Waste Water Engineering
Traps

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

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Waste Water Engineering
The pressure exerted by

The internal pressure if any, causes tensile stress in the pipe material
The sewage when running full from inside, is called internal pressure
All listed here
Pressure sewers are designed to be safe in tension

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