Bioretention Performance, Design, Construction, and Maintenance
NCSU Cooperative Extension , 2006

Hunt, W.F., Lord, W.G.

Bioretention has become a common stormwater treatment practice in communities across North Carolina. Recent state and federal rules, including those for the Neuse and Tar-Pamlico river basins and EPA Stormwater Phase II, require that innovative devices, such as bioretention, be used in treating stormwater. In Cary and Greensboro, for example, bioretention is one of the two most frequently installed practices. Basic design guidance for bioretention (also termed rain gardens) was provided in 2001 in Designing Rain Gardens (Bio-Retention Areas), AG-588-3 part of this Urban Waterways Series by W. F. Hunt and N. M. White. Since the publication of that fact sheet, much research has been conducted on the effectiveness of bioretention in North Carolina and surrounding states. Findings from this research and anecdotal observation of bioretention function have led to more specific design, construction, and maintenance recommendations. These recommendations now address designing bioretention cells specifically to remove target pollutants, as well as preserve the fragile nature of bioretention cells.