- The geometry of a trellis drainage system is similar to that of a common garden trellis used to grow vines.
- As the river flows along a strike valley, smaller tributaries feed into it from the steep slopes on the sides of mountains.
- These tributaries enter the main river at approximately 90 degree angle, causing a trellis-like appearance of the drainage system.
- This pattern is found usually in old degraded areas like Chota Nagpur plateau, Deccan plateau etc.
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