Enter the distance and drop into the calculator to determine the slope of a sewer line. This calculator helps ensure the slope is adequate for waste flow.
Sewer Line Slope Formula
The following formula is used to calculate the slope of a sewer line.
S = (D / (L * 12)) * 100
Variables:
- S is the slope (%)
- D is the drop (inches)
- L is the distance (feet)
To calculate the slope of a sewer line, divide the drop in inches by the distance in feet converted to inches (multiply by 12), then multiply by 100 to get the percentage.
What is Sewer Line Slope?
Sewer line slope is the angle at which a sewer pipe is installed to ensure proper drainage. The slope is critical for the gravity flow of sewage and wastewater from a building to the municipal sewer system or septic tank. A slope that is too steep can cause liquids to flow too quickly, leaving solids behind and potentially causing blockages. Conversely, a slope that is too gentle may not provide enough force for waste to flow away, leading to stagnant water and potential backups. Proper slope is essential for the efficient and sanitary operation of a sewer system.
How to Calculate Sewer Line Slope?
The following steps outline how to calculate the Sewer Line Slope.
- First, measure the distance (L) from the start of the pipe to the end in feet.
- Next, measure the drop (D) in inches from the start of the pipe to the end.
- Use the formula S = (D / (L * 12)) * 100 to calculate the slope.
- Finally, calculate the Sewer Line Slope (S) in percentage.
- 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.
Distance (L) = 100 feet
Drop (D) = 24 inches
