Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

All listed here
Large scale infiltration of storm water
Low estimates of the average and maximum flows
Unexpected increase in population

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

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

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