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