Waste Water Engineering
The normal values of over flow rates for secondary sedimentation tanks, ranges between

40,000 to 50,000 litres/sqm/day
25,000 to 35,000 litres/sqm/day
50,000 to 60,000 litres/sqm/day
80,000 to 10,000 litres/sqm/day

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Waste Water Engineering
Hydraulic mean radius is

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

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