Waste Water Engineering
The effluent of a septic tank is

As good as that from a complete treatment
Fit for discharge into any open drain
None of these
Foul and contains dissolved and suspended solids

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Waste Water Engineering
The pressure exerted by

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

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