National Water-Quality Assessment (NAWQA) Program
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Groschen, George E., Arnold, Terri L., Morrow, William S., and Warner, Kelly L., 2009, Occurrence and distribution of iron, manganese, and selected trace elements in ground water in the glacial aquifer system of the Northern United States: U.S. Geological Survey Scientific Investigations Report 2009-5006, 89 p. Available Online
Gurdak, J.J., McMahon, P.B., Dennehy, K.F., and Qi, S.L., 2009, Water quality in the High Plains aquifer, Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, 1999-2004: U.S. Geological Survey Circular 1337, 63 p. Available Online
Hinkle, S.R., Kauffman, L.J., Thomas, M.A., Brown, C.J., McCarthy, K.A., 2009, Combining particle-tracking and geochemical data to assess public supply well vulnerability to arsenic and uranium: Journal of Hydrology, v. 376, p. 132-142. Available Online
Mullaney, J.R., Lorenz, D.L., Arntson, A.D., 2009, Chloride in groundwater and surface water in areas underlain by the glacial aquifer system, northern United States: U.S. Geological Survey Scientific Investigations Report 2009-5086, 41 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
Sullivan, D.J., Vecchia, A.V., Lorenz, D.L., Gilliom, R.J., and Martin, J.D., 2009, Trends in pesticide concentrations in corn-belt streams, 1996-2006: U.S. Geological Survey Scientific Investigations Report 2009-5132, 75 p. Available Online
Vecchia, Aldo V., Gilliom, Robert J., Sullivan, Daniel J., Lorenz, David L., and Martin, Jeffrey D., 2009, Trends in concentrations and use of agricultural herbicides for Corn Belt rivers, 1996-2006: Environmental Science & Technology, accepted Oct. 20, 2009, 7 p. doi: 10.1021/es902122j Available Online
Alexander, R.B., Smith, R.A., Schwarz, G.S., Boyer, E.W., Nolan, J.V., and Brakebill, J.W., 2008, Differences in phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River Basin: Environmental Science and Technology, v. 42, no. 3, p. 822-830. doi: 10.1021/es0716103 Available Online
Arnold, T.L., Warner, K.L., Groschen, G.E., Caldwell, J.P., and Kalkhoff, S.J., 2008, Hydrochemical regions of the glacial aquifer system, northern United States, and their environmental and water-quality characteristics: U.S. Geological Survey Scientific Investigations Report 2008-5015, 84 p. Available Online
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, 7(4), p. 1172-1184. doi: 10.2136/vzj2007.0145 Available Online
U.S. Geological Survey, 2008, Relations of Water Quality to Agricultural Chemical Use and Environmental Setting at Various Scales - Results from Selected Studies of the National Water-Quality Assessment Program: U.S. Geological Survey Fact Sheet FS 2007-3088, 6 p. Available Online
Gurdak, J.J., Hanson, R.T., McMahon, P.B., Bruce, B.W., McCray, J.E.,Thyne, G.D., and Reedy, R.C., 2007, Climate variability controls on unsaturated-zone water and chemical movement, High Plains aquifer: Vadose Zone Journal, 6, p. 533-547. doi: 10.2136/vzj2006.0087 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, 45, p. 348-361. doi: 10.1111/j.1745-6584.2006.00298.x Available Online
McMahon, P.B., Dennehy, K.F., Bruce, B.W., Gurdak, J.J., and Qi, S.L., 2007, Water-quality assessment of the High Plains aquifer, 1999-2004: U.S. Geological Survery Professional Paper 1749, 136 p. 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
Weeks, E.P., and McMahon, P.B., 2007, Nitrous oxide fluxes from cultivated areas and rangeland: U.S. High Plains: Vadose Zone Journal, 6, p. 496-510. doi: 10.2136/vzj2006.0164 Available Online
Gurdak, J.J., and Qi, S.L., 2006, Vulnerability of Recently Recharged Ground Water in the High Plains Aquifer to Nitrate Contamination: USGS Scientific Investigations Report 2006-5050, 39 p. Available Online
McMahon, P.B., and Bohlke, J.K., 2006, Regional patterns in the isotopic composition of natural and anthropogenic nitrate in ground water, High Plains, USA: Environmental Science & Technology, 40, p. 2965-2970. doi: 10.1021/es052229q Available Online
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, v. 42, W03413, 18 p. doi: 10.1029/2005WR004417 Available Online
Qi, S.L., and Gurdak, J.J., 2006, Percentage of probability of nonpoint-source nitrate contamination of recently recharged ground water in the High Plains aquifer: U.S. Geological Survey Digital Data Series, DDS-192, on-line only. Available Online
Sprague, Lori A., Clark, Melanie L., Rus, David L., Zelt, Ronald B, Flynn, Jennifer L., and Davis, Jerri V., 2006, Nutrient and Suspended-Sediment Trends in the Missouri River Basin, 1993-2003: U.S. Geological Survey Scientific Investigations Report 2006-5231, 80 p. Available Online
Stanton, J.S., and Qi, S.L., 2006, Ground-water quality of the northern High Plains aquifer, 1997, 2002-04: U.S. Geological Survey Scientific Investigations Report 2006-5138, 59 p. Available Online
Scanlon, B.R., Reedy, R.C., Stonestrom, D.A., Prudic, D.E., and Dennehy, K.F., 2005, Impact of land use and land cover change on groundwater recharge and quality in the southwestern US: Global Change Biology, v. 11, p. 1577-1593. doi: 10.1111/j.1365-2486.2005.01026.x Available Online
McMahon, P.B., Bohlke, J.K., and Christenson, S.C., 2004, Geochemistry, radiocarbon ages, and paleorecharge conditions along a transect in the central High Plains aquifer, southwestern Kansas, USA: Applied Geochemistry, v. 19, p. 1655-1686. doi: 10.1016/j.apgeochem.2004.05.003 Available Online
Breton, W. Bruce, Becker, Mark F., Pope, Larry M., and Gurdak, Jason J., 2003, Ground-water quality beneath irrigated agriculture in the central High Plains aquifer, 1999-2000: U.S. Geological Survey Water-Resources Investigations Report 03-4219, 39 p. Available Online
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