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Waste Water Engineering

Waste Water Engineering
The sewerage system consists of

House sewer
Lateral sewer
Branch sewer
All of these

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.20 cumec
0.15 cumec
0.12 cumec
0.10 cumec

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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

Kutter
Bazin
William-Hazen
Crimp and Bruges

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Waste Water Engineering
A well oxidized sewage contains nitrogen mainly as

Free ammonia
None of these
Nitrates
Nitrites

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Waste Water Engineering
The minimum recommended diameter of sewers, is

5 cm
15 cm
10 cm
20 cm

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Waste Water Engineering
The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is

1.5
3
2
4

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