Waste Water Engineering
Hydraulic mean radius is

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

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Waste Water Engineering
In septic tanks,

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

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