U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Advances in Modeling Groundwater Flow and Transport with MODFLOW

Sponsored by: USGS and US EPA

Archived: Wednesday, February 3, 2021
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MODFLOW is a popular open-source groundwater modeling software program developed, supported, and maintained by the U.S. Geological Survey. The MODFLOW program, first released over 35 years ago, has evolved into rich suite of software programs for the simulation of groundwater flow, solute transport, and a wide range of other groundwater related processes. In 2017, the U.S. Geological Survey released a new core version of the MODFLOW program. This new version, called MODFLOW 6 (the sixth core version), extends the core MODFLOW capabilities to include robust solutions for complex water table problems, support for generalized meshes with focused resolution within areas of interest, and support for multiple models and multiple types of models within the same simulation. In addition to the Groundwater Flow Model, MODFLOW 6 now contains a Groundwater Transport Model, which can run simultaneously with the flow model or as a separate simulation using the results from a previous groundwater flow simulation. The purpose of this presentation is to describe the MODFLOW suite of programs and highlight some of the new capabilities currently available and under development for MODFLOW 6.

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A photograph of Christian Langevin, Ph.D.Christian Langevin, Ph.D., USGS (
Dr. Christian Langevin is a research hydrologist with the U.S. Geological Survey Earth Systems Modeling Branch. Dr. Langevin is the USGS caretaker for the MODFLOW program, which is used worldwide to simulate groundwater processes. His present work focuses on development and support of MODFLOW and other related programs, such as FloPy, SEAWAT, and MT3D-USGS. Dr. Langevin has over 30 years of experience modeling groundwater flow, solute and heat transport, and coastal groundwater issues, such as saltwater intrusion, submarine groundwater discharge, deep-well injection, aquifer storage and recovery, and coastal wetland dynamics.


A photograph of Michael AdamMichael Adam, U.S. EPA Technology Innovation and Field Services Division ( or 703-603-9915)
As a Triad advocate, Mike directed the final production of the Management and Interpretation of Data Under a Triad Approach. For the Technology Innovation Program (TIP), Mike serves as POC for various issues and initiatives such as Vapor Intrusion, Decision Support Tools, and the Measurement and Monitoring Technologies for the 21st Century initiative; and is part of the CLUIN management team. Mike has graduate degrees in Plant Physiology (2000, Iowa State) and Environmental Engineering (2003, Nebraska-Lincoln), and was a staff Research Assistant in Environmental Soil Science at Nebraska-Lincoln before joining the Technology Innovation Program at the EPA in late 2004.

Sophia Lee, PG, Naval Facilities Engineering and Expeditionary Warfare Center (
Sophia Lee is a project manager and hydrogeologist for the Navy Facilities Engineering Command's Expeditionary Warfare Center (NAVFAC EXWC). While only recently joining the NAVFAC family, she previously spent 8 years working as a consultant in Denver and Boulder, CO. Her experience in the design, construction, and calibration of both regional and site-specific MODFLOW models has helped her to develop the opinion that when it comes to modeling, the "Less is More" philosophy is usually apt for assessing most groundwater problems. In addition to groundwater modeling, Ms. Lee has also been involved in well installation and aquifer testing of groundwater wells for both remote and urban environments. Ms. Lee received her undergraduate degrees in Geology and Classical and Near Eastern Archaeology from Bryn Mawr College and her Master's in Hydrological Sciences and Engineers from the Colorado School of Mines. She is currently a member of the Environmental Restoration team and supports groundwater remediation and supply projects for the Navy throughout the world.

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