Enter the total runoff area (ft^2) and the total inches of rainfall (in) into the Runoff Volume Calculator. The calculator will evaluate and display the Runoff Volume.
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Runoff Volume Formula
The following formula is used to calculate the Runoff Volume.
RV = RA * RF/12 / 7.481
- Where RV is the Runoff Volume (gallons)
- RA is the total runoff area (ft^2)
- RF is the total inches of rainfall (in)
How to Calculate Runoff Volume?
The following example problems outline how to calculate Runoff Volume.
Example Problem #1:
- First, determine the total runoff area (ft^2).
- The total runoff area (ft^2) is given as: 50.
- Next, determine the total inches of rainfall (in).
- The total inches of rainfall (in) is provided as: 2.
- Finally, calculate the Runoff Volume using the equation above:
RV = RA * RF/12 / 7.481
The values given above are inserted into the equation below:
RV = 50 * 2/12 / 7.481 = 1.113 (gallons)
Example Problem #2:
The variables needed for this problem are provided below:
total runoff area (ft^2) = 60
total inches of rainfall (in) = 3
Entering these values and solving gives:
RV = RA * RF/12 / 7.481 = 2.01 (gallons)
