Example $5$: Fill in the blank. The $1-$hr unit hydrograph $($UH$)$ is given below. $1-$hr UH means $1$ inch of rainfall in $1$ hour produced the runoff hydrograph.

The peak flow $($cfs$)$ for a $2$ in rainfall for the same duration of rainfall event is

$\backslash$table$[[$Time $($hours$),0,1,2,3,4,5,6,7,8,9,10],[$UH $($cfs$/$in$.),0,1,4,20,106,30,14,4,2,1,0]]$