Problem $23$: A twin $18-$inch concrete pipe culvert $(n=0\mathrm{.}012)$ conveying a discharge of $25$ cfs$.$

The culvert has a length of $50$ feet, slope of $0\mathrm{.}88$ percent, and square edge with headwall $(Ke=$

$0\mathrm{.}5).$ Tailwater depth is $3\mathrm{.}33$ feet. The headwater depth $(ft)$ is most nearly:

A$.3\mathrm{.}55$

B$.4\mathrm{.}60$

C$.6\mathrm{.}25$

D$.7\mathrm{.}95$