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

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

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Waste Water Engineering
The sewers

Must be of adequate size to avoid over flow
Must flow under gravity ½ to ¾ full
All listed here
Must be laid at least 2 to 3 m deep to collect /water from the basements

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