The effect of increasing diameter of sewer on the self cleansing velocity is
A. To decrease it
B. To increase it
C. Fluctuating
D. Nil
Answer: Option B
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The distribution mains are designed for
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C. Average daily demand
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Sewage treatment units are designed for
A. Maximum flow only
B. Minimum flow only
C. Average flow only
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Dia. Self cleansing velocity(m/s)
150-200mm. 1
200-600mm. 0.75
>600mm. 0.6
So A is correct ans.
Self cleaning velocity is inversely proportional to ta dia of sewer
So and A is correct
Option A is correct . with increase in dia self cleansing velocity decreases according to Badwin Latham
self cleansing velocity depends on dia of grain but not on the dia of sewer