National Water-Quality Assessment (NAWQA) Program
More Information about Modeling
Modeling and Software
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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
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.
Parkhurst, D.L., Christenson, S.C., and Breit, G.N., 1992, Ground-water-quality assessment of the Central Oklahoma aquifer, Oklahoma: Geochemical and geohydrologic investigations: U.S. Geological Survey Open-File Report 92-642, 214 p. Available Online
Frick, E.A., Stell, S.M., and Buell, G.R., 1993, National Water-Quality Assessment Program: A preliminary evaluation of 1990 nutrient loads for the Apalachicola-Chattahoochee-Flint River Basin: Proceedings of the 1993 Georgia Water Resources Conference, April 20-21, 1993 Athens, Georgia, 5 p.
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.
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
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
Frenzel, Steven A., 1996, An application of bioassessment metrics and multivariate techniques to evaluate Central Nebraska streams: U.S. Geological Survey Water-Resources Investigations Report 96-4152, 12 p. Available Online
Litke, David W., 1996, Sources and loads of nutrients in the South Platte River, Colorado and Nebraska, 1994-95: U.S. Geological Survey Water-Resources Investigations Report 96-4029, 31 p. Available Online
Nolan, B.T., and Ruddy, B.C., 1996, Nitrate in ground waters of the United States--Assessing the risk: U.S. Geological Survey Fact Sheet 092-96, 4 p. Available Online
Parkhurst, David L.,Christenson, Scott C., and Breit, George N., 1996, Ground-water-quality assessment of the central Oklahoma Aquifer, Oklahoma; geochemical and geohydrologic investigations: U.S. Geological Survey Water-Supply Paper 2357-C, 101 p. Available Online
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
Volwimkel, E.F., Clawges, R.M., Buxton, D.E., Stedfast, D.A., and Louis, J.B., 1996, Vulnerability of public drinking water supplies in New Jersey to pesticides: U.S. Geological Survey Fact Sheet FS-165-96, 4 p. Available Online
Ashbury, Clyde E., and Oaksford, Edward T., 1997, A comparison of drainage basin nutrient inputs with instream nutrient loads for Seven Rivers in Georgia and Florida, 1986-90: U.S. Geological Survey Water-Resources Investigations Report 97-4006, 8 p. Available Online
Burow, K.R., Weissmann, G.S., Miller, R.D., and Placzek, G., 1997, Hydrogeologic facies characterization of an alluvial fan near Fresno, California, using geophysical techniques: U.S. Geological Survey Open-File Report 97-46, 15 p. Available Online
Erwin, M.L., and Tesoriero, A.J., 1997, Predicting ground-water vulnerability to nitrate in the Puget Sound Basin: U.S. Geological Survey Fact Sheet 061-97, 4 p. Available Online
Lico, Michael S., and Pennington, R. Nyle, 1997, Concentrations, loads, and yields of potentially toxic constituents in irrigation-drain systems, Newlands Project area, Carson Desert, Nevada, Nov. 1994 - Oct. 1995: U.S. Geological Survey Water-Resources Investigations Report 97-4034, 58 p. Available Online
Lizarraga, Joy S., 1997, Estimation and analysis of nutrient and suspended- sediment loads at selected sites in the Potomac River Basin, 1993-95: U.S. Geological Survey Water-Resources Investigations Report 97-4154, 23 p. Available Online
Mueller, David K., Ruddy, Barbara C., and Battaglin, William A., 1997, Logistic model of nitrate in streams of the upper-midwestern United States: Journal of Environmental Quality, vol. 26, no.5, p. 1223-1230. Available Online
Mullaney, John R., and Grady, Stephen J., 1997, Hydrogeology and water quality of a surficial aquifer underlying an urban area, Manchester, Connecticut: U.S. Geological Survey Water-Resources Investigations Report 97-4195, 40 p. Available Online
Nolan, Bernard T., Ruddy, Barbara C., Hitt, Kerie J., and Helsel, Dennis R., 1997, Risk of nitrate in ground waters of the United States-- A national perspective: Environmental Science and Technology, vol. 31, no. 8, p. 229-236. doi: 10.1021/es960818d Available Online
O'Brien, Anne K., 1997, Presence and distribution of trace elements in New Jersey streambed sediments: American Water Resources Association, vol. 33, no. 2, p 387-403. doi: 10.1111/j.1752-1688.1997.tb03518.x Available Online
Smith, Richard A., Schwarz, Gregory E., and Alexander, Richard B., 1997, Regional interpretation of water-quality monitoring data: Water Resources Research, December 1997, vol. 33, no. 12, p. 2781-2798. Available Online
Stackelburg, Paul E., 1997, Presence and distribution of chlorinated organic compounds in streambed sediments, New Jersey: American Water Resources Association, vol. 33, no. 2, p 271-284. doi: 10.1111/j.1752-1688.1997.tb03508.x Available Online
Tesoriero, Anthony J., and Voss, Frank D., 1997, Predicting the probability of elevated nitrate concentrations in the Puget Sound Basin: Implications for aquifer susceptibility and vulnerability: Ground Water, vol. 35, no. 6, November-December 1997, p. 1029-1039. Available Online
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