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Waste Water Engineering

Waste Water Engineering
In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is

15
20
5
10

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Waste Water Engineering
Setting out the alignments of sewers may start from

City
Out-fall
Any point
Tail end

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Waste Water Engineering
The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

d (0.285d + 0.011H)/Q
d² (0.011d + 0.785H)/Q
d (0.785d + 0.011H)/Q
d (0.022d + 0.085H)/Q

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Waste Water Engineering
A manhole is classified as shallow if its depth is between

0.9 to 1.20 m
0.5 to 0.7 m
0.4 to 0.5 m
0.7 to 0.9 m

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Waste Water Engineering
depends upon The Chezy’s constant C in the formula V = C

Shape of the sewer
Size of the sewer
Roughness of sewer surface
All listed here

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Waste Water Engineering
Depletion of ozone layer in the outer atmosphere may cause

Lung cancer
Skin cancer
Heart disorder
Bronchitis

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