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Rivers and Water Resources

Part of the KPSC KAS study roadmap. General Studies topic geogra-002 of General Studies.

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Rivers and Water Resources

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Rivers and Water Resources — Key Facts for KPSC KAS • Major River Systems: Indus (Sindhu), Ganga, Brahmaputra, Mahanadi, Godavari, Krishna, Cauvery, Narmada, Taptapi. • Indus System: Rises in Tibet (Kailash Range); enters India through Jammu & Kashmir; tributaries: Satluj, Beas, Ravi, Chenab, Jhelum. Total length: 2,880 km (1,114 km in India). • Ganga System: Rises from Gangotri Glacier (Bhagirathi and Alaknanda at Devprayag); Brahmaputra joins in Bangladesh as Padma. Total basin: 1,086,000 sq km. • Peninsular Rivers (non-perennial, rain-fed): Mahanadi (851 km), Godavari (1,465 km — largest peninsular), Krishna (1,400 km), Cauvery (800 km), Narmada (1,312 km). • Dams: Bakra Nangal (Punjab), Hirakud (Odisha), Nagarjuna Sagar (Telangana-Andhra Pradesh border), ** Sardar Sarovar** (Gujarat, Narmada). • Floods: Major recurring disaster — 2013 North India floods (Uttarakhand), 2015 Chennai floods, 2019 Maharashtra floods. National Disaster Response Force (NDRF) deployment.

⚡ Exam tip: KPSC KAS frequently asks about river-linking projects, dam controversies, river basin comparisons, and water-sharing disputes between states. Karnataka-specific questions often involve the Krishna and Cauvery water disputes.

🟡 Standard — Regular Study (2d–2mo)

Standard content.

Rivers and Water Resources — KPSC KAS Study Guide

Major River Systems of India

Himalayan River Systems

Himalayan rivers are perennial (snow and glacier-fed) with well-developed dendritic drainage patterns. They traverse the mountains through V-shaped valleys before depositing huge quantities of sediments in the northern plains.

Indus River System:

  • Indus proper: Rises near Lake Mansarovar (Tibet); flows through Ladakh; enters Pakistan; empties into Arabian Sea
  • Jhelum: Rises from Verinag (Kashmir); flows through Srinagar; Wular Lake acts as reservoir
  • Chenab: Formed by confluence of Ravi and Beas in Punjab; major hydroelectric potential
  • Ravi: Rises from Rohtang Pass area (Himachal); flows through Kangra valley
  • Beas: Rises from Rohtang Pass; unique as it does not enter Pakistan
  • Satluj: Rises from Rakshastal Lake (Tibet); passes through Bhakra Nangal Dam; Sutlej Project

Ganga River System:

  • Ganga proper: Formed at Devprayag (Uttarakhand) by confluence of Alaknanda and Bhagirathi
  • Yamuna: Largest tributary; rises from Yamunotri glacier; joins Ganga at Allahabad (Triveni Sangam); receives water from most Peninsular rivers through the Western Yamuna Canal
  • Ghaghara: Originates in Tibet (Mapchacho); largest tributary by length
  • Gandak: Rises in Nepal Himalayas
  • Kosi: Rises in Nepal; known as the “Sorrow of Bihar” due to devastating floods
  • Mahananda: Rises in Darjeeling hills; joins Ganga in West Bengal
  • Son: Rises from Amarkantak plateau (Madhya Pradesh); joins Ganga near Patna

Brahmaputra River System:

  • Rises in Kailash Range (Tibet) as Tsangpo; enters India through Arunachal Pradesh (名为 Dihang); major tributaries: Dibang, Lohit
  • Known as Jamuna in Bangladesh; joins Ganga as Padma; empties into Bay of Bengal through the Meghna estuary
  • Characterized by braided channels and shifting course (avulsion) — the Majuli Island (Assam) is gradually being eroded

Peninsular River Systems

Peninsular rivers are non-perennial, primarily rain-fed with some groundwater contributions. They have trellis and dendritic drainage patterns with older, more resistant rock and less vertical erosion.

Narmada River:

  • Rises from Amarkantak Plateau (Madhya Pradesh); flows west through a rift valley between Vindhya and Satpura ranges; empties into Gulf of Khambhat (Arabian Sea)
  • Famous for Sardar Sarovar Dam (Gujarat) — controversial but completed; Narmada Bachao Andolan led by Medha Patkar
  • Length: 1,312 km

Taptapi River:

  • Rises from Satpura range (Madhya Pradesh); flows south through Maharashtra and Gujarat; joins Narmada near Bharuch
  • Tapi Dam (Koyna, Maharashtra) — one of India’s largest dam projects

Mahanadi River:

  • Rises from Raipur district (Chhattisgarh); flows east through Odisha; empties into Bay of Bengal near Cuttack
  • Hirakud Dam (Odisha) — India’s first major multi-purpose river valley project (1957)
  • Basin covers Odisha, Chhattisgarh, Jharkhand, Maharashtra

Godavari River:

  • Rises from Nashik district (Maharashtra) near Trimbakeshwar; flows east through Deccan; empties into Bay of Bengal near Rajahmundry (Andhra Pradesh)
  • Largest Peninsular river; also called Dakshina Ganga
  • Major tributaries: Pranita (78 km), Purna, Pranhita (largest, 676 km with combined Penganga)
  • Nagarjuna Sagar Dam (Telangana-Andhra Pradesh border) — India’s largest masonry dam

Krishna River:

  • Rises from Mahabaleshwar (Maharashtra); flows east through Karnataka, Telangana, Andhra Pradesh; joins Godavari at Kallampudi
  • Major hydroelectric projects: Koyna Dam (Maharashtra — first major irrigation project in western India), Tungabhadra Dam (Karnataka)
  • Important tributary: Tungabhadra (from Karnataka highlands)

Cauvery River:

  • Rises from Brahmagiri Range (Karnataka); flows through Karnataka-Tamil Nadu border; empties into Bay of Bengal near Poompuhar
  • Karnataka’s most important river; known as the Ganga of the South
  • Major dams: KRS (Krishnarajasagara) Dam (1914) near Mysore, Mettur Dam (Tamil Nadu — largest reservoir)
  • Cauvery Water Dispute: Long-standing dispute between Karnataka and Tamil Nadu over water sharing (1980s-2020s); Karnataka’s position: riparian state; Tamil Nadu’s position: lower riparian with prior appropriation

🔴 Extended — Deep Study (3mo+)

Comprehensive coverage.

Rivers and Water Resources — Comprehensive KPSC KAS Notes

Water Resource Management: Issues and Projects

Inter-State Water Disputes

India’s federal structure creates inherent tensions over water resources, as rivers frequently cross state boundaries and states have competing developmental priorities.

Cauvery Water Dispute — A Detailed Case Study:

The Cauvery dispute between Karnataka and Tamil Nadu is one of India’s longest-running water conflicts. Key dimensions:

  1. Hydrological facts: Cauvery’s total usable water is approximately 14-15 thousand million cubic feet (tmc ft). Tamil Nadu argues it has been using waters since the 11th century (Chola-era anicuts). Karnataka argues it’s the upper riparian state.

  2. Legal history: The dispute began in 1980s when Karnataka opposed Tamil Nadu’s expansion of irrigation. Cauvery Water Disputes Tribunal (CWDT) was constituted in 1990 under the Inter-State Water Disputes Act (1956).

  3. CWDT Order (2013): Allocated approximately 419 tmc ft to Tamil Nadu, 270 tmc ft to Karnataka, 10 tmc ft to Kerala, 7 tmc ft to Puducherry. Karnataka was required to build check dams; Tamil Nadu’s existing uses were recognized.

  4. Implementation problems: Karnataka’s non-implementation of tribunal orders (partially due to state political opposition); Supreme Court interventions; 2016-2018 protests in Karnataka over water sharing

  5. Karnataka-specific concern: The Cauvery basin accounts for approximately 80% of Karnataka’s irrigated agriculture; rapid urbanization in Bangalore (now Bengaluru) has increased urban water demand on the same basin.

Krishna Water Dispute:

  • Disputes between Karnataka, Maharashtra, and Andhra Pradesh over the Krishna river waters
  • Krishna Water Disputes Tribunal (1976): Allocated waters — Maharashtra 560 tmc ft, Karnataka 700 tmc ft, Andhra Pradesh 800 tmc ft
  • Karnataka’s Upper Krishna Project built despite tribunal objections
  • Alagar (Karnataka’s KRS Dam) serves as the major reservoir

Narmada Water Dispute:

  • Narmada Water Disputes Tribunal (1969): Adjudicated sharing among Madhya Pradesh (dominant riparian), Gujarat, Maharashtra, Rajasthan
  • Sardar Sarovar Dam: Height controversy; Narmada Bachao Andolan; Supreme Court approved construction in 2000
  • Madhya Pradesh’s concern: maximum submergence area in the state but minimum irrigation benefit

Major River Valley Projects

Bhakra Nangal Project (Punjab-Himachal Pradesh border):

  • Bakra Dam (1954) on Sutlej: 226 metres high; second-highest in Asia at time of construction
  • Nangal Dam (1954) as downstream barrage
  • Nangal Hydel Channels: Irrigation and drinking water

Hirakud Project (Odisha):

  • Built on Mahanadi River near Sambalpur; world’s longest earthen dam (25 km)
  • Multi-purpose: irrigation, flood control, hydroelectricity
  • Burla power station; provides electricity to Odisha’s grid

Dams in Karnataka:

  • KRS (Krishnarajasagara) Dam (1914): Built by Diwan of Mysore, Krishnaraja Wodeyar IV; one of India’s oldest major dams; serves Mysore and Bangalore water supply
  • Kudgi Power Project (Bhadra River, Bijapur): Thermal power (not hydro); 4,000 MW planned
  • Upper Krishna Project (Karnataka): Tungabhadra tributary; controversial over water-sharing

National River Linking Project

The National Water Project (linking of Indian rivers) is an ambitious inter-basin transfer scheme proposed by the Madhav Gadgil Committee and later the Kochrab Task Force:

Concept: Connect Himalayan rivers (north-south) with peninsular rivers (east-west) via canals to transfer surplus water from flood-prone regions to drought-prone regions.

Key Links:

  • Mahanadi (Odisha) → Krishna (Andhra Pradesh)
  • Ken Betwa Link (Madhya Pradesh-Uttar Pradesh) — first project approved (2021); transfers water from Ken River to Betwa River
  • Ganga → Brahmaputra transfer (controversial; environmental concerns)

Criticisms:

  • Massive displacement of communities (estimated 1-2 million people)
  • Ecological damage to riverine ecosystems
  • Environmental concerns: River ecology disruption, groundwater table changes, sediment deposition
  • Social justice concerns: Tribal communities in proposed reservoir areas

Flood Management in India

India experiences recurrent flooding in major river systems:

Ganga Basin Floods:

  • Kosi River — known as “Sorrow of Bihar”; shifts course dramatically (avulsion); 2019 floods affected 6 million people
  • Brahmaputra — annual flooding in Assam; 2019 floods affected 30 districts

Mahanadi and Odisha Floods:

  • 2019 Odisha floods (Mahanadi system): 1 million hectares affected; coordination between Odisha and Chhattisgarh

Flood Management Strategies:

  1. Structural measures: Embankments, levees, dams, floodways (e.g., Kosi Project in Bihar)
  2. Non-structural measures: Flood plain zoning, weather forecasting, flood warning systems
  3. National Flood Management Programme (NFMP): Centrally sponsored scheme with 75:25 center-state funding
  4. NDMA Guidelines: On managing reservoirs during flood season

Groundwater Crisis

India is the world’s largest groundwater user:

  • 85% of rural drinking water
  • 65% of irrigation water
  • Central Ground Water Board (CGWB): Monitors groundwater levels

Critical Issues:

  • Aquifer depletion: Punjab, Haryana, Rajasthan, Gujarat showing declining water tables
  • Contamination: Fluoride (Rajasthan), arsenic (West Bengal, Bihar, Assam), nitrate (agricultural areas)
  • Over-extraction for irrigation: Punjab agriculture is unsustainable without recharging
  • India’s ranking: Second globally in groundwater extraction after China

Solutions:

  • Atal Bhujal Yojana (2020): National groundwater management scheme
  • Jal Shakti Ministry (2019): Consolidated water resources under single ministry
  • M Micro-watershed development: Community-based groundwater management

Examination Strategy

KPSC KAS commonly asks:

  1. Karnataka-specific: Cauvery and Krishna water disputes; major dams in Karnataka; river basins in Karnataka
  2. Compare Himalayan and Peninsular rivers
  3. Inter-state water dispute mechanisms (Inter-State Water Disputes Act, 1956)
  4. Environmental impacts of large dams
  5. Groundwater crisis and solutions

Key concepts to master:

  • Perennial vs non-perennial rivers
  • Inter-state vs intra-state rivers
  • Riparian doctrine vs prior appropriation (Indian law generally follows riparian doctrine but recognizes prior use)
  • Tribal rights and dam displacement (Forest Rights Act, 2006; PESA, 1996)
  • River-linking debates — arguments for and against

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