A circular storm water sewer 1.5 m in diameter and effective
roughness size 0.6 mm is
laid to a slope of 1:500. Determine the maximum discharge which the
sewer will convey
under uniform open channel conditions. If a steady inflow from
surface runoff exceeds the
maximum open channel capacity by 20%, show that the sewer will
become pressurised
(surcharged) and calculate the hydraulic gradient necessary to
convey the new flow.
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