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4. Civil engineers frequently encounter flow in pipes wherein the pipe is not full of water. This occurs in sewers, for example. Shown is a half-full sewer pipe made of

unfinished concrete, which is designed to carry water at 60 cfs i.e., ft/s. The downward slope of the pipe is 0.0015.(Hint: Lecture Determine the required internal radius of the pipe.

Fig: 1