Question $22-$ FE Practice $(3$ points$)$

A $36-$in$-$diameter sewer is installed at a slope of $0\mathrm{.}006f\frac{t}{f}t.$ Assuming the roughness coefficient $n$ is constant with depth and equal to $0\mathrm{.}015,$ the velocity $(f\frac{t}{sec})$ of water in a half$-$full pipe is most nearly:

A$.4\mathrm{.}3$

B$.5\mathrm{.}8$

C$.6\mathrm{.}3$

D$.10\mathrm{.}1$