Waste Water Engineering
The pressure exerted by

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

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Waste Water Engineering
Which one of the following statements regarding septic tanks is wrong?

The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
The depth of tank is kept equal to its width
A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
The minimum width of septic level is 90 cm

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