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What should be the diameter of the sewer when the self cleansing velocity is 60cm/Sec?

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+2 votes
in Environmental Engineering by (81.4k points)
What should be the diameter of the sewer when the self cleansing velocity is 60cm/Sec?

(a) 10cm

(b) 20cm

(c) >60cm

(d) 100cm

I have been asked this question in a national level competition.

Question is taken from Minimum and Maximum Velocity of Flow in portion Hydraulic Design of Sewers of Environmental Engineering

1 Answer

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Best answer
Right choice is (c) >60cm

The explanation is: The self cleansing velocity varies inversely with the diameter of the sewer and when the diameter is above 60, the self cleansing velocity is 60cm/Sec whereas, for 15cm diameter of the sewer, it is 100cm/Sec.

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