Drainage System
CBSE · Class 11 · Geography
Quick revision notes for Drainage System — CBSE Class 11 Geography. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Basic Concepts and Terminology
- Drainage: Flow of water through well-defined channels
- Drainage System: Network of channels that drain water from an area
- Catchment Area: Specific area from which a river collects water
Drainage Patterns
- Dendritic Pattern: Tree-like branching pattern (e.g., Northern Plains rivers)
- Radial Pattern: Rivers flow in all directions from a central point (e.g., Amarkantak range)
- Trellis Pattern: Primary tributaries parallel, secondary at right angles
Classification of Indian Drainage
- Based on discharge orientation: Arabian Sea (23%) and Bay of Bengal (77%) drainage
- Major river basins: >20,000 sq km catchment (14 basins)
- Medium river basins: 2,000-20,000 sq km catchment (44 basins)
Himalayan Drainage System
- Evolved through long geological history
- Fed by both snowmelt and precipitation - hence perennial
- Main systems: Indus, Ganga, and Brahmaputra
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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