Discussion
Stream competence primarily depends up :
Answer: D
Stream competence depends primarily on Flow velocity.
Competence is the size of the largest particle a stream can move. It rises very steeply with velocity: the maximum particle weight that can be moved is often stated to vary roughly with the sixth power of velocity, so a doubling of speed during a flood can move boulders that were immobile before.
The amount of suspended load relates to capacity (how much material is carried), not to the largest grain size. Water temperature and channel shape have only secondary effects, mainly through their influence on velocity and turbulence.
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