Waste Water Engineering
Hydraulic mean radius is

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

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Waste Water Engineering
The clarigesters are

Circular Imhoff double storey tanks without bottom hoppers
Rectangular septic tanks
Circular Imhoff double tanks with bottom hoppers
Circular septic tanks

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