What Is a Trellis Drainage Pattern?


Quick Answer

A trellis drainage pattern occurs when tributaries join a river and erode a valley at right angles in a pattern that resembles a garden trellis. Drainage patterns occur most often where rock or other soil formations can erode easily along weak areas in the rock.

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Full Answer

There are three other different types of drainage patterns caused by rainfall:

  • Dendritic: This is the most common type of drainage pattern where it develops on top of land where the rock is uniformly resistant to erosion.
  • Radial:Develops in high elevations that drop to lower areas.
  • Rectangular: Develop at linear zones of weakness including joints and faults.
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