$(2$ Pts$.)$ The total hydrograph shown below was produced by a rainfall event of $1\mathrm{.}75i\frac{n}{h}r$ over a duration of $2hrs.$ Assuming a constant infiltration loss of $0\mathrm{.}28i\frac{n}{h}r$ for the watershed and a constant baseflow of $60cfs$ in the stream. Determine the:

$($a$)2-$hr unit hydrograph and

$($b$)$ size $($acres$)$ of the watershed.

Also, report the time to peak, lag time and base time for the hydrograph.

Plot the DRO hydrograph and $2-$hr UH all on one graph.

Total Hydrograph:

$\backslash$table$[[t,($hrs$),0,1,2,3,4,5,6,7,8,9,10],[Q,(cfs),60,150,360,800,610,390,240,140,90,60,60]]$