Using MathCAD and EXCEL solve Prob. $2\mathrm{.}7($Ans: $4\mathrm{.}23hr$;$4\mathrm{.}73hr$;$7\mathrm{.}8hr$;$416cfs).$

$2\mathrm{.}7$ A watershed has the following characteristics:

$A=2600ac$

$L=4mi.$

$S=53f\frac{t}{m}i.$

$y=1\%$

The channel is lined with concrete.

The watershed is a residential area with $\frac{1}{4}-$ac lots. The soil is categorized as soil

group B$.$ Assume that the average watershed slope is the same as the channel slope.

Determine the UH for this area for a storm duration of $1hr$ using the SCS triangular

UH method.