Using a spreadsheet you develop, design a baffle wall for one of a pair of flocculation basins using the following design parameters: flow rate of $15,000$ m$3/$d$,$ diameter of orifices of $120$ mm $($maximum$),$ and orifice coefficient of discharge of $0\mathrm{.}60.$ Use velocities of $0\mathrm{.}55,0\mathrm{.}45,$ and $0\mathrm{.}35$ m$/$s to find the corresponding diameters in cm and headlosses for $60$ orifices.