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Field Evaluation of Four Level Spreader-Vegetative Filter Strips to Improve Urban Storm-Water Quality.
- Source :
-
Journal of Irrigation & Drainage Engineering . Mar2011, Vol. 137 Issue 3, p170-182. 13p. 1 Color Photograph, 2 Diagrams, 15 Charts, 6 Graphs, 1 Map. - Publication Year :
- 2011
-
Abstract
- An assessment of the performance of four level spreader-vegetative filter strip (LS-VFS) systems designed to treat urban storm-water runoff was undertaken at two sites in the Piedmont of North Carolina. At each site, a 7.6-m grassed filter strip and a 15.2-m half-grassed, half-forested filter strip were examined. Monitored parameters included rainfall, inflow to, and outflow from each LS-VFS system. A total of 21 and 22 flow-proportional water quality samples were collected and analyzed for the Apex and Louisburg sites, respectively. All studied LS-VFS systems significantly reduced mean total suspended solids (TSS) concentrations (p<0.05), with the 7.6 and 15.2-m buffers reducing TSS by at least 51 and 67%, respectively. Both 15.2-m VFSs significantly reduced the concentrations of total Kjeldahl nitrogen (TKN), total nitrogen (TN), organic nitrogen (Org-N), and NH4-N (p<0.05), whereas results were mixed for the 7.6-m VFSs. Significant pollutant mass reduction was observed (p<0.05) for all nine pollutant forms analyzed in Louisburg, which was caused by infiltration in the VFSs. The effects of VFS length and/or vegetation type are very important for pollutant removal, as effluent pollutant concentrations were lower (with one exception) for the 15.2-m VFSs. The median effluent concentrations for TN and total phosphorus (TP) for the four LS-VFSs were nearly always better than fair water quality benchmarks for the Piedmont of North Carolina, but only met good water quality metrics in one-half of the studied storm events. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 07339437
- Volume :
- 137
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Irrigation & Drainage Engineering
- Publication Type :
- Academic Journal
- Accession number :
- 58754339
- Full Text :
- https://doi.org/10.1061/(ASCE)IR.1943-4774.0000173