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The usual spacing between pools, areas of deeper water, and riffles, areas of shallower water, is usually very regular, being 5-6 times that of the bed width. The pool is an area of greater erosion where the availiable energy in the river builds up due to a reduction in friction. Energy is dissipated across the riffle area. As a higher proportion of the total energy is then needed to overcome friction, the erosive capacity is decreased and, except at times of high discharge, material is deposited.

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