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Waste Water Engineering

Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

3
2
4
1.5

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

8 hours
6 hours
2 hours
4 hours

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Waste Water Engineering
Large diameter sewers subjected to external pressure alone, are reinforced

Near the outer surface of the pipe
Both A and B
With elliptical cage
Near the inner surface of the pipe

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Waste Water Engineering
In a fully mechanised composting plant, involves

All of these
Mechanized segregation
Mechanized receipt
Mechanized pulverising of refuse

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Waste Water Engineering
If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is

1.75 D
1.15 D
1.5 D
1.25 D

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

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

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