John Walker
Research Hydrologist
U.S. Geological Survey
Wisconsin Water Science Center
8505 Research Way
Middleton, Wisconsin 53562
Phone: 608-821-3853
Fax: 608-821-3817
Email: jfwalker@usgs.gov
Education
- Ph.D. Hydrology, University of Wisconsin-Madison, 1985
- M.S. Hydrology, University of Wisconsin-Madison, 1981
- B.S. Civil Engineering, University of Wisconsin-Madison, 1979
Areas of Expertise
- Ground-water/surface-water interactions, including hydrology and geochemistry;
- flood frequency analysis and prediction;
- assessing the effectiveness of nonpoint best-management practices;
- hydraulics of flow under ice;
- optimization of ground-water systems
Current Projects
Experience
- Research Hydrologist, U.S. Geological Survey, Wisconsin Water Science Center, March 1985-present
- Adjunct Professor of Civil and Environmental Engineering, University of Wisconsin, September 2000–present
- Lecturer, Department of Civil and Environmental Engineering, University of Wisconsin-Madison, September 1983-May 1984
Selected Publications
USGS series publications
Fitzpatrick, F.A.; Peppler, M.C.; Walker, J.F.; Rose, W.J., Waschbusch, R.J., and Kennedy, J.L., 2008, Flood of June 2008 in southern Wisconsin: U.S. Geological Survey Scientific Investigations Report 2008–5235, 24 p.
Corsi, S.R., Walker, J.F., Wang, Lizhu, Horwatich, J.A., and Bannerman, R.T., Effects of best-management practices in Otter Creek in the Sheboygan River Priority Watershed, Wisconsin, 1990–2002: U.S. Geological Survey Scientific Investigations Report 2005–5009.
Walker, J.F., and Hughes, P.E., 2005, Bridge scour monitoring at three sites in Wisconsin: U.S. Geological Survey Open-File Report 2005-1374, 14 p.
Graczyk, D.J., Walker, J.F., Horwatich, J.A., and Bannerman, R.T., 2003, Effects of best-management practices in the Black Earth Creek priority watershed,Wisconsin, 1984–98: U.S. Geological Survey Water-Resources Investigations Report 03–4163, 24 p.
Walker, J.F., and Krug, W.R., 2003, Flood-Frequency Characteristics of Wisconsin Streams: U.S. Geological Survey Water-Resources Investigations Report 03-4250, 37 p.
Walker, J.F., Graczyk, D.J., Corsi, S.R., Wierl, J.A., Owens, D.W., 2001, Evaluation of Nonpoint-Source Contamination, Wisconsin: Water Year 1999. U.S. Geological Survey Open-File Report 01-105, 37 p.
Walker, J.F., and Bullen, T.D., 2000, Trout Lake, Wisconsin: A water, energy and biogeochemical budgets program site: U.S. Geological Survey Fact Sheet 161-99, 4 p.
Walker, J.F., Saad, D.A., and Krohelski, J.T., 1998, Optimization of ground-water withdrawal in the Lower Fox River Communities, Wisconsin: U.S. Geological Survey Water-Resources Investigations Report 97-4218, 24 p.
Corsi, S.R., Walker, J.F., Graczyk, D.J., Greb, S.R., Owens, D.W., and Rappold, K.F., 1995, Evaluation of nonpoint-source contamination, Wisconsin: Selected streamwater-quality data, land-use and best-management practices inventory, and quality assurance and quality control, Water year 1993. U.S. Geological Survey Open-File Report 94-707-W, 57 P.
Walker, J.F., Graczyk, D.J., Corsi, S.R., Owens, D.W., and Wierl, J.A., 1995, Evaluation of nonpoint-source contamination, Wisconsin; land-use and best-management-practices inventory, selected streamwater-quality data, urban-watershed quality assurance and quality control, constituent loads in rural streams, and snowmelt-runoff analysis, water year 1994: U.S. Geological Survey Open-File Report 95-320, 21 p.
Graczyk, D.J., Walker, J.F., Greb, S.R., Corsi, S.R., Owens, D.W., 1993, Evaluation of Nonpoint-Source Contamination, Wisconsin: Selected Data for 1992 Water Year, U.S. Geological Survey Open-File Report 93-630, 48 p.
Walker, J.F., 1993, Techniques for detecting effects of urban and rural land-use practices on stream-water chemistry in selected watersheds in Texas, Minnesota, and Illinois: U.S. Geological Survey Open-File Report 93-130, 16 p.
Elder, J.F., Krabbenhoft, D.P., and Walker, J.F., 1992, Water, energy, and biogeochemical budgets (WEBB) program: data availability and research at the northern temperate lakes site, Wisconsin: U.S. Geological Survey Open-File Report 92-48,15 p.
Melcher, N.B., and Walker, J.F., 1992, Evaluation of selected methods for determining streamflow during periods of ice effect: U.S. Geological Survey Water-Supply Paper 2378, 47 p.
Melcher, N.B., and Walker, J.F., 1990, Evaluation of selected methods for determining streamflow during periods of ice effect: U.S. Geological Survey Open-File Report 90-554, 58 p. [Superseded by WSP 2378]
Walker, J.F., Osen, L.L., and Hughes, P.E., 1987, Cost effectiveness of the U.S. Geological Survey's stream-gaging program in Wisconsin: U.S. Geological Survey Water-Resources Investigations Report 86-4125, 44 p.
Journal articles, reports, and other publications
Shanley, J.B., Mast, M.A., Campbell, D.H., Aiken, G.R., Krabbenhoft, D.P., Hunt, R.J., Walker, J.F., Schuster, P.F., Chalmers, A., Aulenbach, B.T., Peters, N.E., Marvin-DiPasquale, M., Clow, D.W., and Shafer, M.M., 2008, Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach: Environmental Pollution, v. 154, no. 1, p. 143-154.
Hunt, R.J., Prudic, D.E., Walker, J.F., and Anderson, M.P., 2008, Importance of unsaturated zone flow for simulating recharge in a humid climate: Ground Water, v. 46, no. 4, p. 551-560. doi:10.1111/j.1745-6584.2007.00427.x
Hunt, R.J., Walker, J.F., and Doherty, J., 2008, Using GSFLOW to simulate climate change in a northern temperate climate, p. 109-113 in MODFLOW and More 2008: Ground water and public policy, Proceedings of the 9th International Conference of the International Ground Water Modeling Center. Golden, CO: Colorado School of Mines.
Lowry, C.S., Walker, J.F., Hunt, R.J., and Anderson, M.P., 2007, Identifying spatial variability of groundwater discharge in a wetland stream using a distributed temperature sensor: Water Resources Research, v. 43, W10408, http://www.agu.org/pubs/crossref/2007/2007WR006145.shtml.
Walker, J. F., D. A. Saad, and R. J. Hunt, 2007, Dynamics of CFCs in northern temperate lakes and adjacent groundwater: Water Resources Research, v. 43, W04423, doi:10.1029/2005WR004647
Peters, N.E., Shanley, J.B., Aulenback, B.T., Webb, R.M., Campbell, D.H., Hunt, R.J., Larsen, M.C., Stallard, R.F., Troester, J., and Walker, J.W., 2006, Water and solute mass balance of five small, relatively undisturbed watersheds in the U.S.: Science of the Total Environment, v. 358, p. 221-242. doi:10.1016/j.scitotenv.2005.04.044
Hunt, R.J., Strand, M., and Walker, J.F., 2006, Measuring groundwater-surface water interaction and its effect on wetland stream benthic productivity, Trout Lake watershed, northern Wisconsin, USA: Journal of Hydrology v. 320, no. 3-4, p. 370-384. doi:10.1016/j.jhydrol.2005.07.029
Walker, J.F., Hunt, R.J., Bullen, T.D., Krabbenhoft, D.P., Kendall, C., 2003, Spatial and temporal variability of isotope and major ion chemistry in the Allequash Creek basin, northern Wisconsin: Ground Water, Special small watersheds issue, v. 41, no. 7, p. 883-894. doi:10.1111/j.1745-6584.2003.tb02431.x
Corsi, S.R., Walker, J.F., Waschbusch, R.J., and Standridge, J., 2003, Sources and Variability of Cryptosporidium in the Milwaukee River Watershed: Water Environment Research Foundation 99-HHE-2, 114 p.
Hunt, R.J., Walker, J.F., and Krabbenhoft, D.P., 1999, Characterizing hydrology and the importance of ground-water discharge in natural and constructed wetlands: Wetlands, v. 19, no. 2, p. 458-472.
Walker, J.F., and Krabbenhoft, D.P., 1998, Groundwater and surface-water interactions in riparian and lake-dominated systems, in McDonnell, J.J., and Kendall, C., eds., Isotope tracers in catchment hydrology: Amsterdam, The Netherlands, Elsevier, p. 467-488.
Walker, J.F., and Wang, D., 1997, Measurement of flow under ice covers in North America: Journal of Hydraulic Engineering, v. 123, no. 11, p. 1037-1040.
Teal, M.J., Ettema, R., and Walker, J.F., 1994, Estimation of mean flow velocity in ice-covered channels: Journal of Hydraulic Engineering, v. 120, no. 12, p. 1385-1400.
Walker, J.F., 1994, Statistical techniques for assessing water-quality effects of BMPs: Journal of Irrigation and Drainage Engineering, v. 120, no. 2, p. 334-347.
Walker, J.F., 1994, Methods of measuring discharge under an ice cover: Journal of Hydraulic Engineering, v. 120, no. 11, p. 1327-1336.
Walker, J.F., 1994, Analysis of velocity profiles under a solid ice cover, in River Ice Seminar, Minneapolis, Minnesota, National Weather Service, p. 93-95.
Walker, J.F. and Graczyk, D.J., 1993, Preliminary Evaluation of Effects of Best Management Practices in the Black Earth Creek, Wisconsin, Priority Watershed, Water Science Technology, Vol. 28 No. 3-5: 539-548
Walker, J.F., 1991, Accuracy of selected techniques for estimating ice-affected streamflow, v. 117, no. 6, p. 697-712.
Hirsch, R.M., Walker, J.F., Day, J.C., and Kallio, R., 1990, Chapter 13: The influence of man on hydrologic systems, in Wolman, M.G., and Riggs, H.C., eds., Surface water hydrology: Boulder, CO, Geological Society of America, The Geology of North America, v. O-1, p. 329-359.
Walker, J.F., Pickard, S.A., and Sonzogni, W.C., 1989, Spreadsheet watershed modeling for nonpoint-source pollution management in a Wisconsin basin, v. 25, no. 1, p. 139-147.
Walker, J.F., 1988, General two-point method for determining velocity in open channel, v. 114, no. 7, p. 801-805.
Potter, K.W., and Walker, J.F., 1985, An empirical study of flood measurement error, v. 21, no. 3, p. 403-406.
Walker, J.F., 1985, The impact of measurement error on the at-site flood frequency problem: Madison, WI, University of Wisconsin, Ph.D., 207 p.
Potter, K.W., and Walker, J.F., 1982, Modeling the error in flood discharge measurements, in Shaarawi, A.H., and Esterby, S.W., eds., Developments in Water Science, Volume 17, Time Series Methods in Hydroscience, p. 405-413.
Potter, K.W., and Walker, J.F., 1981, A model of discontinuous measurement error and its effects on the probability distribution of flood discharge measurements, v. 17, no. 5, p. 1505-1509.
Walker, J.F., 1981, The impact of measurement error on the probability distribution of measureed flood discharges: Madison, WI, University of Wisconsin, M.S., 95 p.
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