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Waste Water Engineering

Waste Water Engineering
The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is

0.68 m
1.36 m
0.88 m
1.76 m

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Waste Water Engineering
Large diameter sewers subjected to external pressure alone, are reinforced

Both A and B
Near the outer surface of the pipe
With elliptical cage
Near the inner surface of the pipe

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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
A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is

0.45 m/sec
0.35 m/sec
0.30 m/sec
0.40 m/sec

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Waste Water Engineering
Lead caulked joints are used for laying

I. pipes
G.I. pipes
Earthenware pipes
Stone ware pipes

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Waste Water Engineering
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

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

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