Abstract
Urban land use has been implicated as a major contributor of nonpoint source pollution in aquatic systems. Through increased nonpoint delivery of pollutants, including constituents found in stormwater, Lake Tahoe is undergoing a marked decline in its transparency, primarily due to increasing production of algae from enhanced nutrient loading and delivery of fine particles to the lake from the watershed. In response to these findings, a regional restoration effort is underway to improve basin watersheds and the water quality in Lake Tahoe. In this study, stormwater autosamplers were used to collect flow-weighted composite samples that characterized event mean concentrations for event and nonevent conditions within a small, urbanized watershed in the Tahoe basin. An event-specified constant-concentration water quality model was then applied to the event mean concentration and continuous streamflow data to estimate pollutant loads for nitrate, nitrite, ammonia, orthophosphate, and suspended sediment. These data were compared with previously reported load estimates from 10 primary monitored streams in larger watersheds of the Tahoe basin. Results from a linear regression analysis demonstrate strong and significant relationships between watershed impervious area and pollutant loadings from Lake Tahoe watersheds. These small, urbanized watersheds and intervening zones, which only comprise 10 % of the total Lake Tahoe drainage area, include a significant portion of the total Lake Tahoe impervious area. The findings of this study suggest that small, urbanized watersheds and intervening zones are disproportionately important contributors of nonpoint source pollution, including nutrients and suspended particles.
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Acknowledgments
We thank Scott Cecchi and Scott Carroll from the California Tahoe Conservancy and Amy Green from Placer County who provided grant funding and logistical support for this project. We also want to thank Domi Fellers and Scott Brown at the Nevada Tahoe Conservation District and Michael Broadhurst at the Tahoe Resource Conservation District for their help in coordinating this effort and providing field sampling support. We also want to acknowledge the University of California at Davis for providing the meteorological data. Mary Miller at the Desert Research Institute Water Analysis Laboratory provided assistance with sample processing and analyses.
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Rios, D.T., Chandra, S. & Heyvaert, A.C. The importance of small urbanized watersheds to pollutant loading in a large oligotrophic subalpine lake of the western USA. Environ Monit Assess 186, 7893–7907 (2014). https://doi.org/10.1007/s10661-014-3975-3
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DOI: https://doi.org/10.1007/s10661-014-3975-3