Waste Water Engineering
The detention time (t) of a settling tank, may be defined as the time required for

The flow of sewage to fill the tank
A particle to travel from top surface to bottom sludge zone
None of these
A particle to travel along its length

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Waste Water Engineering
Hydraulic mean radius is

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

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