Jason Gurdak Assistant Professor of Geology, Department of Geosciences

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20. Gurdak, J.J., 2010, The High Plains aquifer (part 2), Prairie Fire, June Issue. (Invited).


19. Gurdak, J.J., 2010, The High Plains aquifer (part 1), Prairie Fire, May Issue.(Invited).


18. Gurdak, J.J., Walvoord, M.A., and McMahon, P.B., 2009. Susceptibility to enhanced chemical migration from depression-focused preferential flow, High Plains aquifer, Vadose Zone Journal, v. 7, no. 4, 1172–1184, doi: 10.2136/vzj2007.0145.


17. Gurdak, J.J., Hanson, R.T., and Green, T.R., 2009. Effects of climate variability and change on groundwater resources of the United States, U.S. Geological Survey Fact Sheet 2009–3074, 4 p.


16. 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.


15. Gurdak, J.J., Qi, S.L., and Geisler, M.L., 2009. Estimating prediction uncertainty from geographical information system raster processing: A user’s manual for the Raster Error Propagation Tool (REPTool), U.S. Geological Survey Techniques and Methods 11–C3, 71p.


14. Gurdak, J.J., and Roe, C.D, Gurdak. J.J., and Roe, C.D, 2009. Recharge rates and chemistry beneath playas of the High Plains aquifer – A literature review and synthesis, U.S. Geological Survey Circular 1333, 39 p.


13. Gurdak, J.J., 2008. Ground-water vulnerability: Nonpoint-source contamination, climate variability, and the High Plains aquifer, VDM Verlag Publishing, Saarbrucken, Germany, ISBN: 978-3-639-09427-5, 223 p.


12. United Nations Educational, Scientific and Cultural Organization (UNESCO) (Gurdak, J.J.is one of 19 contributing authors), 2008. Groundwater resources assessment under the pressures of humanity and climate change (GRAPHIC) – A framework document, GRAPHIC Series N°2, UNESCO Pub., Paris, France, 31 p.


11. McMahon, P. B., K. R. Burow, L. J. Kauffman, S. M. Eberts, J. K. Böhlke, and Gurdak, J.J. 2008. Simulated response of water quality in public supply wells to land use change, Water Resources Research, 44, W00A06, doi:10.1029/2007WR006731,


10.Gurdak, J.J., Hanson, R.T., McMahon, P.B., Bruce, B.W., McCray, J.E., Thyne, G.D., and R.C. Reedy, 2007. Climate variability controls on unsaturated water and chemical movement, High Plains aquifer, USA. Vadose Zone Journal 6(3), 533-547, doi: 10.2136/vzj/2006.0087.


9. 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, 3, 348-361, doi: 10.1111/j.1745-6584.2006.00298.x.

8. 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, USGS Professional Paper 1749, 212 pp.
 Chapter 1. Sources—Quality of recently-recharged water in the High Plains aquifer by Dennehy, K.F.,Gurdak, J.J., McMahon, P.B., Stanton, J.S., and Qi, S.L.
 Chapter 3. Receptors—Quality of the used resource in the High Plains aquifer by Bruce, B.W.,Gurdak, J.J., McMahon, P.B., and Stanton, J.S.
 Chapter 4. Water quality and the future availability of water in the High Plains aquifer by McMahon, P.B., Dennehy, K.F., Bruce, B.W., and Gurdak, J.J.

7. Gurdak, J.J., and Qi, S.L., 2006. Vulnerability of recently recharged ground water in the High Plains regional aquifer to nitrate contamination. USGS Scientific Investigations Report 2006-5050.

6. McMahon, P.B., K.F. Dennehy, B.W. Bruce, J.K. Böhlke, R.L. Michel, Gurdak, J.J., and D.B. Hurlbut. 2006. Storage and transit time of chemicals in thick unsaturated zones under rangeland and irrigated cropland, High Plains, United States. Water Resources Research 42:doi:10.1029/2005WR004417.

5. Qi, S.L., and Gurdak, J.J., 2006. Percentage of probability on nonpoint-source nitrate contamination of recently recharges ground water in the High Plains aquifer; USGS Data Series 192, (PDF).


4. Gurdak, J.J., and McCray, J.E., 2005. Groundwater vulnerability to pesticides: statistical approaches, in Lehr, J.H. and Keeley, J., Water Encyclopedia: Ground Water, John Wiley & Sons, ISBN: 0-471-44164-3, 594–599

3. Bruce, B.W., Becker, M.F. Pope, L.M., and Gurdak, J.J., 2003. Ground-water quality beneath irrigated agriculture in the Central High Plains aquifer, 1999-2000. USGS Water-Resources Invest. Report 03-4219, 39 p.


2. Gurdak, J.J.., Greve, A. I., and Spahr, N. E., 2002. Water-quality data analysis of the Upper Gunnison River Watershed, Colorado, 1989-99. USGS Water-Resources Investigations Report 02-4001, 61 p.


1. Gurdak, J.J., Spahr, N., E., and Smijtzer, R., 2002. Traveltime characteristics of Gore Creek and Black Gore Creek, Upper Colorado River Basin, Colorado, USGS Water-Resources Invest. Report 02-4037, 14 p.




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