Avertical turbine flocculator has been chosen for a new water treatment plant. the plant is in a dense urban area and space constraints mean that an area of 40 m2 per basin is available for three trains consisting of three stages. the basins should be cubical and of equal volume, and the following velocity gradients are needed for each stage: 45 s-1 in the first, 20 s-1 in the second, and 10 s-1 in the third. the design flow is 15000 m3/d (3.96 mgd) and the design temperature is 10c. a. draw a schematic of the flocculation system. b. what is the power in watts for each stage?