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Waste Water Engineering

Waste Water Engineering
In sewers the effect of scouring is more on

Horizontal side
Bottom side
Top side
All sides

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Waste Water Engineering
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

Bazin
Crimp and Bruges
William-Hazen
Kutter

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Waste Water Engineering
If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

D’ = 0.84 D
D’ = 0.74 D
D’ = 0.64 D
D’ = 0.94 D

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Waste Water Engineering
For large sewers, maximum distance between manholes may be

50 m
200 m
300 m
100 m

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Waste Water Engineering
A manhole is generally provided at each

Junction
Change of gradient
All of these
Bend

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Waste Water Engineering
The temperature affects the

All of these
Solubility of gases in sewage
Viscosity of sewage
Biological activity of bacteria in sewage

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