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As a particle size gets larger in a stream, the force needed to move the particle in the suspended water column is greater. The velocity dictates which size particles are able to be picked up from the bed and carried as stream load. Some particles, such as fine silts, require very little velocity and can be dissolved on their own without moving water. Larger, coarse rock particles may require extremely high velocities which may only be reached during storm events, depending on the stream of course.

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Q: Why is stream velocity important to the carrying power of a stream?
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