Bioretention systems are used to target the removal of a wide range of pollutants, such as sediment, metals, hydrocarbons, and floatable litter, from stormwater runoff. They capture, filter, and treat runoff to remove contaminants before they enter natural water systems such as creeks and streams. A bioretention area can also reduce peak runoff rates, increase stormwater infiltration, or groundwater recharge, and manage water volumes during and after storm events.