Overview — India’s River Systems & Water Resources
India has an extensive river network spanning approximately 4,00,000 km, fed by rain, glaciers, and snowmelt. The country receives an average annual rainfall of ~1,170 mm and has an estimated total water resource of ~1,999 billion cubic metres (BCM), of which only ~1,123 BCM is utilisable (690 BCM surface + 433 BCM groundwater).
India’s rivers are broadly classified into two groups based on their origin:
| Category | Origin | Flow Character | Examples |
|---|---|---|---|
| Himalayan Rivers | Glaciers in the Himalayas / Tibet | Perennial (snow-fed + rain-fed); long courses; large basins; form meanders and oxbow lakes in plains | Ganga, Brahmaputra, Indus |
| Peninsular Rivers | Western Ghats, Central Highlands | Seasonal (rain-fed); shorter courses; shallower and narrower; mostly non-navigable; flow through hard rock with well-defined valleys | Godavari, Krishna, Narmada, Kaveri |
Constitutional provisions: Water is a State subject (Entry 17, State List). However, Parliament can legislate on inter-state river disputes under Entry 56, Union List, read with Article 262.
Key legislation: Inter-State River Water Disputes Act, 1956 (amended 2002); River Boards Act, 1956
Himalayan Rivers
A. Ganga River System
The Ganga basin is the largest river basin in India, covering ~8,61,452 km² (26.3% of India’s area) across 11 states. It supports ~43% of India’s population.
| River | Origin | Total Length | States Flowed Through | Major Tributaries | Drains Into | Key Facts |
|---|---|---|---|---|---|---|
| Ganga | Gangotri Glacier (Gaumukh), Uttarakhand, at 3,892 m; named Bhagirathi at source; becomes Ganga after confluence with Alaknanda at Devprayag | 2,525 km | Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, West Bengal | Left bank: Ramganga, Gomti, Ghaghara, Gandak, Kosi; Right bank: Yamuna, Son, Damodar | Bay of Bengal (as Hooghly in India; as Padma/Meghna in Bangladesh) | National River of India (declared 2008); Gangetic dolphin is National Aquatic Animal; forms world’s largest delta (Sundarbans) with Brahmaputra |
| Yamuna | Yamunotri Glacier, Banderpoonch Peak, Uttarakhand, at 6,387 m elevation | 1,376 km | Uttarakhand, Himachal Pradesh, Haryana, Delhi, Uttar Pradesh | Left bank: Tons, Hindon; Right bank: Chambal, Sindh, Betwa, Ken | Joins Ganga at Prayagraj (Triveni Sangam) | Longest tributary of Ganga; Delhi’s primary water source; one of most polluted rivers in India |
| Chambal | Janapav Hills, near Mhow, Madhya Pradesh (Vindhya Range) | 960 km | Madhya Pradesh, Rajasthan, Uttar Pradesh | Banas, Kali Sindh, Sipra, Parvati | Joins Yamuna near Etawah, UP | Known for ravines (badlands); National Chambal Sanctuary (Gharial habitat); right-bank tributary of Yamuna |
| Betwa | Bhopal district, Madhya Pradesh (Vindhya Range) | 590 km | Madhya Pradesh, Uttar Pradesh | Dhasan, Bina | Joins Yamuna near Hamirpur, UP | Part of Ken-Betwa Link Project (India’s first river interlinking project) |
| Ken | Ahirgawan village, Jabalpur district, Madhya Pradesh | 427 km | Madhya Pradesh, Uttar Pradesh | Bewas, Sonar, Urmil | Joins Yamuna near Chilla, Fatehpur, UP | Flows through Panna Tiger Reserve; part of Ken-Betwa Link |
| Son (Sone) | Near Amarkantak Hill, Chhattisgarh (same plateau as Narmada, but flows east) | 784 km | Chhattisgarh, Madhya Pradesh, Uttar Pradesh, Jharkhand, Bihar | Rihand, Kanhar, North Koel, Johilla | Joins Ganga near Patna, Bihar | Second-largest right-bank (southern) tributary of Ganga after Yamuna; Rihand Dam is on its tributary |
| Ghaghara (Karnali) | Mapchachungo Glacier, Tibet, at ~3,962 m | 1,080 km | Enters India in UP via Nepal; flows through UP, Bihar | Sharda (Mahakali), Rapti, Little Gandak | Joins Ganga at Revelganj, Bihar | Largest tributary of Ganga by volume; second-longest after Yamuna |
| Gandak (Narayani) | Nhubine Himal Glacier, Nepal Himalayas | 630 km (approx.) | Nepal, Bihar, Uttar Pradesh | Trisuli, Budhi Gandak | Joins Ganga near Hajipur/Patna, Bihar | Left-bank tributary; brings nutrient-rich alluvium to Bihar |
| Kosi | Confluence of Sun Kosi, Arun, and Tamur rivers in Nepal (headwaters in Tibet) | 720 km | Tibet (China), Nepal, Bihar | Sun Kosi, Arun, Tamur | Joins Ganga near Kursela, Bihar | “Sorrow of Bihar” — frequently shifts course due to heavy silt load; 2008 Kosi flood affected 2.7 million people |
| Damodar | Chotanagpur Plateau, Jharkhand, near Chandwa | 592 km | Jharkhand, West Bengal | Barakar, Konar | Joins Hooghly River, West Bengal | Once called “Sorrow of Bengal” (before DVC); Damodar Valley Corporation (DVC, 1948) — India’s first multipurpose river valley project, modelled on TVA (USA) |
B. Brahmaputra River System
The Brahmaputra is one of the world’s largest rivers by discharge. Its basin area in India is ~1,94,413 km².
| River | Origin | Total Length | States Flowed Through | Major Tributaries | Drains Into | Key Facts |
|---|---|---|---|---|---|---|
| Brahmaputra | Chemayungdung Glacier, near Kailash-Mansarovar, Tibet (~5,150 m); called Yarlung Tsangpo in Tibet | ~2,900 km total (916 km in India) | Tibet (China), Arunachal Pradesh (Siang/Dihang), Assam (Brahmaputra), Bangladesh (Jamuna) | North bank: Subansiri, Kameng, Manas, Sankosh, Teesta; South bank: Burhi Dihing, Dhansiri (South), Kopili, Lohit, Dibang | Bay of Bengal (merges with Ganga-Padma system in Bangladesh) | Yarlung Tsangpo Grand Canyon is world’s deepest canyon; carries highest sediment load; forms Majuli — world’s largest river island; highly braided in Assam |
| Teesta | Tso Lhamo Lake / Teesta Khangtse Glacier, north Sikkim, above 5,400 m | 414 km | Sikkim, West Bengal, Bangladesh | Rangit, Rangpo | Joins Brahmaputra (Jamuna) in Bangladesh | Subject of India-Bangladesh water-sharing negotiations; key irrigation source for North Bengal |
| Subansiri | Rises in Tibet (Chayal Chu, Tsari Chu streams) | 442 km (192 km in Arunachal, 190 km in Assam) | Arunachal Pradesh, Assam | — | Joins Brahmaputra at Jamurighat, Assam | Largest tributary of Brahmaputra; Lower Subansiri Hydroelectric Project (2,000 MW — under construction) |
| Manas | Southern slopes of Himalayas, Bhutan | 376 km | Bhutan, Assam | Beki, Aie | Joins Brahmaputra near Jogighopa, Assam | Transboundary river; Manas National Park (UNESCO WHS) on its banks |
| Lohit | Eastern Tibet (Zayal Chu glacier) | ~400 km (in India) | Arunachal Pradesh, Assam | Dichu | Joins Brahmaputra near Sadiya, Assam | Considered the true source of Brahmaputra by some; flows through Mishmi Hills |
C. Indus River System
The Indus system is one of the largest in the world. In India, it drains parts of Ladakh, Jammu & Kashmir, Himachal Pradesh, and Punjab. Total basin area: ~11,65,000 km² (3,21,289 km² in India).
| River | Origin | Total Length | States/Regions in India | Major Tributaries | Drains Into | Key Facts |
|---|---|---|---|---|---|---|
| Indus (Sindhu) | Sengge Kanbab (“Lion’s Mouth”), near Lake Mansarovar / Mt. Kailash, Tibet | ~3,180 km total (~1,114 km in India) | Ladakh, Jammu & Kashmir, (then enters Pakistan) | Zanskar (left bank in Ladakh); Jhelum, Chenab, Ravi, Beas, Sutlej (in Punjab plains) | Arabian Sea (in Pakistan) | One of longest rivers in Asia; cradle of Indus Valley Civilisation (Harappa, Mohenjo-daro); Indus Waters Treaty (1960) governs India-Pakistan sharing |
| Jhelum (Vitasta) | Verinag Spring, south-eastern Kashmir Valley | ~725 km | Jammu & Kashmir (flows through Srinagar, Wular Lake) | Kishanganga (Neelum), Lidder | Joins Chenab in Pakistan | Wular Lake — largest freshwater lake in India; Kishanganga HEP dispute (India-Pakistan) |
| Chenab (Chandrabhaga) | Confluence of Chandra and Bhaga rivers at Tandi, Lahaul-Spiti, Himachal Pradesh (source: Bara-lacha Pass) | ~960 km | Himachal Pradesh, Jammu & Kashmir | Tawi, Marusudar | Joins Sutlej to form Panjnad in Pakistan | Largest river of Jammu region; Salal Dam and Baglihar Dam on Chenab |
| Ravi (Purushni) | Near Rohtang Pass, Kullu Hills, Himachal Pradesh | ~720 km | Himachal Pradesh, Punjab | Ujh, Siul | Joins Chenab in Pakistan | Eastern river under Indus Waters Treaty (allocated to India); flows past Lahore (Pakistan) |
| Beas (Vipasha) | Near Rohtang Pass, Pir Panjal Range, Himachal Pradesh, at 4,062 m | ~460 km | Himachal Pradesh, Punjab | Parvati, Spin, Bain | Joins Sutlej at Harike, Punjab | Entirely within Indian territory; Pong Dam and Pandoh Dam on Beas |
| Sutlej (Shatudri) | Near Rakshastal Lake, Kailash-Mansarovar region, Tibet | ~1,450 km total (~1,050 km in India) | Enters India at Shipki La (Himachal Pradesh); Himachal Pradesh, Punjab | Baspa, Spiti | Joins Chenab (as Panjnad) in Pakistan | Longest of the five Punjab rivers; Bhakra Nangal Dam on Sutlej; important for irrigation in Punjab and Rajasthan via Indira Gandhi Canal |
Indus Waters Treaty, 1960
| Aspect | Details |
|---|---|
| Signed | 19 September 1960, Karachi |
| Parties | India (PM Jawaharlal Nehru) and Pakistan (President Ayub Khan) |
| Mediated by | World Bank |
| Eastern Rivers (allocated to India) | Ravi, Beas, Sutlej |
| Western Rivers (allocated to Pakistan) | Indus, Jhelum, Chenab |
| India’s permitted use of Western Rivers | Non-consumptive uses: navigation, run-of-river hydropower (with design restrictions), limited storage (3.6 MAF) |
| Water share | Pakistan receives ~80% of total Indus system water; India receives ~20% |
| Institutional mechanism | Permanent Indus Commission (PIC) — bilateral body with Commissioners from each side |
| Dispute resolution | Three-tier: PIC negotiation, Neutral Expert, Court of Arbitration |
| Recent developments | India issued notice of modification in January 2023 citing Pakistan’s objections to Kishanganga and Ratle HEPs; in 2025, India suspended the Treaty after the Pahalgam terror attack (April 2025) |
Peninsular Rivers
A. East-Flowing Rivers (drain into Bay of Bengal)
| River | Origin | Total Length | States Flowed Through | Major Tributaries | Drains Into | Key Facts |
|---|---|---|---|---|---|---|
| Godavari | Brahmagiri Hills, Trimbakeshwar, Nashik, Maharashtra (Western Ghats) | 1,465 km | Maharashtra, Telangana, Andhra Pradesh, Chhattisgarh, Odisha | Left bank: Purna, Pranhita (confluence of Wainganga + Penganga + Wardha), Indravati, Sabari; Right bank: Manjira | Bay of Bengal (forms delta in AP) | Longest peninsular river; called “Dakshin Ganga” (Ganga of the South); basin: 3,12,812 km² (9.5% of India) |
| Krishna | Mahabaleshwar, Western Ghats, Maharashtra, at ~1,300 m | 1,400 km | Maharashtra, Karnataka, Telangana, Andhra Pradesh | Left bank: Bhima, Dindi, Musi, Munneru; Right bank: Ghataprabha, Malaprabha, Tungabhadra | Bay of Bengal (forms delta in AP) | Second-longest peninsular river; major inter-state dispute (Maharashtra-Karnataka-AP-Telangana); basin: 2,58,948 km² |
| Kaveri (Cauvery) | Talakaveri, Brahmagiri Range, Kodagu district, Karnataka, at 1,341 m | 800 km | Karnataka (~320 km), Tamil Nadu (~416 km), Kerala, Puducherry | Hemavati, Shimsha, Arkavathi, Lakshmana Tirtha, Kabini, Bhavani, Amaravati, Noyyal | Bay of Bengal (near Poompuhar, Mayiladuthurai, TN) | Called “Ganga of the South” (like Godavari); forms Shivasamudram Falls (one of India’s earliest hydel stations, 1902); basin: 81,155 km²; major Cauvery water dispute |
| Mahanadi | Sihawa hills, Dhamtari district, Chhattisgarh, at 442 m | 900 km | Chhattisgarh, Odisha, Jharkhand, Maharashtra | Seonath, Hasdeo, Mand, Ib, Jonk, Tel | Bay of Bengal (forms delta in Odisha) | Hirakud Dam — world’s longest earthen dam; deposits more silt than any other Indian river; basin: 1,41,589 km² |
| Subarnarekha | Nagri village, Ranchi district, Jharkhand, at 600 m | 395 km | Jharkhand, West Bengal, Odisha | Kanchi, Kharkai | Bay of Bengal (estuary between Ganga and Mahanadi deltas) | Name means “streak of gold” — gold found in river sands; industrial belt of Jamshedpur on its bank |
| Brahmani | Confluence of South Koel and Sankh rivers, near Rourkela, Odisha | 800 km | Jharkhand, Odisha | South Koel, Sankh | Bay of Bengal (shares delta with Baitarani) | Forms Bhitarkanika Mangroves delta with Baitarani; important for Odisha’s irrigation |
| Pennar (Uttara Pinakini) | Chenna Kasava Hill, Nandidurg Range, Chikkaballapura, Karnataka | 597 km | Karnataka, Andhra Pradesh | Jayamangali, Kunderu, Sagileru, Chitravathi | Bay of Bengal (near Nellore, AP) | Rain-fed; flows through Anantapur (driest district in AP) |
B. West-Flowing Rivers (drain into Arabian Sea)
Most peninsular rivers flow eastward because the Western Ghats form the main watershed. Only a few major rivers flow westward — notably through rift valleys (Narmada, Tapi) or through gaps in the Western Ghats.
| River | Origin | Total Length | States Flowed Through | Major Tributaries | Drains Into | Key Facts |
|---|---|---|---|---|---|---|
| Narmada | Amarkantak Plateau, Anuppur district, Madhya Pradesh, at ~1,057 m | 1,312 km | Madhya Pradesh (82% of basin), Gujarat (12%), Maharashtra, Chhattisgarh | Left bank: Burhner, Banjar, Sher, Shakkar, Tawa (largest), Ganjal; Right bank: Hiran, Barna, Kolar, Man, Orsang | Gulf of Khambhat, Arabian Sea | Flows through a rift valley between Vindhya (north) and Satpura (south); 5th longest Indian river; Sardar Sarovar Dam and Indira Sagar Dam on Narmada; considered holiest west-flowing river |
| Tapi (Tapti) | Multai town, Betul district, Madhya Pradesh (Satpura Range), at ~752 m | 724 km | Madhya Pradesh, Maharashtra, Gujarat | Purna, Girna, Panzara, Waghur, Bori | Gulf of Khambhat, Arabian Sea (at Surat) | Also flows through a rift valley parallel to Narmada; one of only three major rivers (Narmada, Tapi, Mahi) crossing the Deccan Plateau westward |
| Sabarmati | Aravalli Range, Udaipur district, Rajasthan | 371 km | Rajasthan (48 km), Gujarat (323 km) | Wakal, Hathmati, Vatrak, Sei | Gulf of Khambhat, Arabian Sea | Ahmedabad’s Sabarmati Riverfront is a landmark urban redevelopment; Mahatma Gandhi’s Sabarmati Ashram on its banks |
| Mahi | Northern slopes of Vindhyas, Dhar district, Madhya Pradesh, at ~500 m | 583 km | Madhya Pradesh, Rajasthan, Gujarat | Anas, Som, Jakham | Gulf of Khambhat, Arabian Sea | Kadana Dam and Wanakbori Dam on Mahi; flows through tribal belt of Rajasthan-Gujarat |
| Luni | Naga Hills, Pushkar Valley, Aravalli Range, near Ajmer, Rajasthan | 495 km | Rajasthan, Gujarat (Rann of Kutch) | Sukri, Jawai, Bandi, Guhiya | Rann of Kutch (inland drainage — does not reach Arabian Sea) | Only significant river in western Rajasthan (Thar Desert); water becomes saline after Barmer; does not reach the sea (endorheic) |
| Sharavathi | Ambutheertha, Shivamogga district, Karnataka, at 730 m | ~128 km | Karnataka | Haridravathi, Yenne Hole | Arabian Sea (near Honnavar, Karnataka) | Famous for Jog Falls (Gerosoppa Falls) — 253 m, second-highest plunge waterfall in India; Linganamakki Dam for hydropower |
| Periyar | Sivagiri Hills, Western Ghats, Kerala | 244 km | Kerala | Muthirapuzha, Mullayar, Cheruthoni, Perinjankutty | Arabian Sea (at Kochi backwaters) | Longest river in Kerala; Idukki Dam and Mullaperiyar Dam on Periyar; key interstate dispute (Kerala-Tamil Nadu) |
| Bharathappuzha (Nila) | Anamalai Hills, Western Ghats, Tamil Nadu (flows west through Palakkad Gap) | 209 km | Tamil Nadu, Kerala | Gayathripuzha, Chitturpuzha, Kalpathipuzha | Arabian Sea (at Ponnani, Kerala) | Second-longest river in Kerala; flows through Palakkad Gap (only significant break in Western Ghats); culturally significant as “Nila” |
Major Dams of India
India has over 5,300 large dams (per CWC, 2024). The table below covers the most UPSC-relevant dams.
Superlatives at a Glance
| Superlative | Dam | River | State | Detail |
|---|---|---|---|---|
| Tallest dam | Tehri Dam | Bhagirathi | Uttarakhand | 260.5 m (earth-and-rock-fill) |
| Second tallest | Bhakra Dam | Sutlej | Himachal Pradesh/Punjab | 226 m (concrete gravity) |
| Longest dam | Hirakud Dam | Mahanadi | Odisha | 25.8 km (including dykes) |
| Oldest functional dam | Kallanai (Grand Anicut) | Kaveri | Tamil Nadu | Built ~2nd century AD by Chola king Karikalan |
| Largest reservoir by capacity | Indira Sagar Dam | Narmada | Madhya Pradesh | 12.22 BCM |
| First major post-independence project | Hirakud Dam | Mahanadi | Odisha | Commissioned 1957 |
| Highest arch dam in India | Idukki Dam | Periyar | Kerala | 168.9 m (double-curvature thin arch) |
Comprehensive Dam Table
| Dam | River | State | Type | Height (m) | Commissioned | Purpose | Notable Facts |
|---|---|---|---|---|---|---|---|
| Tehri Dam | Bhagirathi | Uttarakhand | Earth-and-rock-fill | 260.5 | 2006 | Hydropower (1,000 MW), irrigation, water supply | Tallest dam in India; 10th tallest in world; reservoir: Tehri Lake |
| Bhakra Nangal Dam | Sutlej | Himachal Pradesh (dam); Punjab (Nangal barrage) | Concrete gravity | 226 | 1963 | Hydropower (1,325 MW), irrigation | Second tallest; reservoir: Gobind Sagar Lake; Nehru called it “New Temple of Resurgent India” |
| Hirakud Dam | Mahanadi | Odisha (Sambalpur) | Composite (earth, concrete, masonry) | 61 | 1957 | Flood control, irrigation, hydropower (307.5 MW) | Longest dam in India (25.8 km); one of world’s longest; first major post-independence dam |
| Nagarjuna Sagar Dam | Krishna | Telangana-Andhra Pradesh border | Masonry gravity | 124 | 1967 | Irrigation, hydropower (816 MW) | One of world’s largest masonry dams; created Nagarjuna Sagar Lake; named after Buddhist scholar Nagarjuna |
| Sardar Sarovar Dam | Narmada | Gujarat (Navagam) | Concrete gravity | 163 | 2017 (full height) | Irrigation, drinking water, hydropower (1,450 MW) | Largest dam by volume in India; part of Narmada Valley Development Project; Narmada Bachao Andolan (Medha Patkar) controversy |
| Indira Sagar Dam | Narmada | Madhya Pradesh (Khandwa) | Concrete gravity | 92 | 2005 | Hydropower (1,000 MW), irrigation | Largest reservoir in India (12.22 BCM capacity); part of Narmada Valley Project |
| Idukki Dam | Periyar | Kerala (Idukki) | Double-curvature thin arch | 168.9 | 1975-76 | Hydropower (780 MW) | Highest arch dam in India; Asia’s first arch dam; built between two granite hills (Kuravan and Kurathi) |
| Koyna Dam | Koyna (tributary of Krishna) | Maharashtra (Satara) | Rubble-concrete gravity | 103.2 | 1964 | Hydropower (1,960 MW) | Koyna earthquake (1967, M 6.3) — one of India’s worst reservoir-induced earthquakes; second-largest hydel project in India |
| Mettur Dam | Kaveri | Tamil Nadu (Salem) | Gravity masonry | 65 | 1934 | Irrigation, hydropower (280 MW) | Largest dam in Tamil Nadu; Stanley Reservoir; opening of Mettur Dam (June 12) is a major event in TN agriculture |
| Krishna Raja Sagara (KRS) | Kaveri | Karnataka (Mandya-Mysuru) | Gravity masonry | 40 | 1932 | Irrigation, drinking water for Mysuru and Bengaluru | Designed by Sir M. Visvesvaraya; Brindavan Gardens adjacent; built under Mysore’s Maharaja Krishnaraja Wadiyar IV |
| Mullaperiyar Dam | Periyar | Kerala (Idukki) — but operated by Tamil Nadu | Gravity (lime-surki masonry, no cement) | 53.7 | 1895 | Irrigation and drinking water for 5 TN districts | One of oldest functioning dams; 130+ years old; major Kerala-TN dispute over dam safety and water level (136 ft vs 142 ft); Supreme Court-appointed Supervisory Committee |
| Tungabhadra Dam | Tungabhadra | Karnataka (Hosapete/Bellary) | Stone masonry | 49.5 | 1953 | Irrigation, hydropower | Largest stone masonry dam in India (non-cement); joint project of Karnataka and Andhra Pradesh; Tungabhadra Board manages it |
| Srisailam Dam | Krishna | Andhra Pradesh (Kurnool-Nandyal) | Concrete gravity | 145 | 1981 | Hydropower (1,670 MW), irrigation | Deep gorge dam; Srisailam temple (Jyotirlinga) nearby; one of highest-capacity hydel projects |
| Almatti Dam | Krishna | Karnataka (Bagalkot-Vijayapura) | Earth-cum-masonry | ~52 (structural) | 2005 | Irrigation, hydropower | Also called Lal Bahadur Shastri Dam; part of Upper Krishna Project; height-raise dispute between Karnataka and Maharashtra |
| Rihand Dam | Rihand (tributary of Son) | Uttar Pradesh (Sonbhadra) | Concrete gravity | 91.5 | 1962 | Hydropower (300 MW), irrigation | Creates Govind Ballabh Pant Sagar — largest artificial lake in India by area |
| Bansagar Dam | Son | Madhya Pradesh (Shahdol) | Concrete gravity | 67 | 2006 (completed); inaugurated 2018 | Irrigation, hydropower, flood control | Joint project of MP, UP, Bihar; construction began 1978; took nearly 3 decades |
| Pong Dam | Beas | Himachal Pradesh (Kangra) | Earth-fill | 133 | 1974 | Hydropower (396 MW), irrigation, flood control | Creates Maharana Pratap Sagar lake; Pong Dam Lake is a Ramsar Wetland Site |
| Salal Dam | Chenab | Jammu & Kashmir (Reasi) | Concrete gravity | 113 | 1987 | Hydropower (690 MW) | Built under Indus Waters Treaty provisions for run-of-river on Western Rivers |
| Baglihar Dam | Chenab | Jammu & Kashmir (Doda-Ramban) | Concrete gravity | 144.5 | 2008 (Phase I) | Hydropower (900 MW) | Contested by Pakistan under Indus Waters Treaty; World Bank Neutral Expert ruled in India’s favour (2007) |
River Interlinking Projects
Background
The National Perspective Plan (NPP) for interlinking rivers was prepared by the Ministry of Water Resources in 1980, based on two components:
- Himalayan Rivers Development — 14 link projects to transfer water from Ganga-Brahmaputra systems to western and southern India
- Peninsular Rivers Development — 16 link projects among peninsular rivers
The National Water Development Agency (NWDA), established in 1982, is the nodal agency for preparing feasibility reports and DPRs.
Progress (as of 2025)
| Stage | Status |
|---|---|
| Pre-Feasibility Reports (PFRs) | Completed for all 30 links |
| Feasibility Reports (FRs) | Completed for 26 links |
| Detailed Project Reports (DPRs) | Completed for 11 links |
Ken-Betwa Link Project (India’s First Approved Link)
| Aspect | Details |
|---|---|
| Rivers linked | Ken (surplus) to Betwa (deficit) |
| States | Madhya Pradesh (donor) and Uttar Pradesh (recipient) |
| Region benefited | Bundelkhand (drought-prone) |
| Approved cost | Rs 44,605 crore (revised) |
| Foundation stone | Laid by PM Modi at Khajuraho, MP (2023) |
| Key components | Daudhan Dam (77 m tall, 2 km wide) on Ken River; 230 km Ken-Betwa link canal; Low-level and high-level tunnels |
| Expected benefits | Irrigation: 10.62 lakh hectares; Drinking water: 62 lakh people; Hydropower: 103 MW; Solar: 27 MW |
| Phases | Phase I: Daudhan Dam, link canal, powerhouses; Phase II: Lower Orr Dam, Bina Complex, Kotha Barrage |
| Environmental concern | Submerges ~9,000 hectares of Panna Tiger Reserve (critical tiger habitat) |
Other Priority Link Projects
| Link | Rivers Connected | States | Status (2025) |
|---|---|---|---|
| Damanganga-Pinjal | Damanganga to Pinjal (Vaitarna) | Gujarat, Maharashtra | DPR completed; to supply water to Greater Mumbai |
| Par-Tapi-Narmada | Par, Nar, Auranga, Ambica, Purna to Tapi and Narmada | Gujarat, Maharashtra | DPR completed; to supply water to Saurashtra and Kutch |
| Godavari (Inchampalli)-Krishna (Nagarjunasagar) | Godavari surplus to Krishna | Telangana, Andhra Pradesh | DPR completed |
| Krishna-Pennar | Krishna surplus to Pennar | Andhra Pradesh | FR completed |
| Pennar-Cauvery | Pennar surplus to Cauvery | Andhra Pradesh, Tamil Nadu | FR completed |
Major Inter-State River Water Disputes
Governing framework: Inter-State River Water Disputes Act, 1956 (under Article 262 of the Constitution). The Act provides for setting up of ad hoc Tribunals to adjudicate disputes. Their decisions are final and binding (not appealable in the Supreme Court as per Article 262(2), though the SC has intervened via writ jurisdiction under Article 32).
Active and Resolved Disputes
| Dispute | River | States Involved | Tribunal | Key Award / Status |
|---|---|---|---|---|
| Cauvery Water Dispute | Kaveri | Karnataka, Tamil Nadu, Kerala, Puducherry | Cauvery Water Disputes Tribunal (CWDT), constituted 1990 | CWDT award (2007): TN 419 tmcft, Karnataka 270 tmcft, Kerala 30 tmcft, Puducherry 7 tmcft. SC modified (Feb 2018): TN 404.25 tmcft, Karnataka 284.75 tmcft, rest same. Cauvery Water Management Authority (CWMA) created June 2018 and Cauvery Water Regulation Committee (CWRC) created to implement the order. |
| Krishna Water Dispute | Krishna | Maharashtra, Karnataka, Andhra Pradesh, Telangana | KWDT-I (1969), KWDT-II (2004) | KWDT-I (Bachawat Tribunal, 1976): allocated 560 tmcft among 3 states. KWDT-II (Brijesh Kumar Tribunal, 2010): revised allocation considering 65% dependability. After bifurcation of AP (2014), Telangana became party; allocation between AP and Telangana remains sub judice. |
| Narmada Water Dispute | Narmada | Gujarat, Madhya Pradesh, Maharashtra, Rajasthan | Narmada Water Disputes Tribunal (1969) | Final award (1979): Gujarat 9 MAF, MP 18.25 MAF, Maharashtra 0.25 MAF, Rajasthan 0.50 MAF. Led to Sardar Sarovar and other dam projects. |
| Mahadayi/Mandovi Dispute | Mahadayi (Mandovi) | Goa, Karnataka, Maharashtra | Mahadayi Water Disputes Tribunal (MWDT), constituted 2010 | MWDT award (Aug 2018): Goa 24 tmcft, Karnataka 5.4 tmcft (including 3.9 tmcft for Kalasa-Banduri diversion to Malaprabha), Maharashtra 1.33 tmcft. All 3 states filed SLPs in SC; pending as of 2025. Karnataka’s Kalasa-Banduri project contested by Goa. |
| Mullaperiyar Dam Dispute | Periyar | Kerala, Tamil Nadu | No tribunal — Supreme Court directly | Dam built in 1895 under 999-year lease by British Madras Presidency; located in Kerala but operated by TN. Kerala wants dam decommissioned (safety fears); TN wants water level raised to 142 ft. SC (2014) fixed water level at 142 ft; ordered dam strengthening. SC-appointed Supervisory Committee monitors. In 2025, SC called the states “fighting like school children.” Kerala NGO petition for decommissioning pending (notice issued Oct 2025). |
| Ravi-Beas / SYL Canal Dispute | Ravi, Beas, Sutlej | Punjab, Haryana, Rajasthan | Eradi Tribunal (1986) | Background: Post-1966 reorganisation, Haryana demanded share of Ravi-Beas waters. Sutlej-Yamuna Link (SYL) Canal (214 km — 122 km in Punjab, 92 km in Haryana) planned to carry Haryana’s share. Foundation laid by PM Indira Gandhi (1982). Punjab denotified land (2004, by state law); SC struck down the law. Construction stalled for decades. In 2025, SC directed Punjab and Haryana to cooperate with Centre. Matter unresolved as of March 2026. Water availability has declined from 17.17 MAF (1981 estimate) to ~13.38 MAF. |
| Mahanadi Water Dispute | Mahanadi | Odisha, Chhattisgarh | Mahanadi Water Disputes Tribunal (constituted 2018) | Odisha alleges Chhattisgarh is building barrages reducing water flow. Tribunal proceedings ongoing. |
National River Conservation Programmes
Namami Gange Programme
| Aspect | Details |
|---|---|
| Launched | June 2014 (as Flagship Programme by the Union Government) |
| Predecessor | Ganga Action Plan (Phase I: 1985, Phase II: 1993); National River Conservation Plan (1995) |
| Implementing agency | National Mission for Clean Ganga (NMCG), under Ministry of Jal Shakti |
| Namami Gange Mission-I budget | Rs 20,000 crore |
| Namami Gange Mission-II | Approved December 2023; Rs 22,500 crore till 2026; total allocation since inception: Rs 26,824.86 crore (up to FY 2025-26) |
| Pillars | Sewerage treatment infrastructure; Industrial effluent monitoring; River surface cleaning; Biodiversity conservation; Afforestation (forestry interventions); Public awareness |
| Achievement (2025) | 492 projects initiated (Rs 40,121 crore); 307+ projects completed; 138+ sewage treatment plants (STPs) operational with 3,977 MLD capacity; 25 new STPs (530 MLD) commissioned in 2025 |
| Ecological impact | Gangetic dolphin population increased; Dissolved Oxygen levels within acceptable bathing water criteria |
| Arth Ganga | Concept of economic value from Ganga rejuvenation — integration of livelihoods, organic farming, tourism with conservation |
National River Conservation Plan (NRCP)
| Aspect | Details |
|---|---|
| Launched | 1995 (expanded Ganga Action Plan to cover all major polluted rivers) |
| Coverage | 45 rivers in 178 towns across 20 states (as of last report) |
| Objective | Reduce pollution load by interception, diversion, and treatment of sewage and industrial effluent |
| Key rivers covered | Yamuna, Gomti, Godavari, Krishna, Kaveri, Damodar, Sutlej, Mahanadi, Sabarmati, and others |
| Current status | Merged into Namami Gange for Ganga basin rivers; standalone NRCP continues for other rivers under National River Conservation Directorate (NRCD) |
National Water Policy (2012)
India has had three National Water Policies — 1987, 2002, and 2012. Key features of the latest (2012) policy:
- Water to be treated as an economic good to promote conservation
- Priority of allocation: (1) Drinking water, (2) Irrigation, (3) Hydropower, (4) Ecology, (5) Agro-industries, (6) Non-agricultural industries, (7) Navigation
- Recommended a National Water Framework Law
- Emphasis on demand management, water-use efficiency, and participatory irrigation management (PIM)
- Ecological needs of rivers to be determined and maintained
- Inter-basin water transfer to be considered after meeting in-basin needs
- Water pricing to reflect full economic cost including environmental externalities
- Groundwater regulation and community participation emphasised
UPSC Relevance
Prelims: River origins, tributaries, inter-state disputes, dam-river-state matching, superlatives (tallest/longest/oldest dam), Indus Waters Treaty, Cauvery allocation, Article 262, NWDA, Namami Gange
Mains GS-1: Physical geography of rivers (Himalayan vs Peninsular classification, drainage patterns, delta formation, rift valley rivers); Major dams and their socio-economic impact
Mains GS-2: Inter-state river water disputes under Article 262; constitutional provisions; tribunals under ISRWDA, 1956; centre-state relations in water governance; federalism and cooperative federalism in water sharing
Mains GS-3: Water resources management; river interlinking — benefits and ecological concerns; Namami Gange; irrigation and food security; dam safety and Disaster Management; National Water Policy
Essay/Interview: “Water: the new oil — managing India’s water conflicts” / “Is river interlinking the solution to India’s water crisis?” / Role of judiciary in resolving inter-state disputes
Facts Corner – Knowledgepedia
India’s River Systems — Core Data:
- Total rivers and tributaries in India: ~400+ (including minor streams)
- Total water resources: ~1,999 BCM; utilisable: ~1,123 BCM (690 BCM surface + 433 BCM groundwater)
- Average annual rainfall: ~1,170 mm
- Ganga basin area: ~8,61,452 km² (26.3% of India’s area); supports ~43% of population
- Brahmaputra total length: ~2,900 km (916 km in India)
- Indus total length: ~3,180 km (~1,114 km in India)
- Longest river entirely in India: Ganga (2,525 km)
- Longest peninsular river: Godavari (1,465 km)
- National River: Ganga (declared 2008)
- National Aquatic Animal: Gangetic dolphin (Platanista gangetica)
Himalayan vs Peninsular Rivers:
- Himalayan rivers are perennial (snow + rain fed); Peninsular rivers are seasonal (rain-fed)
- Only exceptions: Narmada and Tapi are west-flowing rift valley rivers; most peninsular rivers flow east
- Ganga and Brahmaputra form the world’s largest delta — Sundarbans
- Majuli (Assam) — world’s largest river island, on Brahmaputra
Indus Waters Treaty, 1960:
- Signed: 19 September 1960, Karachi
- Eastern Rivers (to India): Ravi, Beas, Sutlej
- Western Rivers (to Pakistan): Indus, Jhelum, Chenab
- India gets ~20%, Pakistan gets ~80% of total water
- Mediated by World Bank
- India suspended the Treaty in April 2025 after the Pahalgam terror attack
Dam Superlatives:
- Tallest dam: Tehri Dam (260.5 m) — Bhagirathi, Uttarakhand
- Longest dam: Hirakud Dam (25.8 km) — Mahanadi, Odisha
- Oldest dam: Kallanai/Grand Anicut (~2nd century AD) — Kaveri, Tamil Nadu
- Highest arch dam: Idukki Dam (168.9 m) — Periyar, Kerala
- Largest reservoir: Indira Sagar (12.22 BCM) — Narmada, MP
- Largest artificial lake by area: Govind Ballabh Pant Sagar (Rihand Dam, UP)
River Nicknames:
- Kosi: “Sorrow of Bihar”
- Damodar: “Sorrow of Bengal” (before DVC)
- Godavari: “Dakshin Ganga” (Ganga of the South)
- Kaveri: also called “Ganga of the South”
- Brahmaputra: “Tsangpo” (Tibet), “Siang/Dihang” (Arunachal), “Jamuna” (Bangladesh)
Key Inter-State Disputes:
- Cauvery: SC (2018) — TN 404.25 tmcft, Karnataka 284.75 tmcft; CWMA and CWRC created
- Krishna: KWDT-I (1976) and KWDT-II (2010); Telangana added post-2014 bifurcation
- Narmada: Award (1979) — Gujarat 9 MAF, MP 18.25 MAF
- Mahadayi: Award (2018) — Goa 24 tmcft, Karnataka 5.4 tmcft; Kalasa-Banduri project contested
- Mullaperiyar: 130+ year old dam; SC fixed 142 ft water level; decommissioning plea pending (2025)
- SYL Canal (Ravi-Beas): Punjab-Haryana; 214 km canal incomplete since 1982; water availability declined from 17.17 to ~13.38 MAF
Constitutional and Legal Framework:
- Water is State subject (Entry 17, State List)
- Article 262: Parliament may provide for adjudication of inter-state river disputes
- Inter-State River Water Disputes Act, 1956 (amended 2002)
- River Boards Act, 1956
- Dam Safety Act, 2021 — provides for surveillance, inspection, operation and maintenance of all large dams
River Interlinking:
- National Perspective Plan (1980): 30 links (14 Himalayan + 16 Peninsular)
- NWDA (1982): Nodal agency
- Ken-Betwa Link: First approved project; Rs 44,605 crore; 10.62 lakh hectares irrigation; 103 MW hydro; 27 MW solar
- DPRs completed for 11 of 30 links (as of 2025)
Namami Gange:
- Launched: June 2014; Total budget (Mission I+II): ~Rs 42,500 crore
- Implementing agency: NMCG under Ministry of Jal Shakti
- 492 projects initiated; 307+ completed; 138+ STPs operational (3,977 MLD)
- Arth Ganga: Economic model linking river rejuvenation with livelihoods
Other Relevant Facts:
- Damodar Valley Corporation (DVC, 1948): India’s first multipurpose river valley project, modelled on USA’s Tennessee Valley Authority (TVA)
- Shivasamudram Falls on Kaveri: One of India’s earliest hydroelectric stations (1902)
- Jog Falls on Sharavathi: ~253 m, second-highest plunge waterfall in India
- Koyna earthquake (1967, M 6.3): Reservoir-induced seismicity — key case study for UPSC
- India has 5,300+ large dams (per CWC); ranks third globally after China and USA in number of large dams
- Dam Safety Act, 2021: First comprehensive national law on dam safety; establishes National and State Dam Safety Authorities
- Farakka Barrage (1975): On Ganga in West Bengal; diverts water to Hooghly to flush silt and maintain Kolkata Port; India-Bangladesh sharing governed by 1996 Ganga Waters Treaty
Sources: CWC, Ministry of Jal Shakti, NWDA, India-WRIS, Namami Gange (NMCG), PIB, Wikipedia, Britannica, Drishti IAS
