A rectangular channel with concrete $($n $=0\mathrm{.}014)$ has a bottom width of $1\mathrm{.}52$m$.$ and aslope of $2\mathrm{.}50\%.$ Water is flowing at a depth of $0\mathrm{.}38$m$.($a$)$ What is the discharge in m$3/$s$?($b$)$ What is the average velocity in m$/$s$?$