Two bioretention cells were constructed in 2001 at a shopping center located along Battleground Avenue in Greensboro, NC. Each cell treats 0.5 ac of parking lot and roof top runoff. One cell utilizes a conventional drainage system, while the other is designed with internal storage. The latter design forces water to temporarily store inside the cell's media, to promote denitrifying conditions. Both cells have been tested to determine pollutant removal and runoff volume reduction. Results of this study site are available in Hunt et al. (2006) [Journal of Irrigation & Drainage Engineering], Li et al. (2009) [Journal of Hydrologic Engineering], Hunt (2003) [Ph.D. dissertation], and Shakery (2006) [M.S. Thesis].

Monitoring Period: June 2002 - May 2003 & July 2003 - September 2004

Media Depth: both cells: 4 ft

Media Characteristics: saturated hydraulic conductivity 3-15 in/hr; P-Index high in Greensboro-2 (86-100) and low-medium in Greensboro-1 (20-26).

Drainage Configuration: [Greensboro-1]: internal water storage (IWS), depth 2 ft. [Greensboro-2]: conventional drainage

In-situ soil: clay loam

Vegetative Cover: mulch/tree/shrub/perennials