$8\mathrm{.}20.$ A small drainage area is shown schematically in Figure $8\mathrm{.}14.$ It is divided into three areas connected by a straight run of storm sewer. Drainage area characteristics are shown in Table $8\mathrm{.}24$ and the associated storm sewer flow times are shown in Table $8\mathrm{.}25.$ Use the Rational formula to compute peak flows to each inlet, and for pipes $1-2,2-3,$ and $3-4.$ Use the $10-$yr event and Figure $6\mathrm{.}5$ as the IDF curves representing the region.