You are reviewing the design for a set of four rapid mix basins operating in parallel (i.e., of discharge through each basin) will treat a total of 20,000 m3/d. The water has a viscosity of 1.210-3 kg/(m*s). A. For a desired contact time of 20-s in the rapid mix basin, what is the volume required for each of the four basins? B. The current design calls for each basin to be mixed by a 10 hp motor (i.e., the power input to the motor is 10 hp). What will be the velocity gradient (G) in the basin? Report your answer in units of s-1. C. Typical design parameters for a basin would specify two conditions are met: 600 < G < 1000 5*104 < G < 5*105 Does the proposed design meet these criteria? D. Based on your responses above, would you recommend a larger or smaller motor, and why? What would change, if anything, if you take efficiency into account