Waste Water Engineering
In sewers designed with self cleansing velocity,

The bottom is scoured
Neither silting nor scouring occurs at the bottom
Both silting and scouring occur at the bottom
The bottom is silted

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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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