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The diameter of the sewer is _____ the diameter of ventilating column.

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in Environmental Engineering by (81.4k points)
The diameter of the sewer is _____  the diameter of ventilating column.

(a) Equal to

(b) 2 times

(c) 3 times

(d) 4 times

I had been asked this question in an online interview.

The origin of the question is Joints and Shapes of Sewers and  Cleaning, Maintenance and Ventilation of Sewer topic in division Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering

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Correct answer is (c) 3 times

The best I can explain: The diameter of ventilating column is one third of the diameter of the sewer. They can be provided when there is a change in size of sewer.

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