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Waste Water Engineering

Waste Water Engineering
The underground sewers are more subjected to

Bending force
Compressive force
Tensile force
Shearing force

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Waste Water Engineering
The spacing of bars of perforations of fine screens used for the treatment of sewage, is

5 to 8 mm
8 to 10 mm
3 to 5 mm
2 to 3 mm

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Waste Water Engineering
Large diameter sewers subjected to external pressure alone, are reinforced

With elliptical cage
Near the inner surface of the pipe
Both A and B
Near the outer surface of the pipe

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Waste Water Engineering
The asbestos cement pipes are generally laid

At an angle of 30°
At an angle of 60°
Vertically
Horizontally

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Waste Water Engineering
The maximum depth of sedimentation tanks, is kept

3 m
4.5 m
4 m
3.5 m

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

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

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