Evaluation of the Long Term Impacts of an Infiltration BMP.
The natural hydrologic cycle is severely disrupted by development because the water that used to infiltrate into the ground is now running off into nearby streams. The negative impact of development on streams includes increased stream bank erosion, pollutant levels, and decreased base flow. Best management practices (BMPs) are recommended by regulatory agencies because they can mitigate peak flow, provide treatment, and partially restore the natural hydrologic cycle. BMP is a broad term used to describe a host of structures and activities; they are classified as structural (e.g. infiltration basin) or non structural (e.g. street cleaning). While infiltration BMPs are gaining acceptance, there is a concern that infiltrating stormwater has solved one problem by improving stream quality, but has caused another by contaminating the groundwater. To date, there have not been many opportunities to study the long term effects of infiltration. However, two 85 to 100 year old infiltration pits were discovered on the campus of Villanova University. Soil samples were collected from these pits and were tested for copper. Copper was selected based on the contaminants seen in the stormwater at other Villanova BMP sites. One of the pits has low infiltration rates and a plan to restore its infiltration capacity is described. This restored infiltration pit will serve as a permanent demonstration and research site, joining a collection of BMPs at Villanova University.
|Main Author:||Welker, Andrea L.|
|Other Authors:||Gore, Matthew., Traver, Robert.|