Type B streams are typically moderately entrenched and less steep than Type A streams – usually 2-4 percent. They can be thought of as “babbling brooks” that are found in narrow valleys of rolling hill landforms. The channel bed consists of a series of rapids and cascades with irregular scour pools – also known as “pools and riffles.” The bed and banks are relatively stable, and they are sediment-supply limited systems. If available, large woody debris is an important component of in-stream fish habitat in these systems. Many Type B streams are the result of the integrated influence of structural contact zones, faults, joints, colluvial-alluvial deposits, and structurally controlled valley side-slopes which tend to result in narrow valleys that limit the development of a wide floodplain.
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