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Visual MODFLOW (VMOD) Flex is a powerful software package that provides the tools for building three-dimensional groundwater conceptual and numerical models using raw GIS data objects. The conceptual model approach to groundwater modeling allows you to:

Build a conceptual model of the groundwater system, prior to the simulation - Geologic formation structures, hydrogeologic properties, and  boundary conditions are all designed outside the model grid or mesh; this allows the flexibility to adjust your interpretation of the groundwater system before applying a discretization method and converting to a numerical model.

Build the model with minimal data pre-processing required - Working with grid-independent data allows you to maximize the use of your existing GIS data and incorporate physical geology and geographic conditions before designing a grid or mesh.

Generate and simulate regional and local-scaled models - With support for MODFLOW-LGR, you can design local grids around areas of interest, directly within the conceptual model environment. Calculated heads from a regional model can also be used as boundary conditions for local-scaled models.

Design the correct model faster - The grid-independent raw data is left intact and is not constricted by grid cells or mesh elements when modifying the data and project objective. This allows you to generate multiple numerical models from the same conceptual model.

Make changes to the model data and immediately see results - The conceptual model environment provides simultaneous 2D and 3D views which are updated whenever changes to the data are made.


This document provides detailed descriptions of all features and functionality available in Visual MODFLOW Flex.

How to get started

Study this Introduction chapter and Program Overview sections to familiarize yourself with the program.

Then work through the Quick Start Tutorials to familiarize yourself with using VMOD Flex.  These sections cover importing MODFLOW and VMOD Classic projects as well as building new models using the Conceptual Modeling approach.

Learning more

See Conceptual Modeling Workflow for instructions on building a grid-independent conceptual model using your raw data

See Numerical Modeling Workflow for more instructions on working with numerical inputs, translating to MODFLOW packages, and running and analyzing the results.

See Working with Multiple Model Scenarios for a better understanding of the various workflows in VMOD Flex.

See the Program Overview section for detailed instructions on using VMOD Flex.

Looking for help beyond what's in this manual?  We have many additional resources for you:

Getting Started with Visual MODFLOW Flex

An Introduction to Groundwater Modeling Concepts

LinkedIn User’s Group

Visual MODFLOW Flex Frequently Asked Questions (FAQ)

Your Complete Guide to MODFLOW-USG

All Tutorials

Visual MODFLOW Flex ReadMe

White Papers & Technical Articles



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