Q$125)(5\backslash$times $2=10$ Marks$)$

$($i$)$ Define chezys constant and factors affecting it$.$

$($ii$)$ Find the discharge through a rectangular channel of width $2$ m$,$ having a bed slope of $4$ in $8000.$ The depth of flow is $1\mathrm{.}5$ m and take the value of N in Manning's formula as $0\mathrm{.}012.$