Waste Water Engineering
‘Cowl’ is provided at

Lower end of ventilating column
First step in manhole
Upper end of ventilating column
Upper end of the manhole

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Waste Water Engineering
Hydraulic mean radius is

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

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