Design of Stormwater BMPs for Surface and Groundwater Protection Based on Site-Scale Soil Properties: Phase I
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2023-08-01
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Edition:Final Report: 7/7/2021 – 8/5/2023
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Abstract:Phase I of this research developed experimental methodologies to quantify and compare the rates and means of nitrogen and phosphorus transformations through diverse soil profiles. Six sites were selected for study from areas of distinct geologic history in Florida. Soils from the six sites were chosen to represent a gradient of clay and organic matter content, two constituents that were hypothesized to influence nutrient remediation potential in soils. A commercially available engineered infiltration media, Biosorption Activated Media (BAM), was also tested for comparison. Physical, chemical and biological attributes of the six soils and BAM were fully characterized. Each soil was subjected to extensive laboratory and field testing to parametrize hydraulics and nutrient transformation rates within the soil profile, including when exposed to simulated stormwater hydrology and nutrient loads. All soils effectively removed inorganic nitrogen and retained phosphorus; however, there were notable performance differences related to soil characteristics. The data largely support project hypotheses, that clay content and organic matter content positively influence nitrogen and phosphorus remediation. However, soils containing either the highest or lowest organic matter and clay contents did not perform as well as soils that contained moderate amounts of both. BAM also decreased concentrations of nitrogen and phosphorus, though with slightly less efficiency than soils. Though the research is preliminary, results underscore that nutrient cycling potential of project site soils should be understood before soils are amended for the purpose of remediating stormwater nutrients. This Phase I study suggests that nutrient remediation potential may be predictable based on soil properties.
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