June 5 –
June 6, 2026

INSTRUCTORS

• Wes Bonelli, University Corporation for Atmospheric Research
• Joseph Hughes, INTERA
• Chris Langevin, S.S. Papadopulos & Associates
• Josh Larsen, US Geological Survey
• Sorab Panday, GSI Environmental Inc.
• Alden Provost, US Geological Survey
• Michael Reno, University Corporation for Atmospheric Research
• Martijn Russcher, Deltares

DESCRIPTION

MODFLOW 6 is the current version of MODFLOW released and supported by the USGS. The program is under active development by the short course instructors and the broader hydrologic community. This short course introduces participants to MODFLOW 6 and its growing simulation capabilities. For each topic included in the short course, there will be a short lecture on the underlying concepts and implementation followed by a live demonstration. Live demonstrations will use the Python language, Jupyter Notebooks, and the FloPy Package to create, run, and post-process MODFLOW 6 simulations.

The following topics will be covered during the short course:

• Getting started with MODFLOW 6 and FloPy
• XT3D multi-point flux approximation for modeling aquifers on unstructured grids and/or with full three-dimensional anisotrophy
• Structured and unstructured discretization strategies (quadtree, triangular, and voronoi meshes, and local grid refinement)
• Advanced packages (Multi-Aquifer Well, Streamflow Routing, Lake, Unsaturated Zone Flow, Water Mover, and Compaction and SUBsidence)
• Constant and variable-density flow, and solute and heat transport
• Particle tracking
• Setting up and running parallel MODFLOW 6 simulations on laptops, desktops, and supercomputers
• Using the MODFLOW Application Programming Interface (API) to couple with other models, create custom MODFLOW packages, and control MODFLOW during a simulation
• Current and future directions for MODFLOW 6 development

AUDIENCE

This course is suited for groundwater modelers interested in learning about the USGS version of MODFLOW, its newer capabilities, and how to use FloPy to create and run simulations. For attendees wanting to run live demonstrations, instructions for installing the required software on a laptop computer (Windows, Mac, and Linux operating systems will be supported) will be provided in advance of the course. No previous experience with FloPy or Python is required, however, participants without any Python experience may benefit from additional preparation prior to the class.

PRICE

$300 ($350 after May 6); student $150. This fee covers instruction, refreshments, and any course materials. Lodging and meals are not covered. Payment in full must be received prior to the beginning of the course in order to participate.

If cancellation is made before May 6, 2026 full registration fee will be refunded. Cancellations made after that date will receive a full refund minus a $25 deposit. In case of cancellation, the right to course materials is forfeited. Substitutions are permitted any time prior to the start of the course. Please be advised that if the course is canceled due to insufficient enrollment, all course fees will be refunded, but the IGWMC will not be liable for any other expenses incurred by prospective attendees.

REGISTER

Registration is open at: https://event.fourwaves.com/gmm26/registration

June 11,
2026

INSTRUCTORS

• Vivek Bedekar, S.S. Papadopulos & Associates
• Christopher Neville, S.S. Papadopulos & Associates

COURSE OBJECTIVE

This course aims to teach attendees the underlying theoretical concepts and provide a modeling toolkit for simulating groundwater solute transport to address practical contamination and remediation problems. The course is structured as a one-day course and consists of theory, practical examples, and demonstration examples to address practical problems.

DESCRIPTION

This one-day course provides a practical and structured overview of solute transport modeling in groundwater, integrating both fundamental theory and applied techniques. The morning sessions focus on core transport processes – advection, dispersion, and simple chemical reactions – followed by an introduction to analytical modeling approaches using tools like ATRANS and SSM. Nonideal trtansport is introduced through the MPNE framework (dual-domain and rate-limited sorption). The transition to numerical modeling highlights key issues such as numerical dispersion, stability, and convergence, while also introducing more complex processes, including kinetic reactions.

Afternoon sessions, shift toward advanced applications, including pump-and-treat design, groundwater-surface water exchange, and variable-density and heat transport. Reactive transport modeling is introduced, along with a special focus on PFAS simulation challenges. The course wraps up with special topics like the unit concentration approach and groundwater age modeling, illustrated through practical examples that emphasize model conceptualization, calibration, and decision-making. The day concludes with an open discussion and Q&A to reinforce learning and address participant-specific questions.

AUDIENCE

The course is intended for students and professionals familiar with groundwater flow concepts who are interested in simulating the fate and transport of contaminants in groundwater.

PRICE

$350 ($400 after May 6); student $250. This fee covers instruction, refreshments, and any course materials. Lodging and meals are not covered. Payment in full must be received prior to the beginning of the course in order to participate.

If cancellation is made before May 6, 2026 full registration fee will be refunded. Cancellations made after that date will receive a full refund minus a $25 deposit. In case of cancellation, the right to course materials is forfeited. Substitutions are permitted any time prior to the start of the course. Please be advised that if the course is canceled due to insufficient enrollment, all course fees will be refunded, but the IGWMC will not be liable for any other expenses incurred by prospective attendees.

REGISTER

Registration is open at: https://event.fourwaves.com/gmm26/registration

September 30 –
October 4, 2024

The Geochemical Modeling: PHREEQC and Beyond Conference and Course provides an opportunity to learn about best practices and innovative projects using PHREEQC, a powerful reaction/transport modeling tool developed by the U.S. Geological Survey and used by water agencies and consultants to perform aqueous geochemical calculations. This event offers presentations by industry leaders, networking opportunities with water purveyors and regulatory agencies, and the opportunity to expand your knowledge and capabilities using PHREEQC. Tony Appelo and David Parkhurst, the founders of PHREEQC, will be keynote speakers and teach the Course. Visit the event website for details and to register, at: https://www.geochemicalmodeling.com

March 3 – 4,
2024

The 10th International Groundwater Conference will be held March 5-7 in Roorkee, India, with the theme of “Groundwater Vision 2047: Towards Water Security under Changing Climate.” Vivek Bedekar, PhD, PE, of S.S. Papadopulos & Associates, will instruct a 2-day pre-conference course on March 3-4 to teach theoretical concepts and provide a modeling toolkit for simulating groundwater solute transport to address contamination problems. The course includes theory, practical examples, and hands-on training.

Day 1

• Session 1: Underlying definitions – Advection, Dispersion, Porosity; Governing equation; Numerical solutions and related issues.
• Session 2: Adsorption, decay, mass calculations; Dual porosity; Reactions – zero/first order decay, instantaneous kinetics.
• Session 3: Analytical models – approximations and solutions; ATRANS, MPNE1D, SSM.
• Session 4: Numerical models – MT3D-USGS examples.

Day 2

• Session 1: Advanced topics in MT3D-USGS; Groundwater-surface water transport; Pump and treat system.
• Session 2: MODFLOW 6 examples; Variable density modeling; Heat transport, axisymmetric modeling.
• Session 3: Vadose zone transport, dual porosity transport; PFAS background and introduction.
• Session 4: Geochemical modeling; Practical examples; Conceptualization, calibration, Q&A.

Visit the IGWC 2025 website for more information and to register, at: https://igwc2025.nihroorkee.gov.in/index