Waste Water Engineering
The pressure exerted by

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

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Waste Water Engineering
The clarigesters are

Circular Imhoff double storey tanks without bottom hoppers
Circular septic tanks
Circular Imhoff double tanks with bottom hoppers
Rectangular septic tanks

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