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

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

(a) 100 mm

(b) 150 mm

(c) 210 mm

(d) 400 mm

The question was posed to me during an internship interview.

This intriguing question originated from Analysis of Rates for Sanitary and Water Supply in section Analysis of Rates of Civil Engineering Drawing

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The correct option is (b) 150 mm

Easy 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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