Drainage
Geography Chapter 3
Class 9
NCERT
, Geography ch 3
1. Drainage - River system of an area.
2. River System - A River along with its tributaries.
3. Drainage Basin - The area drained by a single river system
4. Water divide - Elevated area (mountain/ upland) that separates 2 drainage
basins.
5. 2 major groups of Indian rivers -
Himalayan Rivers Peninsular Rivers
i. Perennial - Flow year-round due i. Seasonal - Flow depends on
to rain and glacial melt. rainfall, reduced flow in dry
seasons.
ii. Origin - Lofty range of Himalayas.
ii. Origin - Peninsular Plateau
iii. Long courses from their source to
the sea. iii. Shorter and shallower courses.
iv. Perform intensive erosion in iv. Most originate in the Western
upper courses and carry huge Ghats and flow towards the Bay of
loads of sand and silt. Bengal.
v. Form meanders, oxbow lakes, and
well-developed deltas.
vi. Forms deep I shaped valleys -
Gorge
vii. Water available throughout the
year.
6. Courses of Rivers
Upper course Middle course Lower course
i. Origin of rivers i. Spread nature i. Deposition of rivers
ii. Intensive nature ii. Forms meander ii. Forms deltas and
and Ox-bow lakes Estuaries
iii. Forms Gorge
Geography ch 3 1
Geography Chapter 3
Class 9
NCERT
, Geography ch 3
1. Drainage - River system of an area.
2. River System - A River along with its tributaries.
3. Drainage Basin - The area drained by a single river system
4. Water divide - Elevated area (mountain/ upland) that separates 2 drainage
basins.
5. 2 major groups of Indian rivers -
Himalayan Rivers Peninsular Rivers
i. Perennial - Flow year-round due i. Seasonal - Flow depends on
to rain and glacial melt. rainfall, reduced flow in dry
seasons.
ii. Origin - Lofty range of Himalayas.
ii. Origin - Peninsular Plateau
iii. Long courses from their source to
the sea. iii. Shorter and shallower courses.
iv. Perform intensive erosion in iv. Most originate in the Western
upper courses and carry huge Ghats and flow towards the Bay of
loads of sand and silt. Bengal.
v. Form meanders, oxbow lakes, and
well-developed deltas.
vi. Forms deep I shaped valleys -
Gorge
vii. Water available throughout the
year.
6. Courses of Rivers
Upper course Middle course Lower course
i. Origin of rivers i. Spread nature i. Deposition of rivers
ii. Intensive nature ii. Forms meander ii. Forms deltas and
and Ox-bow lakes Estuaries
iii. Forms Gorge
Geography ch 3 1
