$1.$ Determine the peak runoff from a $4\mathrm{.}04$ in rainfall on a watershed that is $35\%$ bare soil $($HSG of D$),$ has $30\%$ of its soil in HSG B under grass, and $35\%$ in HSG C under forest. You will need to use Supplemental Information $(5-$Supplement$-$Curve$-$Numbers$)$ to determine the peak runoff. Provide a risk$-$based discussion of different possible peak runoff values and offer your recommendation as to which estimate should be used $(25$ Points$).$

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Mean $=2\mathrm{.}112$ Standard Deviation $=0\mathrm{.}105$ Skew coefficient $=0\mathrm{.}9$

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Estimate the probability that a discharge of $600$ ft$3/$s at this location will be equaled or exceeded at least once in the next $25$ years.