Eco express


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Bioretention Island


Keywords: bioretention island , rentention , vegetation , filtration , shed , watershed , impervious landscape , convex , concave , runoff , sediment , erosion , curb cut , aquatic , particles , parking lot , stormwater , storm water , rain water , storms , pollution ,

Do you notice bioretention islands in a parking lot? Bioretention islands are landscaping features adapted to treat stormwater runoff. They are most frequently located within parking lot islands but can also be incorporated into cul-de-sacs and small pocket gardens in residential land uses. Instead of raised planters, bioretention islands are depressions that collect and filter the first ½ inch of rainfall off paved surfaces. When properly designed, bioretention islands mimic natural ecosystems through species diversity and the density & distribution of this native vegetation. The vegetation absorbs stormwater and filters pollutants from the runoff.

Bioretention islands are typically used for stormwater management in small drainage areas, such as a small parking lot, or an individual residential property. However, they are quite versatile in that they can be employed in almost any soil condition. Even existing parking lot landscape islands can be retrofitted to incorporate bioretention.

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