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Importing Models

Importing Visual MODFLOW Classic Projects


Before You Start!

If you need to modify or maintain a model that utilizes any of the following features, you must continue to use Visual MODFLOW Classic interface for this:


Flow Engines (MODFLOW-96)

Transport Engines (MT3D99, PHT3D)

Flow Packages (ETS1, MNW, STR)




To import your Visual MODFLOW Classic project, select the .VMF file and click OK to continue.  The .VMF file must be from Visual MODFLOW v.2009.1 or later.  


If your Visual MODFLOW Classic project contains Transport Boundary condition parameters, please refer to the discussion on the differences between how Classic and Flex handle point source concentrations for more details.  As of Visual MODFLOW Flex version 5.0, transport boundary conditions will be imported along with flow boundary conditions.


While the model is created, you will see the corresponding inputs added to the Model Explorer.


Importing MODFLOW-2000, 2005 Data Sets


Often you may need to import an existing MODFLOW data set into Visual MODFLOW Flex in order to review the model, or evaluate different scenarios. Visual MODFLOW Flex can import existing MODFLOW data sets provided they are in MODFLOW-2000, MODFLOW-2005, or MODFLOW-SURFACT format.


Please Note: Visual MODFLOW Flex currently imports MODFLOW-2000 and MODFLOW-2005 Groundwater Flow process files only. As a result, it will ignore files associated with the Sensitivity Process, the Parameter Estimation Process, and the Transport Process. Support for these additional processes may be added to future versions of Visual MODFLOW Flex.


To import a MODFLOW-2000 or MODFLOW-2005 model data set, select the .NAM file (or .MODFLOW.IN) at the Import Grid screen.


Please Note: The .NAM file (or .MODFLOW.IN file) is an ASCII file containing a list of the input and output data files for the model, and their location (folder and pathname) on the computer. If the model files have been moved to a new location, the file must be manually updated to reflect the new file location(s).


Once you have selected the desired model data file, click on the [Open] button to continue.


For more details on the Import MODFLOW process and limitations, please refer to Section 2.2 of the Visual MODFLOW (Classic) User Documentation.


Please Note: Visual MODFLOW Flex does not currently support direct import of MODFLOW-SURFACT data sets.  These must be imported as part of a Visual MODFLOW Classic project file.



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