What is one function of retaining walls in erosion control?

Retaining walls play a crucial role in erosion control by providing structural support to slopes, especially at the toe, which is the lower part of the slope where it meets the level ground. By stabilizing the toe of the slope, retaining walls help to prevent the soil from eroding away, which can lead to landslides or other forms of slope failure. They work by holding back soil and resisting the lateral forces exerted by the groundwater and any overlying soil.

The use of retaining walls effectively manages the water flow and helps to mitigate erosion by ensuring that the slope remains intact. This stabilization is particularly important in areas prone to heavy rainfall or where the natural topography results in high water runoff, thereby protecting both the immediate environment and any structures nearby from potential erosion and damage.