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

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

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

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

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