EARTH DRAINAGE PATTERN AND TYPES

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EARTH
DRAINAGE
PATTERN
AND TYPES
DRAINAGE PATTERNS
DRAINAGE
Drainage; The river system of an area
called Drainage,
River Basin; The rain catchment area of a
river called river basin, which may divided
into subbasin on the basis of river
tributaries or streams.
Watershed; The smallest unit of river basin
DRAINAGE PATTERNS
The streams within a drainage basin form
certain patterns, depending on:
 Local Topography; slope of land
 Geology; lithology, type of rocks
 Structure; fold, faults, Joints
 Climatic Conditions; rain, snow fall
 Vegetation; type of trees and forests

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TYPES OF DRAINAGE PATTERN
Dendritic Drainage Pattern
Trellis Drainage Pattern
Rectangular Drainage Pattern
Radial Drainage Pattern
Parallel Drainage Pattern
DENDRITIC DRAINAGE PATTERN
 Dendritic Pattern develops where the
river channel follows the slope of the
terrain.
 The stream with it’s tributaries resembles
the branches of a tree.
 Forms V-shaped valleys
 Rocks are impervious and nonporous
DENDRITIC DRAINAGE PATTERN TRELLIS DRAINAGE PATTERN
 A river joined by its tributaries, at
approximately right angles, develop a
Trellis pattern.
 Pattern develops where hard and soft
rocks exist parallel to each other.
 Trellis drainage is characteristic of folded
mountains.

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TRELLIS DRAINAGE PATTERN
RECTANGULAR DRAINAGE PATTERN
 Rectangular Drainage Pattern develop
in rocks uniformly resistance to
erosion.
 The rocks are strongly jointed,
normally having two set of joints at
right angles
RECTANGULAR DRAINAGE PATTERN
RADIAL DRAINAGE PATTERN
 Radial Drainage develops when stream
flow in different directions from a central
peak, volcano, or dome like structure.
 Streams radiate outward from a central
high point, the drainage may exhibit a
combination of radial and annular pattern

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RADIAL DRAINAGE PATTERN
ANNULAR DRAINAGE PATTERN
 Annular Drainage develop by streams
following a roughly circular or concentric
path making a ring like pattern.
 Pattern develop in structural domes or
basins where sedimentary rocks of varying
hardness are exposed to the surface.
ANNULAR DRAINAGE PATTERN
PARALLEL DRAINAGE PATTERN
 The Parallel Drainage Pattern develops
in an area of steep slopes
 Parallel and elongated land forms
outcropping resistant rock bands.
 The streams are swift, straight with few
tributaries.

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PARALLEL DRAINAGE PATTERN CENTRIPETAL DRAINAGE PATTERN
 Also called Inland Drainage Pattern
 Its opposite to Radial Pattern
 Streams emerge from surrounding upland
areas
 These flow down to converge in a central
low land, depression, basin or crater lake
CENTRIPETAL DRAINAGE PATTERN
DRAINAGE PATTERN
Some time a combination of many
Drainage Pattern may be found in a
same River Basin or Drainage System.

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