The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?

A. 25,000 to 35,000 litres/sqm/day

B. 80,000 to 100,000 litres/sqm/day

C. 50,000 to 60,000 litres/sqm/day

D. 40,000 to 50,000 litres/sqm/day
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