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Major Dams of India for UPSC Prelims 2026: Complete Notes with Rivers, Maps & Important Facts

 

Major Dams of India – UPSC Prelims Notes

1. Importance of Dams in India



Concept of Dams

  • A dam is a barrier constructed across a river or stream to store and regulate water flow.

  • Water stored behind the dam forms a reservoir, which is used for multiple economic purposes.

Multipurpose River Valley Projects

Dams are called Multipurpose Projects because they serve several functions simultaneously:

  • Irrigation: Water storage for agricultural fields during dry seasons.

  • Hydropower generation: Electricity produced through turbines driven by flowing water.

  • Flood control: Regulating excess water during heavy rainfall.

  • Drinking water supply: Urban and rural domestic water use.

  • Industrial water supply

  • Navigation and fisheries development

Role in India’s Development

  • After independence, dams became symbols of economic development and modernization.

  • Jawaharlal Nehru famously called dams “Temples of Modern India.”

  • Dams played a major role in:

    • Green Revolution

    • Expansion of irrigation

    • Industrial development

    • Energy security

Challenges and Criticism

Large dams also create social and environmental concerns:

  • Displacement of local populations

  • Forest submergence

  • Loss of biodiversity

  • Changes in river ecology

These issues led to movements like Narmada Bachao Andolan.

2. Dam Statistics in India



Key Statistics

According to the Central Water Commission (CWC):

  • India has over 5,264 large dams.

  • Around 437 dams are under construction.

  • India ranks 3rd globally in dam construction after China and the United States.

States with Maximum Dams

  1. Maharashtra

  2. Madhya Pradesh

  3. Gujarat

  4. Karnataka

  5. Rajasthan

Importance for UPSC

Questions often focus on:

  • Largest dam

  • Highest dam

  • Longest dam

  • River–dam combinations

3. Major Dams of Northern India

Bhakra Nangal Dam (Himachal Pradesh–Punjab)


Key Facts

  • River: Sutlej

  • Type: Concrete gravity dam

  • Height: ~226 m

  • Reservoir: Gobind Sagar Lake

Importance

  • One of the highest gravity dams in the world.

  • Provides irrigation to:

    • Punjab

    • Haryana

    • Rajasthan

  • Generates around 1325 MW hydropower.

  • Major contributor to Green Revolution irrigation system.

Tehri Dam (Uttarakhand)

4

Key Facts

  • River: Bhagirathi

  • Height: 260.5 m

  • Location: Tehri Garhwal district

  • Type: Earth and rock-fill dam

Importance

  • Highest dam in India

  • Provides drinking water to:

    • Delhi

    • Uttar Pradesh

    • Uttarakhand

  • Installed capacity: 1000 MW

  • Additional pumped storage project planned.

Environmental Debate

The project faced opposition led by environmental activist Sunderlal Bahuguna due to ecological concerns.

4. Major Dams of Western India

Sardar Sarovar Dam (Gujarat)

4

Key Facts

  • River: Narmada

  • Height: ~139 m

  • One of India’s largest multipurpose river valley projects.

Benefits

  • Irrigation in Gujarat and Rajasthan

  • Drinking water supply to hundreds of villages

  • Hydropower generation (~1450 MW)

Major Controversy

  • Narmada Bachao Andolan protested displacement and environmental issues.

Ukai Dam (Gujarat)


Key Facts

  • River: Tapti

  • Reservoir: Vallabh Sagar

  • One of the largest reservoirs in Gujarat.

Purpose

  • Flood control

  • Hydropower generation

  • Irrigation supply

5. Major Dams of Central India

Indira Sagar Dam (Madhya Pradesh)

4

Key Facts

  • River: Narmada

  • Installed capacity: 1000 MW

  • One of India’s largest hydropower projects.

Importance

  • Provides irrigation water to large areas of Madhya Pradesh.

  • Part of the Narmada Valley Development Project.

Rihand Dam (Uttar Pradesh)

4

Key Facts

  • River: Rihand (tributary of Son River)

  • Reservoir: Govind Ballabh Pant Sagar

  • India’s largest artificial lake.

Purpose

  • Irrigation

  • Hydropower

  • Industrial water supply

6. Major Dams of Eastern India

Hirakud Dam (Odisha)

4

Key Facts

  • River: Mahanadi

  • Length: 25.8 km

  • Completed in 1957

Importance

  • Longest dam in the world

  • Built mainly to control floods in the Mahanadi delta.

  • Provides irrigation to large parts of Odisha.

7. Major Dams of Southern India

Krishna Raja Sagar Dam (Karnataka)

4

Key Facts

  • River: Kaveri

  • Built by Mysore Kingdom under Maharaja Krishnaraja Wadiyar IV.

  • Construction began: 1911

Importance

  • Provides water to:

    • Mysuru

    • Mandya

    • Bengaluru

  • Supports Brindavan Gardens tourism.

Idukki Dam (Kerala)

4

Key Facts

  • River: Periyar

  • Type: Arch dam

  • Located between Kuravan and Kurathi hills.

Importance

  • One of India’s highest arch dams.

  • Major source of electricity for Kerala.

8. Major Dams in North-East India

Subansiri Lower Dam

4

Key Facts

  • River: Subansiri

  • Located between Assam and Arunachal Pradesh

  • Under construction.

Importance

  • Expected to be one of India’s largest hydropower projects.

  • Part of the strategy to make North-East India the future hydropower hub.

9. High-Yield Revision Facts for UPSC

Highest Dam in India

  • Tehri Dam – Uttarakhand

Longest Dam in the World

  • Hirakud Dam – Odisha

Largest Artificial Lake in India

  • Govind Ballabh Pant Sagar – Rihand Dam

Largest Hydropower Project (planned)

  • Dibang Dam – Arunachal Pradesh

Largest Hydropower Station in India

  • Koyna Hydroelectric Project – Maharashtra

10. Expected UPSC Prelims Questions

  1. Which dam is built across the Sutlej River?
    → Bhakra Nangal Dam

  2. The Hirakud Dam is located on which river?
    → Mahanadi

  3. Tehri Dam is built on which river?
    → Bhagirathi

  4. Sardar Sarovar Project is located on which river?
    → Narmada

UPSC Preparation Tip

Always revise Dam – River – State combinations and remember superlatives such as:

  • Highest

  • Longest

  • Largest reservoir

  • Largest hydropower plant

These are very frequently asked in UPSC Prelims.

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