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Visual MODFLOW Flex: Plans for 2013

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An exciting year ahead for Visual MODFLOW Flex!

Let me start by wishing you a happy and prosperous New Year! 2012 was an exciting and busy year for the Visual MODFLOW team, and I foresee the same for the year ahead. In 2012, we accomplished several significant milestones with the release of Visual MODFLOW Flex, offering integrated conceptual and numerical modeling, including local grid refinement. Towards the end of the year, we released 2012.2 which provided support for PEST with pilot points, in an easy-to-use workflow environment. In December, we started integrating MT3DMS (contaminant transport) into conceptual and numerical modeling workflows.


The momentum from the end of 2012 has carried forward into the new year, as we are making good progress with support for MT3DMS. Watch for a release of Visual MODFLOW Flex v.2013.1 in early spring! Transport modeling is well-suited for the multi-model, conceptual modeling environment of VMOD Flex, and offers the following benefits:

  • Improved accuracy, reduced run times: Evaluate several numerical grids for transport models; find a reasonable balance between run-times and solution accuracy; easily introduce refined vertical layering on the conceptual model, in order to minimize numerical dispersion. Run several transport realizations in a single project in order to find the most reasonable model.
  • Streamlined uncertainty analysis: Compare concentration results between multiple transport models, including the difference between several runs: ideal for assessing several remediation scenarios.
  • Improved performance: new 64-bit MT3DMS engines allow you to run transport models using larger MODFLOW grids, with millions of cells
  • Reliable QA/QC: Correlate plume locations to observed borehole, monitoring locations, and your geological model.
  • Effective visualization of contaminant concentrations in layer, cross-section, and 3D views, including animation of contaminant plumes.
  • Much more!




Visual MODFLOW Flex viewer showing a combined layer (plan) and 3D view of concentration results
using the classical Airport4 model. Note the convenient color legend on the toolbox and the output
time selection on the toolbar.


Development has already begun on support for MODFLOW-USG in Visual MODFLOW Flex. As mentioned in the August 2012 blog post, the conceptual modeling aspects in Visual MODFLOW Flex are well-suited for defining the grid and inputs for MODFLOW-USG models. The Finite Volume formulation of MODFLOW-USG provides a high level of flexibility in grid geometry, however, an inappropriately defined grid can quickly lead to solution stability and accuracy issues. Fortunately, Visual MODFLOW Flex offers very robust gridding routines, nested grid generation and triangular grid generation, with step-by-step help/guidance for effective and stable grid generation.

Watch for a release in the summer with support for MODFLOW-USG, including the new Connected Linear Network (CLN) package (which supersedes the existing MODFLOW-2005 Conduit Flow Package). The Connected Linear Network can be used to simulate a wide variety of applications, including fractures, horizontal or deviated wells, underground pipes, tunnels, or even streams.

If you are attending the MODFLOW 2013 Conference in June, please visit our booth and the software demo session to see the latest developments. We are also hosting a 1-day workshop on MODFLOW-USG on Sunday, June 2nd, with Sorab Panday (co-author of MODFLOW-USG) as a guest instructor. Don’t miss this opportunity to learn the fundamentals of MODFLOW-USG from the experts! Be sure to contact us if you have any further details.


Nested grids around wells and river boundary condition cells



Sub-layering to account for pinchouts and geological lenses



Exciting Features

In the second half of the year, we will continue integrating the features that you have been requesting including support for surface-water and groundwater models (using UZF, SFR2, and LAK packages), and MODFLOW-SURFACT v.4. If there are other surface water models/packages that you would like us to support, please contact us!


We want to hear from you

If you have suggestions for features that are not mentioned in this article, please contact us via email at support@waterloohydrogeologic.com.

2019-05-21T13:08:00-05:00January 11th, 2013|Categories: Groundwater Modeling, Visual MODFLOW Flex|

About the Author:

Jennifer is the Marketing Communications Specialist for Waterloo Hydrogeologic.