Walt Mcnab
Computational Environmental Scientist And Hydrogeologist
Concord, California, United States
Summary
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Senior🎓
Top SchoolWalt Mcnab is a computational environmental scientist and hydrogeologist with over 25 years of research and consulting experience, currently working as a semi-retired consultant from Concord, CA. He specializes in quantitative analysis and numerical modeling of flow, transport, and geochemical processes in groundwater and the vadose zone, routinely using Python, Julia, R and public-domain tools like MODFLOW, HYDRUS, and PHREEQC. His projects span groundwater banking, wastewater pond infiltration, contamination forensics, and multiphase reactive transport, often combining machine learning, Monte Carlo uncertainty analysis, and custom simulation code to inform decisions and litigation. A published researcher with deep national-lab experience, he has applied his models to large-scale problems including CO2 storage and subsurface radionuclide migration. Less obvious: he maintains an active GitHub and technical blog with unstructured-grid and two-phase flow models that showcase his habit of turning research-grade code into practical tools for clients.
10 years of coding experience
20 years of employment as a software developer
Ph.D., Hydrogeology, Ph.D., Hydrogeology at University of California, BerkeleyCalifornia High SchoolGithub contributions (5)
NumericalEnvironmental/Partially_saturated_groundwater_flow_model_in_julia
Oct 2018 - Apr 2021
Contributions:10 commits, 9 pushes, 1 branch in 2 years 5 months
NumericalEnvironmental/Coupled_gas_water_flow_and_transport_porous_media
Jan 2017 - May 2017
Contributions:8 commits, 7 pushes, 1 branch in 4 months
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