ABSTRACT
Weir overflow rate is a measure of the gallons per day flowing over each foot of weir.
Weir Overflow, Flow, Rate Weir Length, ft
CALCULATING WEIR CIRCUMFERENCE In some calculations of weir ovefflow rate, you will have to calculate the total weir length given the weir diameter. To calculate the length of weir around the clarifier, you need to know the relationship between the diameter and circumference of a circle. The distance around any circle (circumference) is about three times the distance across the circle (diameter). In fact, the circumference is (3.14) (Diameter).* Therefore, given a diameter, the total ft of weir can be calculated as:
ft ft
100 ft weir
Weir Overflow , Flow, gpd Rate - Weir Length, ft
Example 2: (Weir Overflow Rate) D A circular clarifier receives a flow of 3.38 MGD. If the diameter of the weir is 80 ft, what is the weir overflow rate in gpd/ft?
