A cross flow horizontal shaft, paddle wheel flocculation basin with a three chamber

flocculation basins is to be design for a flow of $11,318\frac{m^3}{d}$ and a detention time of $45$

minutes. Assume the flow will split into flocculation basins after the alum addition.

Determine:

a$)$ the number of basins needed for a design flow of $11,318m^{{?}^{?}}\frac{3}{d}$ with one standby.

b$)$ the number of basin$($s$)$ to be in operation during winter months $($at $7,568\frac{m^3}{d}),$

assume detention times from flocculation design criteria $(20-6-$ minutes$).$

c$)$ the detention time for the basin$($s$)$ that remain in operation during the summer months.