393. The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________? September 7, 2025 by Admin 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 10,000 litres/sqm/day ✅ The correct answer is option A.
