Practice

A commercial parking catchment of $A=12\,\text{acres}$ has a runoff coefficient $C=0.65$ and a time of concentration $T_c=18\,\text{min}$. The local 10-yr IDF curve is fitted as $i=a/(t_d+b)^c$ with $a=64.1$, $b=11$, $c=0.81$ ($t_d$ in minutes, $i$ in in/hr). The 10-yr peak discharge from the catchment (cfs) is most nearly:

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