Enter the discharge rate (m^3/s) and the area (m^2) into the Calculator. The calculator will evaluate the Overflow Flow Rate. 

Overflow Flow Rate Formula

OFR = DR / A


  • OFR is the Overflow Flow Rate (m/s)
  • DR is the discharge rate (m^3/s)
  • A is the area (m^2)

To calculate Overflow Flow Rate, divide the discharge rate by the total area.

How to Calculate Overflow Flow Rate?

The following steps outline how to calculate the Overflow Flow Rate.

  1. First, determine the discharge rate (m^3/s). 
  2. Next, determine the area (m^2). 
  3. Next, gather the formula from above = OFR = DR / A.
  4. Finally, calculate the Overflow Flow Rate.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

discharge rate (m^3/s) = 78

area (m^2) = 20