Question $4-5$

Homework $*$ Answered $*$ Due Oct $22$nd$,11$:$59$ PM

A trapezoidal channel has a bottom width of $B_0=5m,$ sidewall slope of $1V$:$1H,$ and bed slope of $S_0=0\mathrm{.}004.$ The channel bottom is

compact gravel with a mean diameter of $d_{50}=26mm$ and the sidewalls are concrete $(n=0\mathrm{.}013).$ Use Horton's equation to

calculate the equivalent Manning constant. The total discharge for a water depth of $1\mathrm{.}4$ m is:

Select an answer and submit. For keyboard navigation, use the up$/$down arrow keys to select an answer.

a $,Q=14\mathrm{.}5\frac{m^3}{s}$

b $,Q=18\frac{m^3}{s}$

$Q=22\mathrm{.}5\frac{m^3}{s}$

$Q=16\frac{m^3}{s}$

Can someone explain how this is $16?$ i get $14\mathrm{.}5$ as my answer.