$9\mathrm{.}15$ Design the outlet structure $($box inlet and pipe sizes$)$ for the reservoir in Problem $9\mathrm{.}14$ using the inflow hydrograph giving below. The runoff depth is $80\mathrm{.}8mm$ and the peak runoff rate is $6\mathrm{.}12\frac{m^3}{s}.$ The maximum allowable elevation of thr flood spillway crest is $30\mathrm{.}2m$

$\backslash$table$[[$Time $(min),Q(\frac{m^3}{s}),$Time $(min),Q(\frac{m^3}{s})$