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
Answer: Option A
This Question Belongs to Civil Engineering >> Waste Water Engineering
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Dia of sewer ------- Gradient ------ Velocity.
100 ------- 1 in 60 ------- 0.58 m/s.
150 ------- 1 in 100 ------- 0.61 m/s.
225 ------- 1 in 120 ------- 0.79 m/s.