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As part of the Sedimentation Tank Hydraulics Team, I determined that the minimum angle of repose required for floc blanket formation to be about 25 degrees. The minimum angle of repose is the minimum angle of the sloping sides of the sedimentation tank that allow settling flocs to be returned to the jet. Angles smaller than the angle of repose resulted in sludge accumulation, while angles larger than the angle of repose would result in a taller and more expensive sedimentation tank, but also quicker floc return to the jet.