1)a rectangular clarifier with a length to width ratio of 3: 1 receives a flow of 850 m3/d. the clarifier’s depth is 4 m and the detention time of the water in the clarifier is2.4 hours. what are the surface overflow rate and horizontal flow through velocity if the flow is distributed uniformly across the cross section of the tank? 2)you are asked to aid in the design of a settling chamber that will be used to remove silica particles from an air stream (temperature = 25degrees c). if the particles have a diameter of 10 x10-6 m and a specific gravity of 2.6, calculate the settling velocity. if the chamber receives a flowrate10 m3/s design a (specify length width and height) chamber that will effectively remove these particles from the airstream.