Bioretention
A bioretention basin, also referred to as a rain garden, is a landscaped depression filled with native plants, a specialized soil mix, and landscape materials. These basins are strategically placed on properties to capture and treat stormwater runoff from impervious surfaces like parking lots and rooftops, and are an approved stormwater control measure (SCM) by many municipalities.
Typical Inspection and Maintenance Concerns of Bioretention:
Bed Condition:
Check the health of the plants. Are they thriving? Look for signs of erosion or any trash. Does the mulch or stone need replenishing? If so, ensure the old layer is removed to prevent reducing the ponding volume.
Inlet and Outlet Inspection:
Ensure there is no sediment, trash, or vegetation growth that could block the outlets or inlets, which could cause improper drainage.
Water Bypassing:
Look for signs of water bypassing the bioretention basin, which may indicate issues with the system.
Post-Rainstorm Inspection:
Visit the bioretention area within 48 hours after a rainstorm to check for ponding. If ponding is present, maintenance may be necessary.
Fertilizer and Pesticide Use:
Avoid using fertilizers or pesticides within the bioretention basin, as they can negatively affect the system’s function.
Soil Compaction:
Prevent soil compaction by avoiding heavy equipment, such as riding lawnmowers, from being used in the basin area.