Which runoff pattern consists of parallel main streams with secondary streams joining at 90 degree angles?

The trellis runoff pattern is characterized by the presence of parallel main streams that run alongside each other, with secondary streams or tributaries entering at approximately right angles. This pattern often develops in regions with alternating bands of hard and soft rock, where the streams erode the softer material more quickly, creating a series of parallel main channels. The secondary streams typically flow into the parallel streams, resulting in the distinctive right-angle junctions that define the trellis pattern. This geometry allows for effective drainage and efficient water movement across the landscape, making trellis patterns commonly seen in certain geological formations and terrain types.

Other runoff patterns, such as dendritic and angular, exhibit different arrangements and structures that do not align with the characteristics of the trellis pattern. Dendritic patterns resemble tree branches and are typically more random in their configuration, while angular patterns exhibit a more pronounced angular directionality in the stream flows, lacking the parallel arrangement of mainstreams and right-angled tributaries found in trellis systems.