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Waste Water Engineering

Waste Water Engineering
A manhole is classified as shallow if its depth is between

0.7 to 0.9 m
0.9 to 1.20 m
0.4 to 0.5 m
0.5 to 0.7 m

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

Egg shaped
Horse shoe shaped
Circular shaped
Parabolic shaped

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Waste Water Engineering
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

0.12 cumec
0.10 cumec
0.20 cumec
0.15 cumec

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

Circular
New egged
Rectangular
Parabolic

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Waste Water Engineering
The algae dies out in the zone of

Active decomposition
Recovery
Cleaner water
Degradation

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Waste Water Engineering
Sewer manholes are generally provided at

The change of gradient
The junctions of sewers
All of these
The change of direction

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