9. The average flow rate of a wastewater treatment plant is 20 MGD and the peak factor is 2.0.Design the sedimentation tanks (dimensions and weir length) by using the following

information: Hydraulic retention time = 90 minutes (based on peak flow) Hydraulic loading rate = 800 gpd/ft² (based on peak flow) Weir loading rate = 18,000 gpd/ft Number of tanks = 10 (in parallel) Length : width=7:1