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Andrew T Leaf

Andrew Leaf is a Hydrologist at the Upper Midwest Water Science Center.


  • 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



  • Mississippi Alluvial Plain (MAP) Regional Water Availability Study
  • FloPy
  • Central Sands Lake Study
  • Coastal Lowlands Aquifer System Regional Groundwater Availability Study
  • rOpen - Open landscape nitrate retention mapping
  • Groundwater-surface water interactions in the Bad River Watershed, Wisconsin.
  • Field investigation of Haskell Lake water balance and subsurface lithology, Lac du Flambeau Reservation, WI.
  • Other project and science support, teaching, and outreach as requested



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)



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 (