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Waste Water Engineering

Waste Water Engineering
hydraulically equivalent, the relationship which holds good, is

D2/3 = 4 b2/3
D3/2 = 4 b3/2
D8/3 = 4 b8/3
D3/8 = 4 b3/8

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Waste Water Engineering
Setting out the alignments of sewers may start from

Tail end
Out-fall
Any point
City

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Waste Water Engineering
In sewage, the solids in mg per litre is

500 to 1000
100 to 500
1000 to 1500
1500 to 2000

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Waste Water Engineering
With self cleansing velocity in sewers

Both silting and scouring occur at bottom
Neither silting nor scouring occurs at bottom
Scouring occurs at bottom
Silting occurs at bottom

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Waste Water Engineering
The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

1.085
1.065
1.075
1.095

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Waste Water Engineering
For design purposes, the normal rate of infiltration of ground water into the sewer, is

1500 litres/km/cm
1000 litres/km/cm
500 litres/km/cm
2000 litres/km/cm

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