Waste Water Engineering
The sewers

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