What should I know about soil erosion near solar arrays?

Assessing Site Conditions

When preparing a site for a solar array ground mount, it’s essential to assess the soil conditions and identify potential erosion risks. Factors such as slope, soil type, and vegetation cover can influence the likelihood of erosion. A 3% to 5% slope is generally considered safe for solar arrays, but slopes above 10% may require additional measures to prevent erosion. Conducting a site survey and soil testing can help determine the best approach for the specific site conditions.

Implementing Erosion-Control Measures

To mitigate soil erosion, implement measures such as geotextiles or mulch. Geotextiles can be installed as a barrier under the solar array’s foundation, preventing soil sediment from washing away. Mulch, on the other hand, can be applied to the soil surface to reduce erosion by increasing soil porosity and preventing soil particles from being washed away. A 2-inch layer of mulch can be effective in reducing soil erosion. Regularly inspecting and maintaining these measures is crucial to their effectiveness.

Vegetation Management

Proper vegetation management is critical to preventing soil erosion near solar arrays. Removing weeds and other vegetation can help prevent soil erosion by reducing soil disturbance and preventing soil particles from being washed away. For areas with sensitive or native vegetation, consider using non-invasive, drought-tolerant plant species that can survive under the shaded conditions created by the solar array. Maintain a 3-foot buffer zone around the solar array to prevent overgrowth and ensure access for maintenance and inspections.