Waste Water Engineering
Hydraulic mean radius is

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

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Waste Water Engineering
Pick up the incorrect statement from the following for allowing workers to enter sewers

The men entering the manhole should be advised to smoke in the sewer
The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
Warning signals should be erected
Proper tests for the presence of poisonous gases must be carried out

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