If the channel of problem 5.1.10 is preceded by a steep slope and followed by a mild slope...

If the channel of problem 5.1.10 is preceded by a steep slope and followed by a mild slope and a sluice gate as shown in Figure P5.3.4, sketch a possible water surface profile with the elevations to a scale of 1 in to 10 ft. Consider a discharge of 1500 cfs. For this discharge, the normal depth for a slope of 0.0003 is 8.18 ft and for a slope of 0.0002 is 9.13 ft.

Figure P5.3.4

Problem 5.1.10

For a trapezoidal-shaped channel (n = 0.014 and slope So of 0.0002 with a 20-ft bottom width and side slopes of 1 vertical to 1.5 horizontal), determine the normal depth for a discharge of 1000 cfs.