Drainage System
Gujarat Board · Class 9 · Social Science
Quick revision notes for Drainage System — Gujarat Board Class 9 Social Science. Key concepts, formulas, and definitions for last-minute revision.
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Basic Concepts and Definitions
- Drainage system is the systematic pattern of rivers in any region
- River basin is the area drained by a river and its tributaries
- Water divide is a mountain or upland that separates water flow of different rivers
River Course Stages
- Rivers have three stages: Upper Course, Middle Course, and Lower Course
- Upper Course: Intense erosion, steep slopes, V-shaped valleys
- Middle Course: Reduced flow, meandering begins, lateral erosion
Drainage Patterns
- Four main drainage patterns: Dendritic, Trellis, Rectangular, and Radial
- Dendritic Pattern: Tree-like arrangement (e.g., Ganga system)
- Trellis Pattern: Net-like pattern from mountainous streams (Himalayan streams)
Himalayan Rivers
- Three major systems: Indus (Sindhu), Ganga, and Brahmaputra
- Perennial rivers with water throughout the year
- Fed by monsoon rains and melting snow/glaciers
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