Waste Water Engineering
Dilution method of disposing of sewage, is not preferred to

When sewage is fresh
When diluting water is used for water supply near the point of sewage disposed
When diluting water has high dissolved oxygen content
When the diluting water is having flow currents

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Waste Water Engineering
Hydraulic mean radius is

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

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