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In page Sedimentation (water treatment):
"Although sedimentation might occur in tanks of other shapes, removal of accumulated solids is easiest with conveyor belts in rectangular tanks or with scrapers rotating around the central axis of circular tanks.[1] Settling basins and clarifiers should be designed based on the settling velocity (vs) of the smallest particle to be theoretically 100% removed. The overflow rate is defined as:[citation needed]
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