Enter the flow rate and head into the calculator to determine the required scupper size. The scupper size is the minimum area needed to drain water at the specified flow rate and head.
Scupper Size Formula
The following formula is used to calculate the scupper size.
SS = frac{FR}{3.33 times sqrt{H}}Variables:
- SS is the scupper size (square inches)
- FR is the flow rate (gallons per minute)
- H is the head (inches)
To calculate the scupper size, divide the flow rate by the product of 3.33 and the square root of the head.
What is a Scupper Size?
Scupper size refers to the minimum cross-sectional area of an opening required to drain water at a specific flow rate and head. Scuppers are openings in walls or parapets that allow for water to drain off flat roofs. The size of the scupper is critical to ensure that water does not accumulate on the roof, which can lead to structural damage or failure.
How to Calculate Scupper Size?
The following steps outline how to calculate the Scupper Size.
- First, determine the flow rate (FR) in gallons per minute.
- Next, determine the head (H) in inches.
- Next, gather the formula from above = SS = FR / (3.33 * sqrt(H)).
- Finally, calculate the Scupper Size (SS) in square inches.
- 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.
Flow rate (FR) = 100 gallons per minute
Head (H) = 4 inches