independently created study material. Not affiliated with or endorsed by NCERT.

📌 Contents 1. 📚 Chapter Notes 2. 🎨 Easy Illustrations 3. ✏️ Worked Examples 4. 📋 Cheat Sheet 5. 🏠 Take-Home Handout 6. 🃏 Revision Flashcards 7. 🧠 Mind Map

📝 Section 1 — Chapter Notes

💧 Water as a Renewable Resource

🚫 Causes of Water Scarcity

🏭 Multi-Purpose River Projects

⚠️ Problems with Big Dams

🏟 Rainwater Harvesting — Ancient Traditions

🏠 Modern Rainwater Harvesting

💧 Jal Jeevan Mission and Atal Jal

⛽ Ancient Water Works in India

🎨 Section 2 — Easy Illustrations

Hydrological Cycle — How Water is Renewed SUN CLOUDS Evaporation Rainfall Surface Runoff Groundwater Rivers / Sea Evaporation Soil Layer — absorbs some rainwater as groundwater
The hydrological cycle keeps water renewable
Multi-Purpose River Projects — Uses DAM Hydel Power Irrigation Flood Control Drinking Water Navigation Fish Breeding Examples: Bhakra-Nangal (Punjab), Hirakud (Odisha), Sardar Sarovar (Gujarat)
Multi-purpose dams serve many uses at the same time
Traditional Rainwater Harvesting Methods Tankas Underground tanks Rajasthan homes Guls / Kuls Diversion channels Western Himalayas Khadins Field storage Jaisalmer Johads Village ponds Other Rajasthan areas Modern Methods Rooftop Harvesting Shillong, Tamil Nadu, Karnataka Bamboo Drip Irrigation Meghalaya — 200 years old
Traditional and modern rainwater harvesting methods across India
Big Dams — Advantages vs Disadvantages Advantages Disadvantages Water for irrigation and drinking Hydel power generation Flood control Supports fish breeding and tourism Displaces local communities Poor sediment flow; rocky river beds Soil salinisation from irrigation Inter-state water disputes
Advantages and disadvantages of multi-purpose dam projects

✏️ Section 3 — Worked Examples

📖 Worked Example 1

Question: Even though water is renewable, why do regions still face water scarcity?

1 Water is renewable but unequally distributed — deserts get little rain; cities get floods.
2 Large populations use more water for farms, industries and homes.
3 Groundwater is over-pumped, causing water levels to drop dangerously.
4 Pollution from factories and pesticides makes water unsafe even when it's available.
Answer: Water is renewable but scarcity happens due to overuse, unequal distribution, and pollution. Even areas with enough rainfall can face scarcity if the water is contaminated or if many people compete for the same resource.

📖 Worked Example 2

Question: Explain how the tanka system works in Rajasthan.

1 Houses in Rajasthan have sloping roofs that channel rainwater into pipes.
2 Pipes lead water to underground tanks (tankas) built inside homes or courtyards.
3 The first rain is not collected — it cleans the roof and pipes.
4 Clean rainwater from later showers is stored and used through summer.
Answer: In Rajasthan, sloping roofs collect rainwater that flows through pipes into underground tankas. Water from the first rain is discarded to clean the system. The stored "palar pani" (rainwater) is the purest drinking water available.

📖 Worked Example 3

Question: State two advantages and two disadvantages of the Sardar Sarovar Dam project.

1 Advantage 1: Provides irrigation to 18.45 lakh hectares across three states.
2 Advantage 2: Gives water to drought-prone and desert areas of Gujarat and Rajasthan.
3 Disadvantage 1: Displaced many communities from the Narmada river valley.
4 Disadvantage 2: Led to large-scale submergence of forests and villages.
Answer: Sardar Sarovar benefits millions by irrigating drought-prone land and providing water to desert areas. However, it also displaced thousands of tribal families and submerged villages, forests and biodiversity in the Narmada valley.

📋 Section 4 — Cheat Sheet

TermMeaning
Hydrological CycleThe continuous movement of water through evaporation, clouds and rain
Water ScarcityLack of sufficient usable water due to overuse, pollution or unequal access
Multi-purpose ProjectDam project that serves several uses — irrigation, power, flood control
TankaUnderground tank in Rajasthan homes for storing rooftop rainwater
KhadinsField structures in Jaisalmer that store rainwater for crop moisture
JohadsVillage ponds in Rajasthan used to collect and store rainwater
Guls / KulsDiversion channels in the Western Himalayas for agricultural water
Palar PaniRainwater — considered the purest drinking water in Rajasthan
Bhakra-NangalMajor dam project on Sutlej river; provides power and irrigation in Punjab
Hirakud DamDam on Mahanadi river in Odisha for flood control and irrigation
Sardar SarovarLarge dam on Narmada river in Gujarat; serves four states
SalinisationSalt build-up in soil caused by excess irrigation water evaporating
JJMJal Jeevan Mission — aims for piped water in every rural home
SedimentationBuild-up of sand and silt at the bottom of a dam reservoir

📄 Section 5 — Take-Home Handout

✍️ A. Fill in the Blanks

  1. Underground tanks in Rajasthan homes are called __________.
  2. __________ is the first state to make rooftop rainwater harvesting compulsory.
  3. Water that flows over the land surface after rain is called __________ runoff.
  4. The Bhakra-Nangal project is built on the __________ river.
  5. Jawaharlal Nehru called big dams the "__________ of modern India".

✅ B. True or False

  1. Water is a non-renewable resource because it gets used up. [ ]
  2. Bamboo drip irrigation in Meghalaya is about 200 years old. [ ]
  3. The Sardar Sarovar Dam is built on the Krishna river. [ ]
  4. Gendathur village in Karnataka collects about 1 lakh litres of rain water annually. [ ]
  5. Sedimentation in reservoirs reduces dam life and causes floods downstream. [ ]

🔗 C. Match the Columns

Column A

  1. Bhakra-Nangal
  2. Hirakud
  3. Sardar Sarovar
  4. Bamboo Drip
  5. Guls/Kuls

Column B

  1. Western Himalayas
  2. Meghalaya
  3. Mahanadi, Odisha
  4. Narmada, Gujarat
  5. Sutlej, Punjab

📝 D. Short Answer Questions

  1. What is water scarcity? State any two causes.
  2. How does rooftop rainwater harvesting work?
  3. Name any two multi-purpose river projects and the rivers they are built on.

🌎 E. Think Questions

  1. Why might an area with high rainfall still face water scarcity?
  2. Why is rainwater harvesting a better long-term solution than building big dams?
  3. How has the Indira Gandhi Canal changed water harvesting habits in Rajasthan?

✅ Detailed Answers

A: 1. Tankas   2. Tamil Nadu   3. Surface   4. Sutlej   5. Temples
B: 1. False (water is renewable)   2. True   3. False (built on Narmada)   4. True   5. True
C: 1-e   2-c   3-d   4-b   5-a
D1: Water scarcity is lack of sufficient usable water. Causes: over-population uses more water; pollution makes available water unsafe; over-pumping lowers groundwater levels.
D2: Rain falls on sloping rooftops, flows through pipes, passes through a sand-and-brick filter, and is stored in an underground tank (tanka). The stored water is used in summer when other sources dry up.
D3: Bhakra-Nangal on the Sutlej river (Punjab); Hirakud on the Mahanadi river (Odisha).
E1: High rainfall areas can still face scarcity if water is heavily polluted, if it all runs off quickly without storage, or if a large population overuses the available supply.
E2: Rainwater harvesting is decentralised, low-cost, no displacement, no ecological harm. Big dams need huge investment, displace people and cause ecological problems. Local solutions are more sustainable.
E3: The Indira Gandhi Canal brought reliable water to western Rajasthan. People rely less on tankas now. However, some still maintain tankas because they prefer the taste of palar pani (clean rainwater).

🃏 Section 6 — Revision Flashcards

Why is water called a renewable resource?
Water is continuously renewed through the hydrological cycle — evaporation, clouds and rainfall
What are multi-purpose projects?
Dams that serve multiple uses — irrigation, hydel power, flood control, drinking water, navigation
Name the dam on the Narmada river that serves four states.
Sardar Sarovar Dam — serves Maharashtra, Madhya Pradesh, Gujarat and Rajasthan
What is a tanka?
An underground tank in Rajasthan homes that stores rooftop rainwater for summer use
Which state made rooftop rainwater harvesting compulsory?
Tamil Nadu — with legal provisions to punish those who don't comply
Name two disadvantages of big dams.
Displacement of communities; soil salinisation; poor sediment flow; inter-state disputes
What is Jal Jeevan Mission?
A government scheme to provide 55 litres of piped water per person daily in rural homes
What are guls and kuls?
Diversion channels built in the Western Himalayas to take water from streams to farms

🧠 Section 7 — Mind Map

Water Scarcity Over-use · Pollution Unequal Access Hydrological Cycle Evaporation→Cloud→Rain→Runoff Multi-Purpose Projects Bhakra · Hirakud Sardar Sarovar Dam Problems Displacement Rainwater Harvesting Tanka · Johad · Khadins Guls · Bamboo Drip Government Schemes JJM · Atal Jal · PMKSY Ancient Water Works Sringaverapura · Bhopal Lake Hauz Khas · Chandragupta era Modern Harvesting Tamil Nadu Meghalaya Water Resources Chapter 3
Mind map: Water Resources — all key topics