Waste Water Engineering
The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Sag pipe
Inverted syphon
all of these
Depressed sewer

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Waste Water Engineering
Hydraulic mean radius is

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

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