National Water-Quality Assessment (NAWQA) Program
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Jurgens, B.C., Böhlke, J.K., and Eberts, S.M., 2012, TracerLPM (Version 1): An Excel® workbook for interpreting groundwater age distributions from environmental tracer data: U.S. Geological Survey Techniques and Methods Report 4-F3, 60 p. Available Online
Nystrom, E.A., and Burns, D.A., 2011, TOPMODEL simulations of streamflow and depth to water table in Fishing Brook Watershed, New York, 2007-09: U.S. Geological Survey Scientific Investigations Report 2011-5190, 54 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
Walter, D.A., and Starn, J.J., 2013, The use of process models to inform and improve statistical models of nitrate occurrence, Great Miami River Basin, southwestern Ohio: U.S. Geological Survey Scientific Investigations Report 2012-5001, 75 p. Available Online
Bachman, L.J., Zynjuk, L.D., and Phillips, P.J., 1992, The significance of hydrologic landscapes in estimating nitrogen loads in base flow to estuarine tributaries of Chesapeake Bay: EOS, Transactions, American Geophysical Union, vol. 73, no. 14, Spring Meeting Supplement, p. 113.
Alexander, Richard B., Boyer, E.W., Smith, R.A., Schwarz, G.E., and Moore, R.B., 2007, The role of headwater streams in downstream water quality: Journal of the American Water Resources Association, vol. 43, no. 1, p. 41-59. doi: 10.1111/j.1752-1688.2007.00005.x Available Online
Bryant, Jr., Wade L., and Goodbred, Steven L., 2008, The response of hydrophobic organics and potential toxicity in streams to urbanization of watersheds in six metropolitan areas of the United States: Environmental Monitoring and Assessment, 29 p. doi: 10.1007/s10661-008-0546-5 Available Online
Bryant, W.L., and Carlisle, D.M., 2012, The relative importance of physicochemical factors to stream biological condition in urbanizing basins: evidence from multimodel inference: Freshwater Science, vol. 31, no. 1, p. 154-166 doi: 10.1899/10-131.1 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
Tate, C.M., and Heiny, J.S., 1995, The ordination of benthic invertebrate communities in the South Platte River Basin in relation to environmental factors: Freshwater Biology, vol. 33, no. 3, Denver, Colorado, p 439-454. doi: 10.1111/j.1365-2427.1995.tb00405.x 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
Welch, H.L., Green, C.T., Coupe, R.H., 2011, The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA: Hydrogeology Journal, 14 p., online in advance of print. doi: 10.1007/s10040-011-0748-8 Available Online
Coles, J.F., Cuffney, T.F., McMahon, G., and Beaulieu, K.M., 2004, The effects of urbanization on the biological, physical, and chemical characteristics of coastal New England streams: U.S. Geological Survey Professional Paper 1695, 47 p. Available Online
Brown, L.R., Gray, R., Hughes, R, and Meador, M.R., editors, 2005, The effects of urbanization on aquatic ecosystems: American Fisheries Society, Symposium 47, Bethesda, Maryland, 423 p.
Gurdak, Jason J., Walvoord, Michelle A., and McMahon, Peter B., 2008, Susceptibility to enhanced chemical migration from depression-focused preferential flow, High Plains aquifer: Vadose Zone Journal, vol. 7, no. 4, p. 1172-1184. doi: 10.2136/vzj2007.0145 Available Online
Wise, D.R., and Johnson, H.M., 2011, Surface-water nutrient conditions and sources in the United States Pacific Northwest: Journal of the American Water Resources Association, online 22Aug2011 in advance of print, 26 p. doi: 10.1111/j.1752-1688.2011.00580x Available Online
McMahon, Gerald, Alexander, R.B., and Qian, S., 2003, Support of Total Maximum Daily Load programs using spatially referenced regression models: ASCE Journal of Water Resources Planning and Management, vol. 129, no. 4, p. 315-329. doi: 10.1061/(ASCE)0733-9496(2003)129:4(315) Available Online
Asher, W., Bender, D.A., Zogorski, J.S., and Bartholomay, R.C., 2006, StreamVOC-A deterministic source-apportionment model to estimate volatile organic compound concentrations in rivers and streams: U.S. Geological Survey Scientific Investigations Report 2006-5110, 167 p. Available Online
McMahon, P.B., Dennehy, K.F., Bruce, B.W., Böhlke, J.K., Michel, R.L., Gurdak, J.J., and Hurlbut, D.B., 2006, Storage and transit time of chemicals in thick unsaturated zones under rangeland and irrigated cropland, High Plains, United States: Water Resources Research, vol. 42, W03413, 18 p. doi: 10.1029/2005WR004417 Available Online
Smith, Richard A., Alexander, Richard B., Tasker, Gary D., Price, Curtis V., Robinson, Keith W., and White, Dale A., 1993, Statistical modeling of water-quality in regional watersheds: Watershed '93, p. 751-754.
Clark, Gregory M., and Ott, D.S., 1996, Springflow effects on chemical loads in the Snake River, south-central Idaho: Journal of the American Water Resources Association, vol. 32, no. 3, June 1996, p. 553-563. doi: 10.1111/j.1752-1688.1996.tb04053.x Available Online
Preston, S.D., Alexander, R.B., Schwarz, G.E., and Smith, R.A., 2014, Spatially Explicit Modeling to Evaluate Regional Stream Water Quality: In: Ahuja S. (ed.) Comprehensive Water Quality and Purification, vol. 1, p. 221-244. Available Online
Nolan, Bernard T., Baehr, Arthur L., and Kauffman, Leon J., 2003, Spatial variability of groundwater recharge and its effect on shallow groundwater quality in southern New Jersey: Vadose Zone Journal, vol. 2, p. 677-691. Available Online
Hoos, A.B., and McMahon, Gerard, 2009, Spatial analysis of instream nitrogen loads and factors controlling nitrogen delivery to streams in the southeastern United States using spatially referenced regression on watershed attributes (SPARROW) and regional classification frameworks: Hydrological Processes, vol. 23, no. 16, p. 2275-2294. doi: 10.1002/hyp.7323 Available Online
Robertson, D.M., and Saad, D.A., 2013, SPARROW Models Used to Understand Nutrient Sources in the Mississippi/Atchafalaya River Basin: Journal of Environmental Quality, vol. 42, no. 5, p. 1422-1440. doi: 10.2134/jeq2013.02.0066 Available Online
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