What is a dendritic drainage pattern and what conditions favor it?

What is a dendritic drainage pattern and what conditions favor it?

• A. A network of streams that crosses at right angles in fractured rocks
• B. A circular network around a central basin
• C. A dense braided network in steep, irregular terrain
• D. A tree-like network of streams that forms in uniform substrate with homogeneous permeability and gentle slopes

Answer: (D)

A dendritic drainage pattern is a tree-like network of streams that forms when the surface is largely uniform in material and permeability and the slopes are gentle. In such conditions there are no strong structural boundaries—like faults or distinct fracture sets—that would steer water along specific lines. Rainwater infiltrates and surface runoff distribute evenly across the landscape, so channels develop by branching in many directions. Tributaries join the main stem in a way that resembles branches, creating the characteristic dendritic look. This pattern contrasts with other drainage forms: a network that crosses at right angles tends to arise where joints and fractures in the rock set up a rectangular or fault-controlled grid; a circular or annular layout around a basin points to differential erosion or a central basin influence; a braided pattern occurs in steep terrain with high sediment load and variable discharge, where multiple small channels braid and rejoin.

A dendritic drainage pattern is a tree-like network of streams that forms when the surface is largely uniform in material and permeability and the slopes are gentle. In such conditions there are no strong structural boundaries—like faults or distinct fracture sets—that would steer water along specific lines. Rainwater infiltrates and surface runoff distribute evenly across the landscape, so channels develop by branching in many directions. Tributaries join the main stem in a way that resembles branches, creating the characteristic dendritic look.

This pattern contrasts with other drainage forms: a network that crosses at right angles tends to arise where joints and fractures in the rock set up a rectangular or fault-controlled grid; a circular or annular layout around a basin points to differential erosion or a central basin influence; a braided pattern occurs in steep terrain with high sediment load and variable discharge, where multiple small channels braid and rejoin.