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WASTE WATER ENGINEERING

Waste Water Engineering
When drainage to sewage ratio is 20, the peak dry weather flow is

Slightly more than 5% of the design discharge
None of these
Slightly less than 5% of the design discharge
20% of the design discharge

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Waste Water Engineering
The sewerage system consists of

House sewer
All of these
Lateral sewer
Branch sewer

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Waste Water Engineering
If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by

Kutter
Chezy
Bazin
Manning

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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

0.20 cumec
0.10 cumec
0.12 cumec
0.15 cumec

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

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

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