Problem $2$

Design a rectangular primary sedimentation tank for a community having a population of $46900$

persons with an average water consumption of $200$ lpcd $.$ Use SOR$=20\frac{m}{d},L$:$W=3$:$1,$

detention time $=3$ hour, Weir loading rate $=250\frac{m^3}{m}$ day. Take at least two units.