A chemically enhanced primary treatment $($CEPT$)$ study was conducted on a coagulated industrial wastewater sample. The objective was to design a basin to remove $80\%$ TSS at a side water depth of $3\mathrm{.}5$ m$.$ A batch column test was performed in a $4-$m$-$tall and $15-$cm$-$diameter column. The initial concentration of TSS in the coagulated sample was $200$ mg$/$L$.$ The sampling ports were $0\mathrm{.}5$ m apart, the lowest port being $3\mathrm{.}5$ m below the water surface to simulate the design side water depth of the basin. The samples were withdrawn from each port at $10-$min interval. TSS was determined in each sample and the data matrix is given in Table $9\mathrm{.}1.$ Provide the following information $($a$)$ write the step$-$by$-$step experimental procedure and $($b$)$ determine the design values of detention time and overflow rate for $80\%$ removal.