Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.74 D
D’ = 0.94 D
D’ = 0.64 D
D’ = 0.84 D

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Waste Water Engineering
For treating the sewage of a large city, you will recommend

None of these
A plant consisting of Imhoff tanks with low rate trickling filters
Sedimentation tanks with high rate trickling filters
A sedimentation tank and an activated sludge treatment plant

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