Understanding drivers of freshwater contamination is essential for maintaining ecosystem functioning and preserving water supply. Although many studies have focused on contaminant delivery in areas downstream of major urban centers and agricultural areas, the associated flow pathways are poorly understood. Furthermore, there are a lack of studies evaluating water quality in systems that traverse multiple land uses, such as a rural to urban gradient, where both point and non-point sources can have an impact on water quality. This study addresses these knowledge gaps by examining the impact and delivery of both land use practices (i.e., urban, agricultural, pasture, etc.) and point sources (i.e., wastewater treatment plants) on streamwater metal, nutrient, salt, and sediment concentrations and yields in a mixed-use watershed. The efficacy of riparian buffers for reducing contaminant loading was also explored. Our preliminary results show a statistical link between streamwater specific conductivity (SPC) values and the percentage of roads, structures, and other impervious surfaces in upstream areas. Elevated streamwater SPC measurements during summer months suggest historical application of road salts has resulted in salinization of shallow groundwater, even in areas with lower population densities. Finally, the cumulative percentage of land use practices in upstream was a better predictor of water quality then those found within various stream buffer widths. Results of this study are of immediate relevance to local and state regulatory agencies seeking to establish more effective water quality regulations and land management strategies.   <br/>

Improving our understanding of point and non-point sources of contamination in a rural to urban watershed

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.