A dendritic stream consists of the random merging of streams, with tributaries joining larger streams irregularly at acute angles generally developing in regions where the underlying structure does not significantly control the drainage.
Trellis stream drainage patterns develop on alternating bands of hard and soft strata, with long parallel subsequent streams linked by short, right-angled segments and joined by short tributaries.
Dendritic drainage: The steams display a pattern that resembles a branching tree. These were created in lithologically consistent regions, such as sedimentary, huge igneous, or metamorphic rock. It grows on strata that are either almost horizontal or very gently dipping. That surface has virtually little relief. In the Himalayan region, Deccan plateau, and glaciated lowland region, this type of drainage pattern is quite prevalent.
Short tributaries join the mainstream at practically a straight angle in a drainage system known as a trellis. It grows in an area above strata that are crumpled and inclined. The mainstream develops in the strike troughs cut into the soft rocks, in contrast to the dendritic pattern, while tributaries flow down resistive ridges.
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