Trails in Wet Areas (continued)

An open drain can be filled with gravel. This is called a French drain. Start with larger pieces of rock and gravel at the bottom, topping off with smaller aggregate (Figure 29). French drains are often used to drain a spring or seep from under a trail bed.

Figure 29—Wrapping French drains with geotextile helps
prevent clogging. These are used to drain
low–flow springs and seeps.

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