Two bioretention cells were constructed in November 2003, at Joyner Park, on the banks of the Tar River. Both cells treat runoff from parking lots and adjoining park land. Louisburg-1 treats a 0.9 ac, 95% impervious watershed, and Louisburg-2 treats a 0.54 ac, 45% impervious watershed. Nutrient removal, runoff reduction, and ET vs. exfiltration losses were examined at this research site. This project was funded by a 319(h) grant administered by NC DENR. Results of this study site are available in Li et al. (2009) [Journal of Hydrologic Engineering], and Shakery (2006) [M.S. Thesis].

Monitoring Period: June 2004 - December 2004

Media Depth: both cells: 2 - 2.5 ft

Media Characteristics: sandy loam with 5% organic matter (dry peat moss). The fill media had a low P-Index.

Drainage Configuration: conventional drainage

In-situ soil: tight clay (saturated hydraulic conductivity: 0.04 - 0.47 in/hr)

Vegetative Cover: mulch/tree/shrub/perennials

Additional Note: Louisburg-1: unlined & Louisburg-2: lined by impermeable membrane