||GeoSyntec Consultants, Norcross, GA.; Wright Water Engineers, Inc., Denver, CO.; Environmental Protection Agency, Washington, DC.; Federal Highway Administration, Washington, DC.
The following summaries analyze available monitoring data drawn from the International Stormwater Best Management Practices (BMP) Database to determine whether any differences in treatment performance may be determined based on BMP category (e.g. detention basin, media filter, wetland basin, etc). These summaries focus on two separate data analyses: A data set composed of each BMP study's average effluent event mean concentrations (EMCs) over the entire respective monitoring period, grouped by BMP category; A data set comprised of all of the individual effluent EMCs, grouped by BMP Category. For each water quality constituent examined, only those BMP studies reporting at least 3 influent and effluent EMCs were included in either data set. While this minimum threshold permits the actual calculation of the reported statistics (mean, median, percentiles, etc.), the robustness of such statistics is limited for these smallest samples.