Quantifying Water Budgets for Two Stormwater Detention Ponds in Coastal South Carolina

Event Location: 
BCCMWS Room 100
Event Date: 
Thursday, September 11, 2014 - 3:00pm
Event Type: 
SCMSS Seminar Series

Presenter: Samantha Maness

Due to their ability to retain pollutants and minimize pollutant impact on surrounding water bodies, stormwater detention ponds are commonly used stormwater management practices.  Stormwater engineers construct ponds to moderate peak flow intensities and to allow residence time of the water within the pond to enhance pollutant removal, however there are minimal field based studies evaluating their hydraulic effectiveness.  This study seeks to compare hydraulic effectiveness of two stormwater detention ponds located in coastal South Carolina to their theoretical design plan.  A high resolution water budget will be calculated over the course of one year, monitoring temporal variability associated with varying rainfall events and water table conditions.  Inflow components include surface inflow (sheetflow runoff and engineered drainage networks), groundwater inflow, and precipitation.  Outflow components include evaporation and surface outflow.  Interactions between groundwater and pond water are an important, yet often ignored, component of water budget estimations.  We will evaluate the significance of the groundwater component of water budgets for stormwater detention ponds by using a natural tracer 222Rn.  This research will later be coupled with the input pollutant fluxes compared to the output pollutant fluxes, resulting in an estimate of expected performance of residential stormwater detention ponds as structural best management practices along coastal South Carolina.