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Waste Water Engineering

Waste Water Engineering
The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

1 in 10
1 in 15
1 in 5
1 in 20

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

All listed here
Low estimates of the average and maximum flows
Unexpected increase in population
Large scale infiltration of storm water

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Waste Water Engineering
In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept

0.25
10
2
5

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Waste Water Engineering
Rate of flow of sewage is generally assumed

Equal to the rate of water supply
Less than the rate of water supply
At 150 litres per capita
More than the rate of water supply

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Waste Water Engineering
In normal conditions, the period for sludge digestion, is

20 days
60 days
10 days
30 days

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Waste Water Engineering
In sewers designed with self cleansing velocity,

The bottom is silted
Both silting and scouring occur at the bottom
Neither silting nor scouring occurs at the bottom
The bottom is scoured

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