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Dams & Rivers

IBPS PO · General Awareness

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Core Concept

Read this first — the foundation of the topic

→Core Concept

A dam is a barrier built across rivers to store water, control floods, or generate electricity. India has numerous multipurpose dams built on major rivers for irrigation, power generation, and water supply

💡Key Classification of Dams

By Height: Large dams (above 15m), Major dams (above 150m) 2. By Purpose: Irrigation, Hydroelectric, Multipurpose 3. By Construction: Concrete, Earth-fill, Rock-fill Major River Systems and Their Dams: Ganga System: Tehri Dam (Bhagirathi), Farakka Barrage (Ganga) Godavari System: Pochampad Dam, Sriramsagar Dam Krishna System: Nagarjuna Sagar, Srisailam Dam Narmada System: Sardar Sarovar Dam, Omkareshwar Dam Cauvery System: Mettur Dam, Krishnaraja Sagar

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Exam Patterns

What examiners ask — read before attempting PYQs

SSC CGL typically asks 2-3 questions on dams and rivers. Common question types include: - Which river does XYZ dam built on? - Tallest/Largest dam in India - State-wise dam locations - Multipurpose river projects Memory Trick - 'BIG DAMS': B - Bhakra (Sutlej) - Himachal Pradesh I - Idukki (Periyar) - Kerala G - Gandhi Sagar (Chambal) - Madhya Pradesh D - Damodar Valley Corporation - Jharkhand A - Almatti (Krishna) - Karnataka M - Mettur (Cauvery) - Tamil Nadu S - Sardar Sarovar (Narmada) - Gujarat

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Worked Example

Solve this step-by-step before moving on

1

Step 1

Recall the dam name - Bhakra Nangal

2

Step 2

Apply RIVER-STATE connection

3

Step 3

Bhakra Nangal = Sutlej River = Himachal Pradesh

4

Step 4

Additional fact - It's India's second tallest dam (226m) Answer: Sutlej River, Himachal Pradesh State-wise Distribution Shortcut: South India: Karnataka (Krishna river dams), Tamil Nadu (Cauvery dams) West India: Gujarat (Narmada dams), Maharashtra (Godavari dams) North India: Himachal Pradesh (Sutlej system), Uttarakhand (Ganga system) East India: West Bengal (Damodar system), Odisha (Mahanadi system) Common Mistakes: 1. Confusing Tehri Dam location - It's in Uttarakhand, not Himachal Pradesh 2. Mixing up Hirakud (Mahanadi-Odisha) with Sardar Sarovar (Narmada-Gujarat) 3. Remember: Tallest dam is Tehri (260m), not Bhakra Nangal Multipurpose Projects: These serve irrigation, power generation, flood control, and navigation. Examples include Damodar Valley Corporation, Bhakra Nangal, and Hirakud. Focus on dam-river-state trinity for maximum exam scoring. Create mental maps linking rivers to their major dams and respective states.

🔑 Key Points

Tehri Dam on Bhagirathi River is India's tallest dam at 260 meters height
Hirakud Dam on Mahanadi River in Odisha is India's longest dam
Sardar Sarovar Dam on Narmada River is Gujarat's largest multipurpose project
Bhakra Nangal Dam on Sutlej River serves Punjab, Haryana, and Rajasthan
Mettur Dam on Cauvery River is Tamil Nadu's largest reservoir
Nagarjuna Sagar on Krishna River spans Telangana and Andhra Pradesh border
Damodar Valley Corporation covers multiple dams in Jharkhand and West Bengal
Gandhi Sagar Dam on Chambal River is located in Madhya Pradesh

📌 Exam Facts

Tehri Dam height: 260 meters, located in Uttarakhand on Bhagirathi River
Hirakud Dam length: 25.8 km, built on Mahanadi River in Odisha
Sardar Sarovar Dam height: 163 meters, Narmada River, Gujarat
Bhakra Nangal Dam height: 226 meters, Sutlej River, Himachal Pradesh
Mettur Dam built in 1934 on Cauvery River in Tamil Nadu
Nagarjuna Sagar Dam world's largest masonry dam on Krishna River
Idukki Dam arch dam on Periyar River in Kerala with 168m height
Almatti Dam on Krishna River in Karnataka completed in 2005

🚀 60-Second Revision

Remember: Tehri (260m) tallest, Hirakud longest, Sardar Sarovar on Narmada
Trick: BHAKRA = Sutlej + Himachal Pradesh, serves 3 states
South focus: Mettur-Cauvery-TN, Nagarjuna Sagar-Krishna-border
Formula: Dam name + River + State = 90% dam questions covered
Trap: Don't confuse Tehri (Uttarakhand) with other Himalayan dams
Key multipurpose: DVC, Bhakra Nangal, Hirakud serve multiple purposes
State pattern: Gujarat-Narmada, Odisha-Mahanadi, Karnataka-Krishna connections

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