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<br />Pnncipie '/0. 10: Parking Loc l?unoff <br /> <br />These landscaped areas can be used for stormwater management. There are several options, including: <br />· bioretention facilities · perimeter sand filters <br />dry swales · filter strips <br /> <br />Bioretention Facilities <br /> <br />This technique uses planting strips to provide stormwater management (Figure 10.2). Runoff is directed <br />into a shallow, landscaped area and temporarily detained. The runoff then filters down through the bed <br />of the facility and is either infiltrated into the subsurface or collected in an underdrain pipe for discharge <br />into another stormwater management facility or into a stream. Bioretention-facilities can be attractively <br />integrated into landscaped areas and can be maintained by commercial landscaping firms. The vegetation <br />recommended for use in bioretention facilities is generally hardier than the species typically used in <br />parking lot landscapes. This is a particular advantage in urban areas where plants often fare poorly due <br />to poor soils and air pollution. <br /> <br />Figure 10.2: Bioretention Area (Prince Georges County, Maryland) <br /> <br /> <br />Bioretention encourages treatment of stormwater runoff at the source, before the rllnoff enters the stream <br />system. Other advantages include: <br /> <br />.. Can be used for snow storage during the winter season. <br /> <br />.. Requires relatively little engineering design in comparison to other storm water management <br />facilities (e.g., sand filters); <br /> <br />- 85 - <br />