National Water-Quality Assessment (NAWQA) Program
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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, v. 43, no. 1, p. 41-59.
Alexander, R.B., Brakebill, J.W., Brew, R.E., and Smith, R.A., 1999, ERF1--Enhanced River Reach File 1.2, U.S. Geological Survey Open-File Report 99-457, Reston, Virginia.
Alexander, Richard B., Elliott, Alexander H., Shankar, Ude, and McBride, Graham B., 2002, Estimating the sources and transport of nutrients in the Waikato River Basin, New Zealand: Water Resources Research 2002 (in press).
Alexander, Richard B., Johnes, Penny J., Boyer, Elizabeth W., and Smith, Richard A., 2002, A comparison of models for estimating the riverine export of nitrogen from large watersheds: Biogeochemistry, vol. 57, no. 58, p. 295- 339.
Alexander, Richard B., Slack, James R., Fitzgerald, A.S., and Schertz, T.L., 1997, Data from selected U.S. Geological Survey national stream water quality monitoring networks: Water Resources Research, vol. 34, no. 9, p. 2401-2405.
Alexander, R.B., Slack, J.R., Ludtke, A.S., Fitzgerald, K.K., and Schertz, T.L., 1997, Data from selected U.S. Geological Survey national stream water- quality monitoring networks (WQN) on CD-ROM: U.S. Geological Survey Fact Sheet FS-013-97, 2 p.
Alexander, R.B., Smith, R.A., Focazio, M.J., and Horn, M.A., 1999, Source-area characteristics of large public surface-water supplies in the conterminous United States: An information resource for source-water assessment, U.S. Geological Survey Open-File Report 99-248.
Alexander, R.B., Smith, R.A., Focazio, M.J., and Horn, M.A., 1999, Source-Area Characteristics of Large Public Surface-Water Supplies in the Conterminous United States: An Information Resource for Source-Water Assessment, U.S. Geological Survey Fact Sheet 160-99, Reston, Virginia.
Alexander, Richard B., Smith, Richard A., and Schwarz, Gregory E., 2000, Effect of stream channel size on the delivery of nitrogen to the Gulf of Mexico: Nature, vol. 403, February 17, 2000, p. 758-761.
Alexander, Richard B., Smith, Richard A., Schwarz, Gregory E., Preston, Stephen D., Brakebill, John W., Srinivasan, Raghavan, and Pacheco, Percy A., 2000, Atmospheric nitrogen flux from the watersheds of major estuaries of the United States: An application of the SPARROW watershed model: American Geophysical Union, p. 119-170.
Brezonik, P.L., Bierman, V.J., Alexander, R., Anderson, J, Barko, J., Dortch, M., Hatch, L., Keeney, D., Mulla, D., Smith, V., Walker, C., Whitledge, T., and W. Wiseman, W., 1999, Effects of reducing nutrient loads to surface waters within the Mississippi River Basin and the Gulf of Mexico, Report of Task Group 4 to the White House Committee on Environment and Natural Resources, Hypoxia Work Group, Federal Register, 64, 23834-23835.
Burkart, M.R., and Stoner, J.D., 2001, Nitrogen in groundwater associated with agricultural systems in Follett, R.F. and Hatfield, J.L., eds., Nitrogen in the Environment: Elsevier, p. 123-145.
Foran, J., Brosnan, T., Connor, M., Delfino, J., DePinto, J., Dickson, K., Humphrey, H., Novotny, V., Smith, R., Sobsey, M., and Stehman, S., 2000, A framework for comprehensive, integrated, watershed monitoring in New York City: Environmental Monitoring and Assessment, 62 (2), p. 147-167.
Frederick, K.D. and Schwarz, G.E., 1999, Socioeconomic Impacts of Climate Change on U.S. Water Supplies, Journal of the American Water Resources Association, 35, 6, 1563-1583.
Gilliom, R.J., Mueller, D.K., and Nowell, L.H., 1998, Methods for comparing water-quality conditions among National Water-Quality Assessment Study Units, 1992-1995: U.S. Geological Survey Open-File Report 97-589, 54 p.
Graffy, E.A., Helsel, D.R., and Mueller, D.K., 1996, Nutrients in the Nation's water: Identifying problems and progress: U.S. Geological Survey Fact Sheet FS-218-96, 6 p.
Hamilton, Pixie A., and Helsel, Dennis, R., 1994, Effects of agricultural activities on ground-water quality in five regions of the United States, [abs.]: Proceedings AWRA 1994 Annual Summer Symposium of the American Water Resources Association, Effects of human-induced change on hydrologic systems, June 26-29, 1994, Jackson Hole, Wyoming, p. 1163.
Helsel, Dennis R., 1995, Nitrate in the Nation's waters [abs.]: A summary of recent studies: Water Resources Update, no. 101, Autumn 1995, p. 12-17.
Hitt, K.J., Ruddy, B.C., and Stoner, J.D., 1999, [abstract] Potential Exposure of the Nation's waters to animal manure: Workshop abstracts-Animal feeding operations: Effects on hydrologic resources and the environment, August 30 - September 1, 1999, Ft. Collins, Colorado, U.S. Geological Survey Open-File Report 00-024, 107 p.
Hughes, W.B., E.J. Reuber, and L.J. Puckett, Fate of nitrogen in ground water in a coastal plain agricultural setting, Orangeburg County, South Carolina, South Carolina Water-Quality Conference, 1999.
Kolpin, Dana, Hallberg, George, Sneck-Fahrer, Debra, and Libra, Robert, 1997, Agricultural chemicals in Iowa's ground water, 1982-95¾What are the trends? U.S. Geological Survey Fact Sheet FS-116-97, 4 p.
Mueller, D.K., 1998, Quality of nutrient data from streams and ground water sampled during 1993-95¾National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 98-276, 25 p.
Mueller, D.K., and Stoner, J.D., 1998, Identifying the potential for nitrate contamination of streams in agricultural areas of the United States in Proceedings of the National Water-Quality Monitoring Conference, July 7-9, 1998, Reno, Nev., p. III-163 to III-173.
Mueller, D.K., Hamilton, P.A., Helsel, D.R., Hitt, K.J., and Ruddy, B.C., 1995, Nutrients in ground water and surface water of the United States¾Analysis of data through 1992: U.S. Geological Survey Water-Resources Investigations Report 95-4031, 74 p.
Mueller, D.K., Martin, J.D., and Lopes, T.J., 1997, Quality-control design for surface-water sampling in the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 7-223, 17 p.
Mueller, D.K., Ruddy, B.C., and Battaglin, W.A., 1993, Relation of nitrate concentrations in surface water to land use in the upper- midwestern United States, 1989-1990, in Goolsby, D.A., Boyer, L.L., and Mallard, G.E., compilers, Selected papers on agricultural chemicals in water resources of the midcontinental United States: U.S. Geological Survey Open-File Report 93-418, p. 41-50.
Mueller, D.K., Ruddy, B.C., and Battaglin, W.A., 1994, Nitrate and atrazine in surface waters of the Upper-Midwestern United States: An example of regional synthesis, [abs.], in Sorenson, Stephen K., ed., 1994, Proceedings abstracts American Water Resources Association's symposium on the National Water-Quality Assessment Program--November 7-9, 1994, Chicago, Illinois: U.S. Geological Survey Open-File Report 94-397, p. 7.
Mueller, D.K., Ruddy, B.C., and Battaglin, W.A., 1997, Logistic model of nitrate in streams of the upper-midwestern United States: Journal of Environmental Quality, v. 26, no. 5, p. 1223-1230.
Munn, Mark D., and Hamilton, Pixie A., 2003, Effects of nutrient enrichment on stream ecosystems--New studies initiated by the U.S. Geological Survey: Briefing materials prepared for the Ecological Society of America Annual Meeting, Savannah, Georgia, August 2003, 4 p.
Munn, Mark D., and Hamilton, Pixie A., 2003, New studies initiated by the U.S. Geological Survey--Effects of nutrient enrichment on stream ecosystems-- U.S. Geological Survey Fact Sheet 03-118
Nolan, B.T., 1998, Modeling approaches for assessing risk of non-point contamination of ground water: U.S. Geological Survey Open-File Report 98-531, 22 p.
Nolan, Bernard T., 2005, Moving from monitoring to prediction - national assessment of nitrate in ground water: Handout for a Congressional Briefing in Washington, D.C., March 11, 2005, sponsored by the Water Enviornment Federation, Environmental and Energy Study Institute, and USGS, 4 p.
Nolan, B.T., Ruddy, B.C., Hitt, K.J., and Helsel, D.R., 1997, Nitrate contamination of ground waters in the United States¾Evaluating the risk: U.S. Geological Survey poster.
Nolan, B.T., Ruddy, B.C., Hitt, K.J., and Helsel, D.R., 1998, Risk of nitrate contamination in groundwaters of the United States-A national perspective, version 2.0.
Nolan, B.T., Ruddy, B.C., Hitt, K.J., and Helsel, D.R., 1998, Nitrate in ground waters of the United States. in Proceedings of the National Water-Quality Monitoring Conference, July 7-9, 1998, Reno, Nev.
Puckett, L.J., 1994, Estimates of Nonpoint- and point source loadings of nutrients in NAWQA basins: What can they tell us? [abs.], in Sorenson, Stephen K., ed., 1994, Proceedings abstracts American Water Resources Association's symposium on the National Water-Quality Assessment Program- -November 7-9, 1994, Chicago, Illinois: U.S. Geological Survey Open-File Report 94-397, p. 6.
Puckett, L.J., 1994, Nonpoint-and point-source contributions of nitrogen and phosphorus in large watersheds, [abs.]: American Geophysical Union 1994 Fall Meeting, December 5-9, 1994, San Francisco, California, p. 228.
Puckett, L.J, 1995, Identifying the major sources of nutrient water pollution: Environmental Science and Technology, v. 29, n. 9, p. 408-414A.
Puckett, L.J., 1999, The effectiveness of riparian buffer zones for removing nitrate from groundwater discharging to Atlantic Coastal Plain streams, Sixth Symposium on Biogeochemistry of Wetlands, 1999.
Puckett, L.J., and Triska, F.J., editors, 1996, U.S. Geological Survey nitrogen cycling workshop, Denver, Colo., October 30 - November 2, 1995: U.S. Geological Survey Open-File Report 96-477, 88 p.
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, p. 147-181.
Smith, R.A. and Alexander, R.B., 2000, Sources of nutrients in the Nation's watersheds, Proceedings of the National Resource, Agriculture, and Engineering Service, A conference for nutrient management consultants, extension educators, and producer advisors, March 28-30, 2000, Camp Hill, Pennsylvania.
Smith, Richard A., Alexander, Richard B., Tasker, Gary D., Price, Curtis V., Robinson, Keith W., White, Dale A., 1993, Statistical modeling of water quality in regional watersheds: Watershed '93, p. 751-754.
Smith, R.A., Schwarz, G.E., and Alexander, R.B., 1997, Regional interpretation of water-quality data: Water resources Research, Vol. 33, No. 12, p. 2781-2798.
Sorenson, S.K., Porter, S.D., Akers, K.K.B, Harris, M.A., Kalkhoff, S.J., Lee, K.E., Roberts, L.R., and Terrio, P.J., 1999, Water quality and habitat conditions in Upper Midwest streams relative to riparian vegetation and soil characteristics, August 1997: Study design, methods and data: U.S. Geological Survey Open-File Report 99-202, 53 p.
Squillace, Paul J., Scott, Jonathon, Moran, Michael J., Nolan, B.T., and Kolpin, Dana W., 2002, VOCs, pesticides, nitrate, and their mixtures in groundwater used for drinking water in the United States: Environmental Science & Technology, vol. 36, no. 9, p. 1923-1930.
Stoner, J.D., and Goolsby, D.A., 1999, [abstract], Stream nutrients findings from national and regional water-quality assessments: U.S. Department of Agriculture Workshop-"Agricultural and Coastal Resources: Issues in Measuring the Economic Dimensions of Problems and Policies," Washington DC, June 3, 1999.
Tornes, L.H., Puckett, L.J., Stoner, J.D., and Brigham, M.E., 1994, The effect of riparian wetlands in reducing nitrate-nitrogen from a sand and gravel aquifer to a stream, [abs.] poster: American Geophysical Union 1994 Fall Meeting, December 5-9, 1994, San Francisco, California, p. 261.
Wilber, William G., and Davis, Jerri V., 1994, Assessing the quality of the Nation's water¾Point versus nonpoint sources of phosphorus in rivers: U.S. Geological Survey Yearbook, Fiscal Year 1993, p. 48-49.