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Indian Geography (SSC, Railway, Police & All State exam)Chapter Unit

Drainage System, Rivers, Major Lakes, and Waterfalls

Introduction to Drainage Systems

The drainage system in India refers to the network of rivers, streams, and their tributaries. It can be broadly classified into:

  1. Himalayan Drainage System:

    • Originates in the Himalayan mountain ranges.
    • Rivers are perennial (flow throughout the year) due to glacial and monsoon-fed water sources.
    • Features include deep valleys, meanders, and oxbow lakes.
    • Examples: Indus, Ganga, Brahmaputra.

  2. Peninsular Drainage System:

    • Originates in the Peninsular Plateau and central highlands.
    • Rivers are seasonal, dependent on rainfall.
    • Exhibit mature stages of river development with broad valleys and deltas.
    • Examples: Godavari, Krishna, Kaveri, Narmada, Tapi.

Himalayan Drainage System

  1. Characteristics:

    • Rivers are antecedent (older than the Himalayan mountains) and follow dendritic drainage patterns.
    • Flow through steep valleys, creating rapids and waterfalls.
    • Contribute significant alluvial deposits to the Northern Plains.

  2. Major River Systems:

    • The Indus River System:
      • Origin: Mansarovar Lake, Tibet.
      • Tributaries: Jhelum, Chenab, Ravi, Beas, Sutlej.
      • Drainage Basin: Covers parts of Jammu and Kashmir, Himachal Pradesh, Punjab, and Haryana before entering Pakistan.
    • The Ganga River System:
      • Origin: Gangotri Glacier (Bhagirathi River), Uttarakhand.
      • Tributaries: Yamuna, Gomti, Ghaghara, Gandak, Kosi.
      • Drainage Basin: Covers Uttar Pradesh, Bihar, Jharkhand, and West Bengal.
    • The Brahmaputra River System:
      • Origin: Angsi Glacier, Tibet (known as Yarlung Tsangpo in Tibet).
      • Features: Massive floods, braided channels.
      • Drainage Basin: Covers Arunachal Pradesh, Assam, and Bangladesh.

Peninsular Drainage System

  1. Characteristics:

    • Rivers are younger, have a shorter course, and exhibit radial, trellis, or rectangular drainage patterns.
    • Flow through plateaus and plains with moderate gradients.
    • Exhibit less erosional activity compared to Himalayan rivers.

  2. Major River Systems:

    • East-Flowing Rivers (Drain into Bay of Bengal):
      • Godavari: Longest peninsular river; originates in Maharashtra.
      • Krishna: Originates in Maharashtra, flows through Karnataka and Andhra Pradesh.
      • Kaveri: Known for fertile deltas; originates in Karnataka.
      • Mahanadi: Originates in Chhattisgarh and flows through Odisha.
    • West-Flowing Rivers (Drain into Arabian Sea):
      • Narmada: Originates from Amarkantak Plateau, flows through rift valleys.
      • Tapi: Parallel to Narmada, originates in Madhya Pradesh.
      • Mahi and Sabarmati: Important rivers of Gujarat and Rajasthan.

Comparative Table: Himalayan vs. Peninsular Rivers

FeatureHimalayan RiversPeninsular Rivers
OriginGlaciers in the HimalayasPlateau regions
Nature of FlowPerennialSeasonal
Drainage PatternAntecedent and superimposedRadial, trellis, rectangular
Sediment LoadHigh (Alluvium)Low
Course LengthLonger courses with large basinsShorter courses with smaller basins

Major Rivers in India

  1. The Himalayan River Systems

    • Indus River System:
      • Origin: Mansarovar Lake, Tibet.
      • Total Length: 3,180 km (approx. 1,114 km in India).
      • Tributaries:
        • Left Bank: Jhelum, Chenab, Ravi, Beas, Sutlej.
        • Right Bank: Shyok, Gilgit.
      • Drainage Basin: Spans Jammu & Kashmir, Himachal Pradesh, Punjab, and parts of Haryana.
      • Economic Importance: Irrigation through the Indus Basin Irrigation System.
    • Ganga River System:
      • Origin: Gangotri Glacier (Bhagirathi), Uttarakhand.
      • Length: 2,525 km.
      • Tributaries:
        • Right Bank: Yamuna, Son.
        • Left Bank: Gomti, Ghaghara, Gandak, Kosi.
      • Drainage Basin: Covers Uttar Pradesh, Bihar, Jharkhand, and West Bengal.
      • Economic Importance: Fertile Gangetic Plains are crucial for agriculture.
    • Brahmaputra River System:
      • Origin: Angsi Glacier, Tibet (as Yarlung Tsangpo).
      • Length: 2,900 km (916 km in India).
      • Tributaries:
        • Left Bank: Dibang, Lohit, Dhansiri.
        • Right Bank: Subansiri, Manas, Sankosh.
      • Drainage Basin: Covers Arunachal Pradesh, Assam, and Bangladesh.
      • Features: Prone to massive flooding due to braided channels.

  2. The Peninsular River Systems

    • East-Flowing Rivers (Drain into Bay of Bengal):
      • Godavari River:
        • Longest peninsular river, called "Dakshin Ganga."
        • Originates in Maharashtra, flows through Telangana and Andhra Pradesh.
      • Krishna River:
        • Originates from Mahabaleshwar, Maharashtra.
        • Known for irrigation and hydroelectric projects.
      • Kaveri River:
        • Originates from Talakaveri, Karnataka.
        • Creates fertile deltas in Tamil Nadu.
      • Mahanadi River:
        • Originates in Chhattisgarh, flows through Odisha.
        • Features Hirakud Dam, the longest dam in the world.
    • West-Flowing Rivers (Drain into Arabian Sea):
      • Narmada River:
        • Originates from Amarkantak Plateau, Madhya Pradesh.
        • Flows through a rift valley.
      • Tapi River:
        • Originates in Madhya Pradesh and flows parallel to Narmada.
      • Mahi and Sabarmati Rivers:
        • Important rivers for Gujarat and Rajasthan.

Major Lakes in India

  1. Freshwater Lakes:

    • Wular Lake (Jammu & Kashmir):
      • Largest freshwater lake in India.
      • Origin: Tectonic activity.
    • Loktak Lake (Manipur):
      • Famous for floating islands (phumdis).
    • Dal Lake (Jammu & Kashmir):
      • Known for houseboats and tourism.

  2. Saltwater Lakes:

    • Sambhar Lake (Rajasthan):
      • Largest inland saltwater lake in India.
      • Economic Importance: Salt production.
    • Chilika Lake (Odisha):
      • Largest coastal saltwater lagoon in India.
      • Biodiversity hotspot and migratory bird habitat.
    • Pulicat Lake (Andhra Pradesh & Tamil Nadu):
      • Lagoon famous for flamingos.

  3. Artificial Lakes:

    • Govind Sagar Lake (Himachal Pradesh):
      • Reservoir of Bhakra Dam.
    • Rana Pratap Sagar Lake (Rajasthan):
      • Part of Chambal River Valley Project.

  4. Crater Lakes:

    • Lonar Lake (Maharashtra):
      • Formed due to meteorite impact.
      • Unique saline-alkaline ecosystem.

Comparison Table: Rivers and Lakes

FeatureRiversLakes
TypeFlowing water bodiesStatic water bodies
OriginGlaciers, rainfall, or springsTectonic, volcanic, man-made
Economic ImportanceIrrigation, hydropower, navigationTourism, biodiversity, salt production
Major ExamplesGanga, Brahmaputra, GodavariChilika, Wular, Sambhar

Major Waterfalls in India

  1. Jog Falls (Karnataka):

    • River: Sharavathi River.
    • Height: 253 meters (830 feet).
    • Type: Segmented waterfall.
    • Special Feature: One of the highest waterfalls in India, major tourist attraction.

  2. Dhuandhar Falls (Madhya Pradesh):

    • River: Narmada River.
    • Height: 30 meters (98 feet).
    • Type: Plunge waterfall.
    • Special Feature: Located in the Marble Rocks of Bhedaghat, Jabalpur.

  3. Dudhsagar Falls (Goa):

    • River: Mandovi River.
    • Height: 310 meters (1,020 feet).
    • Type: Tiered waterfall.
    • Special Feature: Known for its milky-white appearance.

  4. Athirappilly Falls (Kerala):

    • River: Chalakudy River.
    • Height: 80 meters (260 feet).
    • Type: Segmented waterfall.
    • Special Feature: Known as the "Niagara of India."

  5. Chitrakoot Falls (Chhattisgarh):

    • River: Indravati River.
    • Height: 30 meters (98 feet).
    • Type: Plunge waterfall.
    • Special Feature: Widest waterfall in India, also called the "Niagara of India."

  6. Hogenakkal Falls (Tamil Nadu):

    • River: Kaveri River.
    • Height: 20 meters (66 feet).
    • Type: Plunge waterfall.
    • Special Feature: Known for medicinal baths and coracle rides.

  7. Meenmutty Falls (Kerala):

    • River: Tributary of the Chaliyar River.
    • Height: 300 meters (984 feet).
    • Type: Tiered waterfall.
    • Special Feature: Three-tiered waterfall surrounded by dense forests.

Drainage Patterns in India

  1. Dendritic Pattern:

    • Most common pattern, resembling tree branches.
    • Example: Rivers of the Northern Plains (Ganga, Yamuna).

  2. Radial Pattern:

    • Rivers radiate outward from a central high point.
    • Example: Rivers originating from Amarkantak Plateau (Narmada, Tapi).

  3. Trellis Pattern:

    • Rivers flow through valleys created by folded mountains.
    • Example: Rivers in the Chotanagpur Plateau region.

  4. Rectangular Pattern:

    • Rivers flow along fault lines, forming a grid-like pattern.
    • Example: Streams in the Vindhyan region.

Importance of the Drainage System

  1. Agriculture:

    • Rivers like Ganga and Godavari provide irrigation to fertile plains.
    • Deltas are highly productive regions for rice cultivation.

  2. Hydropower:

    • Major dams like Bhakra Nangal, Hirakud, and Sardar Sarovar utilize river water for electricity generation.

  3. Navigation:

    • Rivers like Ganga and Brahmaputra are crucial for inland navigation.

  4. Biodiversity:

    • Lakes like Loktak and Chilika support unique ecosystems and migratory birds.

  5. Tourism:

    • Waterfalls like Jog Falls, Dudhsagar, and Athirappilly attract visitors.

  6. Flood Control:

    • Proper management of rivers helps in mitigating flood risks, especially in flood-prone regions like Assam and Bihar.

Key Data

FeatureExampleRemark
Longest River in IndiaGanga (2,525 km)Covers major states in North India
Largest Lake in IndiaVembanad Lake (Kerala)Brackish water lagoon
Highest Waterfall in IndiaKunchikal Falls (Karnataka)Height: 455 meters
Widest Waterfall in IndiaChitrakoot Falls (Chhattisgarh)Known as "Niagara of India"
Largest Delta in the WorldSundarbans DeltaFormed by Ganga-Brahmaputra-Meghna

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