The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?
(A) 25,000 to 35,000 litres/sqm/day
(B) 40,000 to 50,000 litres/sqm/day
(C) 50,000 to 60,000 litres/sqm/day
(D) 80,000 to 100,000 litres/sqm/day

