Eight hundred cubic feet per second flow in a rectangular channel of $20$ ft widthhaving n $=0\mathrm{.}017.$ Calculate $($a$)$ the critical depth $($b$)$ the minimum specific energy$($c$)$ the specific energy when the depth of flow is $7$ f$.$ What type of flow exists when the depth is $($d$)2$ ft and $($e$)6$ ft$?$ Plot the specific energy curve