2.1 Drainage Patterns

• Dendritic Patterns
• Radial Pattern
• Trellis Pattern

2.1.1 Dendritic Pattern   [fig 2.1(a)]
The tributaries flow into the main river at acute angles. The common drainage pattern resembles the branches of a tree. The word "dendritic" comes from the Greek word "dendron", which means "tree". This drainage pattern usually develops in an area of homogeneous rocks.

2.1.2 Radial Pattern   [fig 2.1(b)]
The rivers flow down in all directions from a central high point such as a volcanic cone. This pattern resemvles the spokes of a bicycle wheel.

2.1.3 Trellis Pattern   [fig 2.1(c)]
This pattern develops in an area where alternate bands ofresistant and less resistant rocks lie at right angles to the main river valley. The tributaries, which flow from ridges of resistant rocksand along the less resistant rocks, join the river at right angles.

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