A trapezoidal channel with a bed slope of 18 X and a side slope of 2 : 1 carries a discharge of 600 / s. The channel has a best hydraulic section and terminates into a free overfall. Determine the...

A trapezoidal channel with a bed slope of 18 X

and a side slope of 2 : 1 carries a discharge of 600
/ s. The channel has a best hydraulic section and terminates into a free overfall. Determine the water depth 2750 ft upstream of the fall using the step by step method. Take the Manning roughness coefficient as 0.025 and assume a critical depth at the fall.