Waste Water Engineering
The pressure exerted by

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

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Waste Water Engineering
The clarigesters are

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

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