A small channel has the following data:

Bed width $=1\mathrm{.}40$ m

Side slopes $=1$:$5$:$1$

Depth $=0\mathrm{.}85$m

Bed slope $=1$ in $900$

N $=0\mathrm{.}025$

Determine the discharge according to Manning's formula.

$*$ If the canal is lined with concrete $($N $=0\mathrm{.}014),$ determine the discharge.

$*$ Determine the section of the lined channel to carry the discharge obtained in $($a$).$ Take the same B$/$D ratio.