The hydrograph tabulated below is for a river that drains an area of $810m{i}^{{?}^{{?}^{?}}}2.$ Plot the hydrograph, separate the direct runoff from the base flow, and determine the volume of direct runoff in sfd$,$ acre$-$ft and in$.$ Over the basin. Use eq$.3-12$ to determine the duration of the runoff. Tabulate the direct runoff hydrograph at $12-$hr intervals.

$\backslash$table$[[$Day$,$Hour,$\backslash$table$[[$Discharge$],[($cfs$)]],$Day,Hour,$\backslash$table$[[$Discharge$],[($cfs$)]]],[0,0,850,4,0,3270],[,12,820,,12,2500],[1,0,790,5,0,1960],[,6,935,,12,1510],[,12,2620,6,0,1240],[,18,6350,,12,1020],[2,0,6970,7,0,850],[,6,6800,,12,680],[,12,6370,8,0,580],[3,0,5250,,,],[,12,4100,,,]]$