2. (20 points) A rapid-mixing basin for coagulation is to be designed for a water treatment plant. The design flow rate for the basin is 3800 m/d. The basin will be cylindrical with four vertical baffles and a side water depth equal to the diameter. The velocity gradient and detention time will be 1000 s' and 5 s, respectively. Assume the water temperature is 10C. (a) Calculate the basin dimensions in increments of 0.01 m. (b) A radial turbine impeller with a power number of 5.7 will be used to provide mixing, and the following impeller diameters are available (in m): 0.3, 0.4, 0.6. Determine the impeller diameter to be used, the required rotational speed of the impeller (rpm), and the motor power needed (in W) to turn the impeller