French Drain Slope Calculator

Calculate French Drain Slope



Formula

To calculate the slope of a French drain:

\[ S = \left( \frac{D}{L \times 12} \right) \times 100 \]

Where:

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.

Example Calculation 1

Let's assume the following values:

Using the formula:

\[ S = \left( \frac{6}{10 \times 12} \right) \times 100 = \left( \frac{6}{120} \right) \times 100 = 5\% \]

The French Drain Slope is 5%.

Example Calculation 2

Let's assume the following values:

Using the formula:

\[ S = \left( \frac{12}{20 \times 12} \right) \times 100 = \left( \frac{12}{240} \right) \times 100 = 5\% \]

The French Drain Slope is 5%.