Andrew T Leaf



M.S., Hydrogeology - University of Wisconsin-Madison, 2010

M.S., Water Resources Management - University of Wisconsin-Madison, 2010

B.A., Geology and History - Gustavus Adolphus College, 2005  



2012 - present  Hydrologist, U.S. Geological Survey Upper Midwest Water Science Center

2010 - 2012      Hydrogeologist, SoundEarth Strategies, Inc., Seattle, WA

2007 - 2010      Research/Teaching Assistant, University of Wisconsin-Madison, Dept. of Geoscience



  • groundwater flow modeling
  • simulation of groundwater-surface water interactions
  • model calibration / parameter estimation
  • application of GIS and the python programming language to hydrologic modeling and data analysis
  • distributed temperature sensing





Reviewer for Groundwater, Water Resources Research, Geophysical Research Letters, Environmental Modeling and Software and various USGS publications.

2016 to present - Member, State of Wisconsin Groundwater Coordinating Council Research and Monitoring Subcommittee

2015 to present - American Water Resources Association Wisconsin Section Board (President Elect)



Leaf, A.; Breaker, B.; Adams, R.; Dietsch, B., 2018. Improving Numerical Simulation of Streams and Shallow Groundwater in the Mississippi Alluvial Plain, Mississippi Water Resources Conference, Jackson, MS, April 3-4.

Leaf, A.T., 2018. A Field Investigation of a Small Drainage Lake and Contamination Plume in Northern Wisconsin, AWRA – Wisconsin Section Annual Meeting, Appleton, WI, March 8-9.

Leaf, Andrew T., Hunt, R.J., Christiansen, D.E., and Haj, A.E., 2017, Promise and peril of calibrating a high resolution gridded regional watershed model, MODFLOW and More conference, Golden, CO, May 21-24, 2017.

Leaf, Andrew T., Fienen, M.N, White, J.T. and Hunt, R.J., 2017, Data worth analysis for optimizing data collection for groundwater models, Minnesota Groundwater Association Spring Conference, Minneapolis, MN, April 26.

Leaf, A.T., 2017, A Distributed Temperature Sensing Investigation to Inform Lakebed Pore-Water Sampling. AWRA – Wisconsin Section Annual Meeting, Elkhart Lake, WI, March 9-10.

Leaf, A.T., 2015, A program for rapidly building groundwater flow models. AWRA – Wisconsin Section Annual Meeting, Oconomowoc, WI, March 5-6.

Leaf, A.T., Gotkowitz, M.B. and Dunning, C.P., A groundwater flow model for Columbia County, Wisconsin. AWRA – Wisconsin Section Annual Meeting, Brookfield, WI, March 7-8, 2014.

Leaf, A.T., Hunt, R.J. and Fienen, M.N., Teaching concepts of non-uniqueness and uncertainty in groundwater. GSA Annual Meeting, Denver, CO. October 27-30, 2013.

Leaf, A.T., Fienen, M.N. and Hunt, R.J., Prediction uncertainty analysis to inform additional data collection. MODFLOW and More conference, Golden, CO, June 3-5, 2013.

Leaf, A.T., M.N. Fienen, and R.J. Hunt, Simulation of groundwater flow and groundwater/surface water interactions in the Bad River Watershed, Wisconsin, AWRA – Wisconsin Section Annual Meeting, Brookfield, WI, March 7-8, 2013.

Leaf, A.T., Hart, D.J. and Bahr, J.M., Single-well thermal tracer tests using distributed temperature sensing, GSA Annual Meeting, Denver, CO, October 31-November 3, 2010.

Leaf, A.T. and J.M. Bahr, Water quality changes during aquifer storage recovery in the Cambrian-Ordovician Aquifer, Oak Creek, WI, GSA Annual Meeting, Houston, TX, October 5-9, 2008. (Co-winner, Best Student Paper)



GW1774-Introduction to Python for Hydrologic Modeling - USGS course given to government and academic professionals, Feb 26-Mar 2, 2018, Lakewood, CO, Co-instructors: M.N. Fienen, J. D. Hughes, and C.D Langevin; April 4-8, 2016 Madison, WI. Co-instructors: M.N. Fienen and J. D. Hughes

General Python course given to DOI scientists at the California Volcano Observatory, Menlo Park, CA, July 25-28, 2017. Co-instructor: M.N. Fienen

Geospatial Python course given to DOI scientists at the Upper Midwest Environmental Science Center in La Crosse, WI, Nov. 15-17, 2017. Co-instructor: M.N. Fienen

Understanding and Evaluating Groundwater Flow Models course given to EPA and tribal environmental staff, March 8-9, 2015, Fond du Lac, MN and April 6-8, Chicago, IL. Co-instructors: D.T. Feinstein and R.J. Hunt.



Contributor to FloPy, SFRmaker and other open-source software projects for improving the quality, reproducibility and efficiency of hydrologic models (