Enter the distance and drop into the calculator to determine the slope of a French drain. The slope is essential for ensuring proper drainage and preventing water from pooling.
French Drain Slope Formula
The following formula is used to calculate the slope of a French drain:
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 French drain, divide the drop in inches by the distance in feet, then multiply by 12 to convert feet to inches, and finally multiply by 100 to get the percentage.
What is a French Drain Slope?
A French drain slope is the gradient or incline of the drain that allows water to flow away from a specific area. The slope is critical to the functionality of a French drain system, as it ensures that water is directed away from the foundation of a building or a particular area of a yard. A proper slope prevents water from stagnating and helps to protect structures and landscapes from water damage.
How to Calculate French Drain Slope?
The following steps outline how to calculate the French Drain Slope.
- First, measure the distance (L) of the French drain in feet.
- Next, measure the drop (D) from the beginning to the end of the French drain in inches.
- Use the formula S = (D / (L * 12)) * 100 to calculate the slope (S).
- Finally, enter the distance and drop into the calculator to get the slope percentage.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Distance (L) = 100 feet
Drop (D) = 8 inches
