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Waste Water Engineering

Waste Water Engineering
The rational formula for peak drainage discharge, was evolved by

Kuichling
All of these
Lloyd David
Fruhling

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Waste Water Engineering
The digested sludge from septic tanks, is removed after a maximum period of

3.5 years
4 years
3 years
5 years

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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
0.20 cumec
0.15 cumec
0.10 cumec

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Waste Water Engineering
The minimum diameter of sewer to be adopted is

25 cm
15 cm
12.5 cm
10 cm

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

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

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Waste Water Engineering
If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

150 ppm
100 ppm
200 ppm
50 ppm

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