$100$ mm $($D$50)$ material is available to line a canal to carry $7$m$^3/$s of water a distance of $10$km$,$ along which there is an available drop of $60$m$.$ Determine the top width, wetted perimeter, area, and hydraulic radius of the channel.

Assume$\backslash$phi$=40$ degree,

$\backslash$tauco $=0\mathrm{.}03,$ and

n $=0\mathrm{.}038$Ks$1/6$ where Ks $=2($D$50)$

$=200$mm unit is meter in the metric form of of the mannings equation.

a$.$ First, solve assuming no drop structures are used,

b$.$ Then solve assuming five drop structures, each with a drop of $3$m$,$ are used.