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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Waste Water Engineering
Hydraulic mean radius is

Difference in heads between two points in circular pipes
Mean of radii in a pipe line of varying cross -sections
Mean radius of sewer
Cross-sectional area/wetted perimeter

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Waste Water Engineering
In septic tanks,

The baffles or tees are extended up to top level of scum
Free board of 0.3 m may be provided
All listed here
The clear space between the baffle top and covering slab is about 7.5 cm

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