Drainage System of India
India's rivers — the perennial Himalayan system and the seasonal Peninsular system, their major rivers, tributaries, and east- vs west-flowing patterns.
Key Takeaways
- Indian rivers are grouped into the Himalayan (perennial, snow-fed) and Peninsular (seasonal, rain-fed) systems.
- The Ganga is India's largest river system; the Godavari is the largest Peninsular river ('Dakshin Ganga').
- Most Peninsular rivers flow east into the Bay of Bengal; the Narmada and Tapi flow west into the Arabian Sea.
Core concept
A drainage system is the network of rivers and their tributaries draining a region. India's rivers fall into two great families with very different characters — the Himalayan rivers, fed by snow and rain, and the Peninsular rivers, fed only by rain.
Static foundation — the two systems
Himalayan vs Peninsular Rivers
| Feature | Himalayan Rivers | Peninsular Rivers |
|---|---|---|
| Water flow | Perennial (snow + rain) | Seasonal (rain-fed) |
| Age & course | Young; long, meandering; still eroding | Old; shorter, fixed courses; graded |
| Valleys | Deep gorges (antecedent drainage) | Shallow valleys |
| Examples | Indus, Ganga, Brahmaputra | Godavari, Krishna, Kaveri, Narmada, Tapi |
The Major River Systems
Rises in Tibet near Mansarovar; its five tributaries are the Jhelum, Chenab, Ravi, Beas and Sutlej (Punjab = 'land of five rivers'). Shared with Pakistan under the Indus Waters Treaty (1960).
Why the Narmada and Tapi form estuaries, not deltas
The Narmada and Tapi flow westward through rift valleys (faulted troughs between the Vindhya and Satpura ranges). The fast flow through hard rock and the narrow mouth prevent silt deposition, so they form estuaries rather than deltas — unlike the east-flowing rivers.
Relevance & current linkage
River issues dominate policy: the National River Linking Project, inter-state water disputes (Cauvery, Krishna), river pollution and rejuvenation (Namami Gange), and trans-boundary rivers with China and Pakistan. (Add a current river dispute or project update.)
Prelims trap zones
- Narmada and Tapi flow WEST and form estuaries; most other Peninsular rivers flow EAST and form deltas.
- Ganga = largest basin; Godavari = largest Peninsular river.
- Kosi = Sorrow of Bihar; Damodar = (former) Sorrow of Bengal.
Prelims Pointers
- The Ganga forms at Devprayag, where the Bhagirathi (from Gangotri) meets the Alaknanda.
- The Kosi is called the 'Sorrow of Bihar' for its floods; the Damodar was the 'Sorrow of Bengal'.
- The Narmada and Tapi flow through rift valleys and form estuaries, not deltas.
- The Indus Waters Treaty (1960) governs the sharing of the Indus system between India and Pakistan.
Mains Angle
- 'Himalayan rivers are perennial while Peninsular rivers are seasonal.' Explain why.
- Discuss the significance of interlinking of rivers and the associated concerns.
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