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Waste Water Engineering

Waste Water Engineering
The design period in years for pumping plants, is

3 to 5
1
5 to 10
2 to 3

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Waste Water Engineering
15 cumecs, the depth d and width are related by For drains up to

B = 0.5 d
B = 0.2 d
d = 0.2 B
d = 0.5 B

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Low estimates of the average and maximum flows
Large scale infiltration of storm water
All listed here
Unexpected increase in population

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Waste Water Engineering
To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is

0.70 m/sec
0.50 m/sec
0.60 m/sec
0.75 m/sec

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Waste Water Engineering
Removal of oil and grease from sewage, is known

Screening
Filtration
None of these
Skimming

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Waste Water Engineering
The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
Vs = 418 (Gs – Gw) d [(3T + 70)/100]
Vs = 218 (Gs – Gw)d [(3T + 70)/100]

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