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Waste Water Engineering

Waste Water Engineering
The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

Bazin
Kutter
William-Hazen
Crimp and Bruges

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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

2
10
0.25
5

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Waste Water Engineering
Drop manholes at the junctions of sewer lines, are provided if

Ordinary manhole cannot be built
Two sewer lines intersect
Sewer line runs along a main road
Invert level of a branch sewer is more than 60 cm that of the main sewer

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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
0.88 m
1.36 m
1.76 m

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Waste Water Engineering
House connections to the laterals is generally made by

P.C.C.
Glazed stonewares
R.C.C.
Cast iron

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Waste Water Engineering
If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

2 hours
4 hours
8 hours
6 hours

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