National Water-Quality Assessment (NAWQA) Program
More Information about Modeling
Modeling and Software
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McMahon, P.B., Dennehy, K.F., Bruce, B.W., Bohlke, 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
Nolan, Bernard T., and Hitt, Kerie J., 2006, Vulnerability of shallow groundwater and drinking-water wells to nitrate in the United States: Environmental Science and Technology, vol. 40, no. 24, p. 7834-7840. doi: 10.1021/es060911u Available Online
Nowell, L.H., Crawford, C.G., Nakagaki, N., Thelin, G.P., and Wolock, D.M., 2006, Regression model for explaining and predicting concentrations of dieldrin in whole fish from United States streams: U.S. Geological Survey Scientific Investigations Report 2006-5020, 40 p. Available Online
Pankow, J.F., Asher, W.E., and Zogorski, J.S., 2006, Source apportionment modeling of volatile organic compounds in streams: Environmental Toxicology and Chemistry, vol. 25, no. 4, p. 921-932. Available Online
Squillace, P.J., and Moran, M.J., 2006, Factors associated with sources, transport, and fate of volatile organic compounds in aquifers of the United States and implications for ground-water management and assessments: U.S. Geological Survey Scientific Investigations Report 2005-5269, 40 p. Available Online
Stackelberg, P.E., Gilliom, R.J., Wolock, D.M., and Hitt, K.J., 2006, Development and application of a regression equation for estimating the occurrence of atrazine in shallow ground water beneath agricultural areas of the United States: U.S. Geological Survey, Scientific Investigations Report 2005-5287, 12 p. Available Online
Thoms, R.B., Johnson, R.L., and Healy, R.W., 2006, User's guide to the variably saturated flow (VSF) process for MODFLOW: U.S. Geological Survey Techniques and Methods, 6-A18, 58 p. Available Online
Vecchia, A.V., and Crawford, C.G., 2006, Simulation of daily pesticide concentrations from watershed characteristics and monthly climatic data: U.S. Geological Survey Scientific Investigations Report 2006-5181, 60 p. Available Online
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
Anning, D.W., Bauch, N.J., Gerner, S.J., Flynn, M.E., Hamlin, S.N., Moore, S.J., Schaefer, D.H., Anderholm, S.K., and Spangler, L.E., 2007, revised 2010, Dissolved solids in basin-fill aquifers and streams in the southwestern United States: U.S. Geological Survey Scientific Investigations Report 2006-5315, v. 1.1, 168 p. Available Online
Asher, W.E., Luo, Wentai, Campo, K.W., Bender, D.A., Robinson, K.W, Zogorski, J.S., and Pankow, J.F., 2007, Application of a source apportionment model in consideration of volatile organic compounds in an urban stream: Environmental Toxicology and Chemistry, vol. 26, no. 8, p. 1606-1613. doi: 10.1897/06-557 Available Online
Bales, J.D., and Nardi, M.R., 2007, Automated routines for calculating whole-stream metabolism-Theoretical background and user's guide: U.S. Geological Survey Techniques and Methods 4-C2, 33 p. Available Online
Carlisle, D.M., and Meador, M.R., 2007, A biological assessment of streams in the eastern United States using a predictive model for macroinvertebrate assemblages: Journal of the American Water Resources Association, vol. 43, p. 1194-1207. doi: 10.1111/j.1752-1688.2007.00097.x Available Online
Carlisle, D.M., Meador, M.R., Moulton II, S.R., and Ruhl, P.M., 2007, Estimation and application of indicator values for common macroinvertebrate genera and families of the United States: Ecological Indicators, vol. 7, p. 22-33. doi: 10.1016/j.ecolind.2005.09.005 Available Online
Coupe, Richard H., 2007, Use of a watershed model to characterize the fate and transport of fluometuron, a soil-applied cotton herbicide, in surface water: International Journal of Environmental Analytical Chemistry, vol. 87, no. 13, p. 883-896. doi: 10.1080/03067310701627819 Available Online
Crandall, C.A., 2007, Hydrogeologic setting and ground-water flow simulations of the Northern Tampa Bay regional study area, Florida, Section 5 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. 5-1 to 5-29. Available Online
Cuffney, T.F., Bilger, M.D., and Haigler, A.M., 2007, Ambiguous taxa: effects on the characterization and interpretation of invertebrate assemblages: Journal of the North American Benthological Society, vol. 26, no. 2, p. 286-307. doi: 10.1899/0887-3593(2007)26[286:ATEOTC]2.0.CO;2 Available Online
Goldstein, R.M., Meador, M.R., and Ruhl, K.E., 2007, Relative influence of streamflows in assessing temporal variability in stream habitat: Journal of the American Water Resources Association, vol. 43, p. 642-650. doi: 10.1111/j.1752-1688.2007.00051.x Available Online
Gurdak, J.J., McCray, J.E., Thyne, G.D., and Qi, S.L., 2007, Latin hypercube approach to estimate uncertainty in ground water vulnerability: Ground Water, vol. 45, p. 348-361. doi: 10.1111/j.1745-6584.2006.00298.x Available Online
Katz, Brian G., Crandall, Christy A., Metz, Patricia A., McBride, William S., and Berndt, Marian P., 2007, Chemical characteristics, water sources and pathways, and age distribution of ground water in the contributing recharge area of a public-supply well near Tampa, Florida, 2002-05: U.S. Geological Survey Scientific Investigations Report 2007-5139, 85 p. Available Online
Landon, M.K., and Turco, M.J., 2007, Hydrogeologic Setting and Ground-Water Flow Simulations of the Eastern High Plains Regional Study Area, Nebraska, Section 8 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. 8-1 to 8-26. Available Online
Lyford, F.P., Carlson, Carl S., Brown, Craig J., and Starn, J. Jeffrey, 2007, Hydrogeologic setting and ground-water flow simulations of the Pomperaug River Basin Regional Study Area, Connecticut, Section 6 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. 6-1 to 6-24. Available Online
McMahon, G., 2007, Consequences of land-cover misclassification in models of impervious surface: Photogrammetric Engineering & Remote Sensing, vol. 73, no. 12, p. 1343-1353. Available Online
McMahon, P.B., Bohlke, J.K., and Carney, C.P., 2007, Vertical gradients in water chemistry and age in the northern High Plains aquifer, Nebraska, 2003: U.S. Geological Survey Scientific Investigations Report 2006-5294, 58 p. Available Online
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 1737A, 244 p. Available Online
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