$7\mathrm{.}5\mathrm{.}5$ The one$-$hour unit hydrograph for a watershed is given below. Determine the runoff from this watershed for the storm pattern given. The abstractions have a constant rate of $0\mathrm{.}3i\frac{n}{h}.$ What is the area of this watershed?

$\backslash$table$[[$Time $($h$),1,2,3,4,5,6],[$Precipitation $($in$),0\mathrm{.}5,1\mathrm{.}0,1\mathrm{.}5,0\mathrm{.}5,,],[$Unit hydrograph $($cfs$/$in$),10,100,200,150,100,50]]$

$7\mathrm{.}5\mathrm{.}6$ Use the same unit hydrograph as in Prob. $7\mathrm{.}5\mathrm{.}5$ and determine the direct runoff hydrograph for a two$-$hour storm with $1$ in of excess rainfall the first hour and $2$ in the second hour. What is the area of this watershed?