Waste Water Engineering
For design purposes, the normal rate of infiltration of ground water into the sewer, is

1500 litres/km/cm
2000 litres/km/cm
500 litres/km/cm
1000 litres/km/cm

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

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

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