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The hydraulic mean depth of a circular section running full is __________

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The hydraulic mean depth of a circular section running full is __________

(a) `D

(b) D/2

(c) D^2

(d) D/4

I had been asked this question during an interview for a job.

This interesting question is from Hydraulic Elements of Circular Sewers in section Hydraulic Design of Sewers of Environmental Engineering

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Correct choice is (d) D/4

For explanation I would say: The hydraulic mean depth, R = Area of cross section / Wetted perimeter

                                  = ((22/7) *D^2/4) / (22/7) *D

                                  = D/4.

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