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Best Management Practices (BMPs) are measures designed to manage excess stormwater runoff and prevent degradation and enhance overall water quality. These measures manage stormwater quality through the control, capture and treatment of stormwater pollutants, ensure erosion and sediment control, and provide aesthetic benefits in many cases. City of Warrenville BMP Poster Bioswales are vegetated drainage ways that function by slowing runoff as it comes off an impervious surface, such as parking area. Bioswales remove sediments and other pollutants and provide infiltration into the soil during small rain events. Maintaining and enhancing natural drainage ways can save money by eliminating the need to install storm sewers. Native Landscaping: One of the easiest ways to enhance the landscape's ability to manage water more sustainably is to strategically install landscaping that features native plants of the tall grass prairie region. Native plants have deep root systems that will help build soil quality which increases infiltration and reduces runoff. Native plants are tolerant of weather extremes and don't need fertilizers or pesticides. Native plants also create habitat for birds, wildlife, butterflies and other species. After establishment, native landscaping is less expensive and easier to maintain.
Rain Gardens perform bioretention services but do not have an engineered subgrade. Rain gardens rely on healthy soils with good infiltration and percolation rates to manage ponded runoff water. A thorough soils investigation is needed to ensure a proposed rain garden site has soils with adequate percolation rates. Rain gardens are typically used in residential settings to manage runoff from smaller impervious surface surfaces like roofs. In some residential development, soils are altered and compacted and require an engineered subgrade to ensure drain down time of 12 to 24 hours.
Naturalized Detention Basin designs emulate natural lake or wetland systems by utilizing native plants along the water's edge and on side slopes. Effective detention designs dramatically reduce runoff rates, prevent most increases in flooding associated with new development, reduce run off pollutants, prevent erosion, and provide desirable habitat for birds and aquatic organism.
Permeable pavement: Transportation surfaces (roads, parking lots, driveways) account for over 60% of impervious urban surfaces. Permeable pavement allows rainfall to infiltrate down rather than running off into storm sewers. Rainfall moves into a rock chamber below the pavement. Water in the pore space between the aggregate either percolates out and down through surrounding soils or moves to a perforated drain pipe installed in the rock chamber. Water is slowly released to become ground flow or enter surface waters after it has been cleaned and cooled by moving through the pavement and underground rock chamber.
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