3. (8 points) A secondary clarifier at a WWTP operates with a flowrate of 2,000,000L/ day. The top area of the clarifier has a length of 18m and a width of 4m. For the questions that follow be sure to state all assumptions. (a) (3 points) Determine the velocity of the water that travels upward through the clarifier in units of cm/sec. (b) (5 points) Determine the minimum particle diameter that will settle out in the secondary clarifier if the particle density is 2g/cm3. 3. (8 points) A secondary clarifier at a WWTP operates with a flowrate of 2,000,000L/ day. The top area of the clarifier has a length of 18m and a width of 4m. For the questions that follow be sure to state all assumptions. (a) (3 points) Determine the velocity of the water that travels upward through the clarifier in units of cm/sec. (b) (5 points) Determine the minimum particle diameter that will settle out in the secondary clarifier if the particle density is 2g/cm3