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Waste Water Engineering

Waste Water Engineering
Inter-distance between ventilation columns in a sewer line is kept

50 m to 100 m
25 to 50 m
100 m to 150 m
150 m to 300 m

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

All of these
Lloyd David
Kuichling
Fruhling

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Waste Water Engineering
Discrete or granular particles change their

Shape
None of these
Weight
Size

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Waste Water Engineering
For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is

Cement concrete sewers
Cast iron sewers
Glazed bricks sewers
Stone ware sewers

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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

0.10 cumec
0.15 cumec
0.12 cumec
0.20 cumec

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Waste Water Engineering
The normal value of over flow rates for plain primary sedimentation tanks, ranges between

50,000 to 60,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
40,000 to 50,000 litres/sqm/day
80,000 to 100,000 litres/sqm/day

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