A trapezoidal channel has a bed width of 4.0 ft, a side slope of 2: 1, and a bed slope of 12 X  . The channel carries a discharge of90 /s and its Manning roughness coefficient is XXXXXXXXXXA dam is...

A trapezoidal channel has a bed width of 4.0 ft, a side slope of 2: 1, and a bed slope of 12 X
 . The channel carries a discharge of90
/s and its Manning roughness coefficient is 0.021. A dam is built across the channel where the heading up (afflux) is 2.22 ft. Determine the depth of flow 1500 ft upstream of the dam. What is the total length of the profile?