$$ A rectangular channel with B $=2\mathrm{.}5$ m carries water at Q $=6\mathrm{.}48$ m$3/$s$.$

$($a$)$ Find critical depth, $($b$)$ minimum specific energy, $($c$)$ plot E curve $($d$)$

alternate depths and corresponding Froude numbers when E $=1\mathrm{.}5$ m and

$($e$)$ plot q$-$curve when E $=1\mathrm{.}5$ m$.$