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Waste Water Engineering

Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Recovery
Cleaner water
Degradation
Active decomposition

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Waste Water Engineering
The algae dies out in the zone of

Recovery
Degradation
Cleaner water
Active decomposition

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Waste Water Engineering
The minimum diameter of a sewer is kept

25 cm
10 cm
20 cm
15 cm

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Waste Water Engineering
In sewers the velocity of flow should not be

Less than 10 m/sec
More than the self-cleansing velocity
More than 20 m/sec
Less than the self-cleansing velocity

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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

Crimp and Bruges
William-Hazen
Kutter
Bazin

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Waste Water Engineering
Lead caulked joints are used for laying

Earthenware pipes
G.I. pipes
Stone ware pipes
I. pipes

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