3. (20 points) Results from laboratory settling tests on a flocculated water are summarized by the graph of isoremoval curves below. Determine the design detention time (in min) and the design overflow rate (in both gal/h ft and m/dm) for 60% suspended solids removal. 0 1.0 70% 2.0 60% Depth, ft 3.0 4.0 50% 20% | 30% 40% 5.0 0 40 50 10 20 30 Time, min