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The diameter of a domestic sewer pipe laid at gradient 1 in 100 is recommended ________

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The diameter of a domestic sewer pipe laid at gradient 1 in 100 is recommended ________

(a) 100 mm

(b) 150 mm

(c) 210 mm

(d) 400 mm

I have been asked this question by my school teacher while I was bunking the class.

Question is from Sanitary Works in section Road Estimating, Sanitary and Water Supply Work of Civil Engineering Drawing

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The correct option is (b) 150 mm

Easiest explanation: A sanitary sewer or “foul sewer” is an underground carriage system specifically for transporting sewage from houses and commercial buildings through pipes to treatment facilities or disposal. Sanitary sewers are part of an overall system called a sewage system or sewerage.

Sewage may be treated to control water pollution before discharge to surface waters. Sanitary sewers serving industrial areas also carry industrial wastewater.

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