Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

Large scale infiltration of storm water
Unexpected increase in population
Low estimates of the average and maximum flows
All listed here

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Waste Water Engineering
Traps

Create symphonic action to increase the quick disposal of sewerage
Dissolve the foul gases
Are used to trap the rats entering sewers
Are water seals which prevent the entry of foul gases

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