Water is flowing in a rectangular channel $2\mathrm{.}0$

$m$ wide. At a transition section the channel

bottom is lowered by $h=0\mathrm{.}1m$ for a short

distance, and then is raised back to the original

elevation. If $y=1\mathrm{.}22m$ and $Q=4\mathrm{.}8m\frac{3}{s},$ then,

with losses neglected, find the change in

channel width necessary to maintain a

horizontal water surface through the transition.

a$)0\mathrm{.}93m$

b$)2\mathrm{.}03m$

c$)1\mathrm{.}84m$

d$)0\mathrm{.}88m$

e$)1\mathrm{.}52m$