The normal values of over flow rates for sedimentation tanks using coagulent, ranges between

• 25, 000 to 35, 000 litres/sqm/day
• 40, 000 to 50, 000 litres/sqm/day
• 50, 000 to 60, 000 litres/sqm/day
• 80, 000 to 100, 000 litres/sqm/day
• none of these.