Waste Water Engineering
Hydraulic mean radius is

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

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Waste Water Engineering
The sewers

Must be laid at least 2 to 3 m deep to collect /water from the basements
All listed here
Must flow under gravity ½ to ¾ full
Must be of adequate size to avoid over flow

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