Faithin Omaha eBook Collection

Download or read book A Field Study to Evaluate Permeable Pavement Surface Infiltration Rates, Runoff Quantity, Runoff Quality, and Exfiltrate Quality written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The surface infiltration rates of 48 permeable pavement sites were tested in North Carolina, Maryland, Virginia, and Delaware. Two surface infiltration tests (pre- and post-maintenance) were performed on 15 concrete grid paver (CGP) lots filled with sand. Maintenance consisted of removing the top layer of residual material (13 - 19 mm (0.5 -- 0.75 in)). Maintenance significantly (p = 0.007) improved the surface infiltration rate. The median site surface infiltration rate increased from 4.9 cm/h (1.9 in/h) for existing conditions to 8.6 cm/h after simulated maintenance. Fourteen permeable interlocking concrete paver (PICP) and eleven porous concrete (PC) sites were also tested. PICP and PC sites built in close proximity to disturbed soil areas had surface infiltration rates that were significantly (p = 0.0014 and p = 0.0074, respectively) lower than stable landscape sites. Median PICP surface infiltration rates of for each condition were 80 cm/h (31 in/h) and 2000 cm/h (800 in/h), respectively. Median PC surface infiltration rates with and without fines were 13 cm/h (5.1 in/h) and 4000 cm/h (1600 in/h), respectively. This study showed that (1) the location of permeable pavements and (2) maintenance of permeable pavements were critical to maintaining high surface infiltration rates. Three permeable interlocking concrete pavements (PICP) sites were monitored for runoff quality in North Carolina in Cary, Goldsboro, and Swansboro. The Cary site was located in clay loam soil; 15 samples of exfiltrate and rainfall were analyzed for pollutant concentrations from February 2004 to November 2004. NH4-N, PO4, and Bound Phosphorus (BP) concentrations were significantly (p