Question $3$: Design of Rectangular Clarifier $(7$ marks$)$

Four rectangular clarifiers, each $60$ m long and $12$ m wide with a water depth of $3\mathrm{.}5$ m $,$ are used a total flow of $76,000\frac{m^3}{?}$ day after a flocculation process. The dose of coagulant was $50$ ppm $.$ Calculate the following:

$L=60m$

a$.$ Surface Overflow Rate $($SOR$)$ in $\frac{m^3}{m^2}\frac{?}{?}$ day.

b$.$ Detention Time $($DT$)$ in hours.

c$.$ Horizontal Velocity in $\frac{m}{m}in.$

$Q=76,000$

d$.$ Quantity of Coagulants for $6$ months in kg $.$