Problem#$3$:

A storm discharge system is shown here $($see Figure$).$ Flow direction is indicated on the figure and the watershed as well as pipe data are given in the following tables:

$\backslash$table$[[$Subarea$,\backslash$table$[[$Area$],[($Acres$)]],$Runoff Coef., C$,$tc $($min$)],[1,6\mathrm{.}35,0\mathrm{.}3,10],[2,12\mathrm{.}39,0\mathrm{.}4,18],[3,15\mathrm{.}26,0\mathrm{.}5,20],[4,6\mathrm{.}00,0\mathrm{.}6,9]]$

$\backslash$table$[[$Pipe$,\backslash$table$[[$Length$],[(ft)$