Waste Water Engineering
Hydraulic mean radius is

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

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Waste Water Engineering
The sewer pipes

Should resist the wear and tear caused due to abrasion
Are designed for generating self-cleansing velocities at different discharge
Carry sewage as gravity conduits
All listed here

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