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The minimum diameter of the working chamber for a circular manhole is __________

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The minimum diameter of the working chamber for a circular manhole is __________

(a) 0.8m

(b) 0.9m

(c) 1m

(d) 1.2m

The question was posed to me in an interview.

This intriguing question originated from Devices Associated with Sewer in chapter Construction of Sewers, Sewer Appurtenances and Sewage Pumping of Environmental Engineering

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Best answer
The correct option is (d) 1.2m

The best I can explain: The working chamber is the lower portion of the manhole having a minimum diameter of 1.2 m.

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