n$25$

Recall the development plans previously described:

$346-$acre plot of forested area

Recreation space: $29\%$ of the area

Residential space: $46\%$

Concrete streets: $12\%$

Time of concentration for the drainage area $=3\mathrm{.}5$ hours

Designed for a storm of $100-$yr frequency.

Based on these development plans, determine a suitable cross$-$section for a channel to carry the estimated runoff determined in Part A if the slope of the channel is $1\%$ and Manning's coefficient of roughness is $0\mathrm{.}016.$ Assume a $6-$foot width. What is the required depth of the drain?

Answer: $$ ftsubm