Rivers and Drainage Systems of India
Overview
India's river system is one of the most extensive in the world, divided into Himalayan and Peninsular rivers. Himalayan rivers are perennial, fed by glaciers and monsoon rains, while Peninsular rivers are seasonal and rain-fed. Rivers are classified by drainage patterns, watershed areas, and flow direction. Understanding river origins, tributaries, and drainage basins is critical for UPSC and BPSC examinations, as questions frequently appear on river disputes, dams, and geographical features.
Typed Notes
Himalayan River Systems
The three major Himalayan river systems are the Indus, the Ganga, and the Brahmaputra. The Indus originates near Lake Mansarovar in Tibet and flows through Ladakh before entering Pakistan. The Ganga originates at Gangotri glacier (Bhagirathi) and is joined by the Yamuna at Prayagraj (Triveni Sangam). The Brahmaputra originates as the Tsangpo in Tibet, enters India through Arunachal Pradesh, and is known as Jamuna in Bangladesh. These rivers are perennial because they receive both glacial meltwater and monsoon rainfall throughout the year.
Peninsular River Systems
Peninsular rivers originate in the Western Ghats or the Vindhya-Satpura ranges. The Godavari, called 'Dakshin Ganga' (Ganges of the South), is the longest Peninsular river originating at Trimbakeshwar, Nashik. The Krishna originates at Mahabaleshwar and drains into the Bay of Bengal. The Kaveri originates at Talakaveri, Coorg (Karnataka) and is called 'Dakshin Ganga' of South India. The Mahanadi originates in Chhattisgarh. Narmada and Tapi flow westward through rift valleys, draining into the Arabian Sea, making them unique among Peninsular rivers.
Drainage Patterns and River Disputes
India's drainage patterns include dendritic (Ganga plains), trellis (Himalayan rivers), radial (Amarkantak plateau — origin of Narmada, Son, Mahanadi), and centripetal (inland drainage of Rajasthan). Inter-state river water disputes are adjudicated under the Inter-State Water Disputes Act, 1956. Key tribunals include: Cauvery Water Disputes Tribunal (Karnataka, Tamil Nadu, Kerala, Puducherry), Krishna Water Disputes Tribunal, and Narmada Water Disputes Tribunal. The Indus Waters Treaty (1960) between India and Pakistan, brokered by the World Bank, allocates the three eastern rivers (Ravi, Beas, Sutlej) to India and three western rivers (Indus, Jhelum, Chenab) to Pakistan.
Important Dams, Tributaries and Exam Facts
The Ganga's major right-bank tributaries are Yamuna, Son, Chambal, Betwa, and Ken; left-bank tributaries include Gomti, Ghaghra, Gandak, and Kosi (called 'Sorrow of Bihar'). The Damodar River was once called 'Sorrow of Bengal.' Bhakra-Nangal Dam is on the Sutlej River (Himachal Pradesh-Punjab border) — India's highest gravity dam. Tehri Dam on the Bhagirathi is India's tallest dam. Sardar Sarovar Dam is on the Narmada. The Brahmaputra forms the world's largest river island, Majuli, in Assam. The Luni River drains into the Rann of Kutch and is saline in its lower course.
Key Concepts
Revision ke liye ek nazar — exam se pehle yahi padhna hai.
- 01India has 12 major river systems; the Ganga basin is the largest, covering about 26% of India's total land area.
- 02Himalayan rivers (Indus, Ganga, Brahmaputra) are antecedent rivers — older than the Himalayas themselves, formed before mountain uplift.
- 03Peninsular rivers (Godavari, Krishna, Kaveri, Mahanadi, Narmada, Tapi) are consequent rivers flowing on slopes created by tectonic activity.
- 04Narmada and Tapi are the only major Peninsular rivers flowing westward into the Arabian Sea through rift valleys (grabens).
- 05The Western Ghats act as the main water divide for Peninsular rivers; rivers east of it drain into the Bay of Bengal.
Questions & Solutions
Pehle khud try karo — phir solution kholo. Yahi tariqa topper banata hai.
Why are Himalayan rivers called 'antecedent rivers'? Explain with an example.
Why do Narmada and Tapi flow westward unlike most other Peninsular rivers?
What is the significance of the Indus Waters Treaty, 1960? Name the rivers allocated to India.
Which rivers are called 'Sorrows' and why? Name at least two.
Name the origin points of the Godavari, Krishna, and Kaveri rivers. Why is Godavari called 'Dakshin Ganga'?
India's rivers are classified as Himalayan (perennial, antecedent) and Peninsular (seasonal, consequent). The Ganga system is the largest drainage basin. Narmada and Tapi uniquely flow westward through rift valleys. Key facts include river origins, major tributaries, important dams, drainage patterns, and inter-state water disputes. The Indus Waters Treaty (1960) governs India-Pakistan river sharing. These topics are repeatedly tested in UPSC Prelims, Mains, and BPSC examinations.
Chapter-end quiz
4 MCQsOption tap karo — turant pata chalega sahi ya galat, explanation ke saath.
Q1.Which is the largest river basin in India?
Q2.The Brahmaputra River is known by which name in Tibet?
Q3.Under which Act are inter-state river water disputes resolved in India?
Q4.Which river forms the world's largest river island, Majuli?
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