The city of Norman is installing a new storm sewer
system near the junction of Lindsey and Elm streets to avoid future flooding.
The sewer system is designed to discharge a capacity of 7.5 ft3/s
when the pipe flows at 80% full, as shown in the figure. The slope
of the sewer is 0.003.
Determine the required pipe size.
Assume the flow is uniform.
The Manning coefficient for concrete pipe is n = 0.015.
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