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If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?

/ Civil Engineering Mcqs, Waste Water Engineering / By
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is__________________?

A. 1 in 60
B. 1 in 100
C. 1 in 120
D. None of these