National Water-Quality Assessment (NAWQA) Program
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Sheets, R.A., 2007, Hydrogeologic Setting and Ground-Water Flow Simulations of the Great Miami River Basin Regional Study Area, Ohio, Section 7 in Paschke, Suzanne S., ed., 2007, Hydrogeologic settings and ground-water flow simulations for regional studies of the transport of anthropogenic and natural contaminants to public-supply wells--studies begun in 2001: U.S. Geological Survey Professional Paper 1737-A, p. 7-1 to 7-21. Available Online
Scott, J.C., 1990, A statistical processor for analyzing simulations made using the modular finite-difference ground-water flow model: U.S. Geological Survey Water-Resources Investigations Report 89-4159, 218 p. Available Online
Schwarz, G.E., Alexander, R.B., Smith, R.A., and Preston, S.D., 2011, The regionalization of national-scale SPARROW models for stream nutrients: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 22 p. doi: 10.1111/j.1752-1688.2011.00581.x Available Online
Schelker, J., Burns, D.A., Weiler, M., and Laudon, H., 2011, Hydrological mobilization of mercury and dissolved organic carbon in a snow-dominated, forested watershed: Conceptualization and modeling : Journal of Geophysical Research, vol. 116, G01002, 17 p. doi:10.1029/2010JG001330 Available Online
Schaefer, D.H., Green,J.M., and Rosen, M.R., 2007, Hydrogeologic Settings and Ground-Water Flow Simulations of the Eagle Valley and Spanish Springs Valley Regional Study Areas, Nevada, Section 3 in Paschke, Suzanne S., ed., 2007, Hydrogeologic settings and ground-water flow simulations for regional studies of the transport of anthropogenic and natural contaminants to public-supply wells--studies begun in 2001: U.S. Geological Survey Professional Paper 1737-A, p. 3-1 to 3-31. Available Online
Sauer, T.J., Alexander, R.B., Brahana, J.V., and Smith, R.A., 2001, The importance and role of watersheds in the transport of nitrogen: in Follett, R.F. and Hatfield, J.L., eds., Chapter 7 Nitrogen in the Environment: Elsevier, p. 147-181. Available Online
Saleh, D.K., Kratzer, C.R., Green, C.H., and Evans, D.G., 2009, Using the Soil and Water Assessment Tool (SWAT) to simulate runoff in Mustang Creek Basin, California: U.S. Geological Survey Scientific Investigations Report 2009-5031, 28 p. Available Online
Saad, David A., and Thorstenson Donald C., 1998, Flow and geochemistry along shallow ground-water flowpaths in an agricultural area in southeastern Wisconsin: U.S. Geological Survey Water-Resources Investigations Report 98-4179, 62 p. Available Online
Saad, D.A., Schwarz, G.E., Robertson, D.M., and Booth, N.L., 2011, A multi-agency nutrient dataset used to estimate loads, improve monitoring design, and calibrate regional nutrient SPARROW models: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 17 p. doi: 10.1111/j.1752-1688.2011.00575.x Available Online
Rupert, Michael G., 1999, Improvements to the DRASTIC ground-water vulnerability mapping method: U.S. Geological Survey Fact Sheet 066-99, 6 p. Available Online
Rowe, G.L., Jr., Gilliom, R.J., and Woodside, M.D., 2013, Tracking and forecasting the Nation's water quality--Priorities and strategies for 2013-2023: U.S. Geological Survey Fact Sheet 2013-3008, 6 p. Available Online
Robertson, Dale M., Schwarz, Gregory E., Saad, David A., and Alexander, Richard B., 2009, Incorporating uncertainty into the ranking of SPARROW model nutrient yields from the Mississippi/Atchafalaya River Basin watersheds: Journal of the American Water Resources Association, vol. 45, no. 2, April 2009, p. 534-549. doi: 10.1111/j.1752-1688.2009.00310.x Available Online
Robertson, Dale M., and Richards, Kevin D., 2000, Influence of different temporal sampling strategies on estimating loads and maximum concentrations in small streams: Conference Proceedings NWQMC National Monitoring Conference 2000, Monitoring for the Millennium, p. 209-223.
Robertson, Dale M., 1996, Use of frequency-volume analyses to estimate regionalized yields and loads of sediment, phosphorus, and polychlorinated biphenyls to Lakes Michigan and Superior: U.S. Geological Survey Water-Resources Investigations Report 96-4092, 47 p. Available Online
Robertson, D.M., and Saad, D.A., 2001, Nutrient inputs to the Laurentian Great Lakes by source and watershed estimated using SPARROW watershed models: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 23 p. doi: 10.1111/j.1752-1688.2011.00574.x Available Online
Rebich, R.A., Houston, N.A., Mize, S.V., Pearson, D.K., Ging, P.B., and Hornig, C.E., 2011, Sources and delivery of nutrients to the northwestern Gulf of Mexico from streams in the South-Central United States: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 26 p. doi: 10.1111/j.1752-1688.2011.00583.x Available Online
Rebich, R.A., and Demcheck, D.K., 2007, Trends In Nutrient and Sediment Concentrations and Loads In Major River Basins of the South-Central United States, 1993-2004: USGS Scientific Investigations Report 2007-5090, 112 p. Available Online
Qian, Song S., and Cuffney, Thomas F., 2012, To threshold or not to threshold? That's the question: Ecological Indicators, vol. 15, no. 1, p. 1-9. doi: 10.1016/j.ecolind.2011.08.019 Available Online
Qian, S.S., Cuffney, T.F., Alameddine, Ibrahim, McMahon, Gerard, and Reckhow, K.H., 2010, On the application of multilevel modeling in environmental and ecological studies: Ecology, vol. 91, no. 2, p. 355-361, published on-line. Available Online
Puckett, Larry J., Cowdery, T.K., Lorenz, D.L., and Stoner, J.D., 1999, Estimation of nitrate contamination of an Agro-Ecosystem Outwash Aquifer using a nitrogen mass-balance budget: Journal of Environmental Quality, vol. 28, no. 6, Nov.-Dec. 1999, p. 2015-2025. Available Online
Puckett, L.J., and Hughes, W.B., 2005, Transport and Fate of Nitrate and Pesticides: Hydrogeology and Riparian Zone Processes: Journal of Environmental Quality, vol. 34, no. 6, p 2278-2292. doi: 10.2134/jeq2005.0109 Available Online
Preston, Stephen D., Alexander, Richard B., Woodside, Michael D., and Hamilton, Pixie A., 2009, SPARROW modeling - Enhancing understanding of the Nation's water quality: U.S. Geological Survey Fact Sheet 2009-3019, 6 p. Available Online
Preston, S.D., Alexander, R.B., Schwarz, G.E., and Crawford, C.G., 2011, Factors affecting stream nutrient loads: A synthesis of regional SPARROW model results for the continental United States: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 25 p. doi: 10.1111/j.1752-1688.2011.00577.x Available Online
Preston, S.D., Alexander, R.B., and Woodside, M.D., 2011, Regional assessments of the Nation's water quality--Improved understanding of stream nutrient sources through enhanced modeling capabilities: U.S. Geological Survey Fact Sheet 2011-3114, 6 p. Available Online
Preston, S.D., Alexander, R.B., and Wolock, D.M., 2011, SPARROW modeling to understand water-quality conditions in major regions of the United States: A featured collection introduction: Journal of the American Water Resources Association, online 22Aug2011, 4 p. doi: 10.1111/j.1752-1688.2011.00585.x Available Online
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