A trapezoidal channel with a bed width of 7.0 m and a side slope of 3:2 is laid on a slope of 0.001 and carries a discharge of 30.0  /s. The channel terminates to a freefall at which the depth is...

A trapezoidal channel with a bed width of 7.0 m and a side slope of 3:2 is laid on a slope of 0.001 and carries a discharge of 30.0
 /s. The channel terminates to a freefall at which the depth is reduced to the critical depth. If the Manning roughness coefficient is 0.02, compute and plot the flow profile upstream from the overfall to a section where the water depth is 0.9 times the normal depth. Use the step-by-step method.