Evaluating a bioretention pond for flood protection and contaminant removal in urban environments
Additional Document Info
Urban stormwater runoff is a major source of contaminants to receiving water bodies. In addition, impervious areas generate large runoff volumes from large rainfall events, which could result in downstream flooding. A two-cell rain garden area was designed and constructed to route the stormwater runoff generated from the parking lot of a research station in Dallas, TX. The runoff volume caused flooding in a community gardens project adjacent to the poorly drained parking lot. The rain garden is designed to route the flow around the community garden and remove potential contaminants found in the runoff, which eventually drains into the municipal stormwater network. Native and adapted ornamental vegetation was selected to increase biodiversity and nutrient removal from the rain garden. Inflow, outflow and storage volumes are monitored and water samples are collected on event basis and analyzed for nitrate-nitrogen (N03), total phosphorus (Total P) and sediments. The design, construction and monitoring systems in the bioretention area will be presented in this paper.