Hydrology and Pollutant Removal Performance in Detention Ponds Typical of the Lower Coastal Plain of South Carolina

The overall goal of this project is to provide resource managers and stormwater engineers with locally relevant quantitative information on the extent to which residential stormwater detention ponds typical of the coastal plain of SC can be expected to offer an effective means of moderating hydrologic flows and pollutant loads from developed landscapes. The specific objectives of the proposed study are to:1) Quantify the complete water budget (surface runoff, groundwater input, precipitation, evapotranspiration, storage, and total export) for selected stormwater pond continuously throughout the year; 2) Quantify concentrations of total nitrogen, total phosphorus, suspended solids, and fecal indicator bacteria in pond outfall waters, relative to input waters, to determine detention pond effectiveness in reducing these pollutants; 3) Quantify and compare water budgets and pollutant removal performance in a pair of typically constructed detention ponds that vary with respect to their drainage basin’s degree of residential development density, and therefore amount of impervious surface [Year 1], and then a pair of ponds that vary in the degree of direct connection between impervious surfaces and detention pond; and 4) Incorporate research findings into technical recommendations on the range of pollutant removal efficiencies and hydrologic performance that can be expected for existing stormwater detention ponds typical of coastal SC and disseminate these finding to regulatory agencies, local stormwater managers, pond management professionals, homeowner associations and the broader scientific community.