A circular rapid mixing basin is being designed for sweep coagulation $($reguired G $=700$ s$^-1).$ The basin must treat $5$ MGD with a residence time of $5$ seconds.

a$)$Determine the required basin diameter if the height is $2$ meters.

b$)$If a $40-$cm diameter, radial vaned disc turbine with $6$ flat blades is available, what should be the operational speed in rpm$?$

c$)$To what depth should the impeller be placed?

d$)$Is the basin design suitable?