An impeller powered flocculation basin with no baffles is to be designed for a tertiary treatment plant having a flow of 30MGD. The plant is to employ alum coagulation, and data for the flocculation basin are as follows: - Detention time =30min - Grabient velocity, G=35 sec-1 - GI =10000 to 100000 . - Width =1.5 times depth - Length = two times width - Number of impellers =3 - Number of blades per impeller =6 - Impeller diameter =0.25 times basin width. Delermine (a) basin dimensions, (b) impeller diameter \& (c) power imparted to the fluid