India’s rivers, dams, and reservoirs form the backbone of the country’s agriculture, hydroelectric power generation, drinking water supply, and flood control systems. Questions related to major rivers, important dams, reservoirs, and river valley projects are frequently asked in AFCAT, CDS, NDA, CAPF, and other defence examinations. A strong understanding of these topics can help candidates score valuable marks in the Static GK section.
AFCAT 2 2026 Exam Static GK – Rivers, Dams & Reservoirs in India
Classification of Rivers in India
Indian rivers are broadly classified into two categories:
1. Himalayan Rivers
These rivers originate from glaciers and receive water throughout the year, making them perennial rivers.
Major Himalayan Rivers:
- Ganga
- Yamuna
- Brahmaputra
- Indus
- Sutlej
- Beas
- Ravi
- Chenab
- Jhelum
2. Peninsular Rivers
These rivers mainly depend on rainfall and are generally seasonal.
Major Peninsular Rivers:
- Godavari
- Krishna
- Kaveri (Cauvery)
- Mahanadi
- Narmada
- Tapi (Tapti)
- Sabarmati
- Periyar
- Pennar
Major Rivers of India: Important Facts
| River | Source | Drainage |
|---|---|---|
| Ganga | Gangotri Glacier | Bay of Bengal |
| Yamuna | Yamunotri Glacier | Joins Ganga at Prayagraj |
| Brahmaputra | Angsi Glacier (Tibet) | Bay of Bengal |
| Indus | Tibetan Plateau | Arabian Sea |
| Godavari | Trimbakeshwar, Maharashtra | Bay of Bengal |
| Krishna | Mahabaleshwar, Maharashtra | Bay of Bengal |
| Narmada | Amarkantak Plateau | Arabian Sea |
| Tapi | Satpura Hills | Arabian Sea |
| Mahanadi | Chhattisgarh Highlands | Bay of Bengal |
| Kaveri | Talakaveri, Karnataka | Bay of Bengal |
Important Dams in India
Dams play a vital role in irrigation, flood control, drinking water supply, and hydroelectric power generation. Several major dams are regularly asked in defence examinations.
| Dam | River | State |
| Bhakra Nangal Dam | Sutlej | Himachal Pradesh/Punjab |
| Tehri Dam | Bhagirathi | Uttarakhand |
| Hirakud Dam | Mahanadi | Odisha |
| Sardar Sarovar Dam | Narmada | Gujarat |
| Nagarjuna Sagar Dam | Krishna | Telangana/Andhra Pradesh |
| Srisailam Dam | Krishna | Andhra Pradesh/Telangana |
| Indira Sagar Dam | Narmada | Madhya Pradesh |
| Idukki Dam | Periyar | Kerala |
| Tungabhadra Dam | Tungabhadra | Karnataka |
| Mettur Dam | Kaveri | Tamil Nadu |
| Rihand Dam | Rihand | Uttar Pradesh |
| Bhavanisagar Dam | Bhavani | Tamil Nadu |
Major Reservoirs in India
Reservoirs are artificial lakes formed behind dams for storing water and generating hydroelectric power.
| Reservoir | River | State | Associated Dam |
| Gobind Sagar | Sutlej | Himachal Pradesh | Bhakra Dam |
| Tehri Lake | Bhagirathi | Uttarakhand | Tehri Dam |
| Hirakud Reservoir | Mahanadi | Odisha | Hirakud Dam |
| Nagarjuna Sagar Reservoir | Krishna | Telangana | Nagarjuna Sagar Dam |
| Indira Sagar Reservoir | Narmada | Madhya Pradesh | Indira Sagar Dam |
| Sardar Sarovar Reservoir | Narmada | Gujarat | Sardar Sarovar Dam |
| Govind Ballabh Pant Sagar | Rihand | Uttar Pradesh | Rihand Dam |
| Idukki Reservoir | Periyar | Kerala | Idukki Dam |
Important River Valley Projects
Damodar Valley Project
- India’s first multipurpose river valley project.
- Established in 1948.
- Covers Jharkhand and West Bengal.
Bhakra Nangal Project
- Built on the Sutlej River.
- Major source of irrigation and electricity for northern India.
Tungabhadra Project
- Joint venture of Karnataka and Andhra Pradesh.
- Important for irrigation and power generation.
Sardar Sarovar Project
- Constructed on the Narmada River.
- Provides irrigation, drinking water, and hydroelectric power to several states.
AFCAT 2 2026 Exam Important Facts
- Longest River in India – Ganga
- Largest River Basin – Ganga Basin
- Highest Dam in India – Tehri Dam (260.5 m)
- Longest Dam in India – Hirakud Dam
- Largest Reservoir by Capacity – Indira Sagar Reservoir
- Oldest Dam in India – Kallanai Dam (Tamil Nadu)
- World’s Largest Masonry Dam – Nagarjuna Sagar Dam
- Largest Arch Dam in India – Idukki Dam
- River Known as “Sorrow of Bihar” – Kosi
- River Known as “Sorrow of Bengal” – Damodar
- River Known as “Dakshin Ganga” – Godavari
- Largest Delta in the World – Ganga-Brahmaputra Delta
- Largest Gravity Dam in India – Bhakra Dam
AFCAT Exam Tips
- Memorize the River–Dam–State combination.
- Revise the largest, longest, oldest, and highest records.
- Focus on reservoirs associated with major dams.
- Learn river origins and drainage systems.
- Practice map-based questions for important rivers and dams.
Quick Revision Table
| Feature | Answer |
| Longest River | Ganga |
| Highest Dam | Tehri Dam |
| Longest Dam | Hirakud Dam |
| Largest Reservoir | Indira Sagar Reservoir |
| Largest River Basin | Ganga Basin |
| Sorrow of Bihar | Kosi |
| Dakshin Ganga | Godavari |
| Oldest Dam | Kallanai Dam |
