Scientific Investigations Report 2008–5202
Trends in streamflow and concentrations and loads of total phosphorus, total nitrogen, and nitrate were determined for the period from 1993 to 2003 in selected streams and rivers of the United States. Flow-adjusted trends in concentration (the trends that would have occurred in the absence of natural changes in streamflow), non-flow-adjusted trends in concentration (the trends resulting from both natural and human factors), and trends in load (trends in the nutrient mass transported downstream) were determined, and the results were examined spatially to determine whether a consistent pattern of trends occurred across groups of sites at multiple locations. Relations between the trends and changes in nutrient sources and streamflow are examined. See document for complete abstract.
First posted May 28, 2009
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Sprague, L.A., Mueller, D.K., Schwarz, G.E., and Lorenz, D.L., 2009, Nutrient trends in streams and rivers of the United States, 1993–2003: U.S. Geological Survey Scientific Investigations Report 2008–5202, 196 p.
Purpose and Scope
Nutrient Trends in Streams and Rivers of the United States, 1993–2003
Summary and Conclusions
Appendix 1. Study-site characteristics
Appendix 2. Model output for trends in daily mean streamflow from 1993 to 2003
Appendix 3. Model output for flow-adjusted trends in concentration, non-flow-adjusted trends in concentration, and trends in load from 1993 to 2003