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Waste Water Engineering

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

1.065
1.075
1.085
1.095

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Waste Water Engineering
With self cleansing velocity in sewers

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

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Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

1 in 100
1 in 60
None of these
1 in 120

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Waste Water Engineering
In olden days the type of section adopted in trunk and out fall sewers was

Egg shaped
Parabolic shaped
Circular shaped
Horse shoe shaped

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Waste Water Engineering
‘Cowl’ is provided at

Upper end of ventilating column
Lower end of ventilating column
First step in manhole
Upper end of the manhole

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Waste Water Engineering
The intensity of rain is expressed in

None of these
cm/minute
cm/day
cm/hour

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