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Four rectangular sedimentation basins with a depth of 4 m (with a freeboard of 0.5 m), a length of 10 m and a width of 3 m for each basin is proposed by a consultant for treating a raw river water as a pretreatment option with a flowrate ranging from 5,000 to 8,000 mp/d. The settling characteristics of particles in the influent are as follows: Settling velocity (m/h) 0-0.5 0.5-1.0 1.0-1.5 1.5-2.0 2.0-2.5 2.5-3.0 3.0-3.5 3.5-4.0 4.0-4.5 4.5-5.0 Total No. of particles (*10-6/L) 10 30 70 110 170 220 140 60 20 10 840 You are asked to assess whether such sedimentation basin could achieve 60% removal all year around and to suggest appropriate measure(s) for improvement if necessary. You may make appropriate assumption(s) where necessary