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Waste Water Engineering

Waste Water Engineering
If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is

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

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Waste Water Engineering
The most efficient cross-section of sewers in a combined sewerage system is

New egged
Parabolic
Circular
Rectangular

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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

4 hours
6 hours
8 hours
2 hours

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Waste Water Engineering
The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

313.5 cm/sec
500 cm/sec
213.5 cm/sec
413.5 cm/sec

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

Kuichling
All of these
Fruhling
Lloyd David

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Waste Water Engineering
You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at

Half full
Two third full
Full depth
Three fourth full

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