This page lists some of the fundamental factors you should consider when designing
a bioretention area for a highway, a neighborhood street, or a general roadway.
These facts can guide you when modifying the basic AutoCAD file to suit your
particular site. Detailed design and construction information can be found in
The Bioretention Manual1 available from Prince George's County
Department of Environmental Resources Programs and Planning Division. The County
also has available in bulk form for distribution various educational materials
that can be used if the bioretention area will require maintenance by homeowners.
Please call the County at (301) 883-5834 for more information.
The success of a bioretention cell is extremely dependent on both a designer
developing proper installation specifications and a contractor properly
implementing them. Remember that poor construction techniques can cause the
best-designed facility to fail prematurely. Construction technique and inspection
are critical to ensure proper landscaping, soil mixtures, and grading around the
facility, as well as the use of approved materials. Keep in mind that the plant
and soil components are crucial elements of the facility and are the key to the
bioretention cell's basic function. A plant list of 150 suitable perennials is
provided in The Bioretention Manual and should be used when selecting
plants for mid-Atlantic regions. Soil mixture guidelines are also provided in the
manual and should be followed closely.