Applied Hydraulics #$4\mathrm{.}1\mathrm{.}9.$

Water flows from tank $A$ to tank $B($Figure $P4\mathrm{.}1\mathrm{.}9).$ The water surface elevation difference is $60ft.$ The water temperature is $68F,$ the pipe material is cast iron, and the pipeline $($square$-$edged entrance$)$ has the following characteristics in the table below. Determine the system's existing flow rate. What percentage increase in the flow would occur if the $8-$in$.$ line were completely replaced with the$16-$in$.$ pipeline?