Student's Name: $q,$ ID: $q,$

Using an overflow rate of $31\mathrm{.}0m*$ day ${?}^{-1}$ and a detention time of $1\mathrm{.}8h,$ design for one primary sedimentation tank with length to width ratio of $5\mathrm{.}2$ for the average flow at Riyadh City of $0\mathrm{.}400m^3*s^{-1}$ distributed over $10$ sedimentation tanks$).$

Answer: