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When it rains, soil and debris from the surrounding land are eroded and washed into streams. From there, sediment particles from as small as clay to as large as boulders flow along with the water. Fast-moving water can pick up, suspend, and move larger particles more easily than slow-moving waters. This is why rivers are more muddy-looking during storms -- they are carrying a LOT more sediment than they carry during a low-flow period. In fact, so much sediment is carried during storms that well over one-half of all the sediment moved during a year might be transported during a single storm period. When the river floods it spreads out over the land and its motion slows down. This causes it to drop its sediments on the existing land and they are left behind when the floods recede.

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