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Waste Water Engineering

Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

10% more
10% less
20% more
20% less

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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

William-Hazen
Kutter
Bazin
Crimp and Bruges

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Two sewer lines intersect
Ordinary manhole cannot be built
Invert level of a branch sewer is more than 60 cm that of the main sewer
Sewer line runs along a main road

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Waste Water Engineering
For design of sewers, percentage of sewage discharge is assumed

0.85
65 to 70%
70 to 75%
75 to 80%

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

413.5 cm/sec
213.5 cm/sec
313.5 cm/sec
500 cm/sec

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

150 ppm
200 ppm
100 ppm
50 ppm

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