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Waste Water Engineering

Waste Water Engineering
In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is

D/1
D/4
D/2
D/3

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Waste Water Engineering
The maximum depth of sedimentation tanks, is kept

3.5 m
4.5 m
3 m
4 m

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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
1500 litres/km/cm
500 litres/km/cm

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Waste Water Engineering
The detention period for plain sedimentation water tanks, is usually

4 to 8 hours
24 to 36 hours
16 to 24 hours
8 to 16 hours

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Waste Water Engineering
The water carried sewerage system removes

Domestic sewage
Storm sewage
All listed here
Industrial sewage

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Waste Water Engineering
The minimum diameter of a sewer is kept

15 cm
10 cm
25 cm
20 cm

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