U.S. Geological Survey
Water Resources Applications Software

Geochemical || Ground Water || Surface Water || Water Quality || General

Summary of MODFLOW-GUI

       modflow-gui - Preprocessor and postprocessor graphical-user
                     interfaces for preparing MODFLOW-96, MOC3D, MODPATH,
                     and ZONEBDGT input data and viewing model output for 
                     use within Argus Open Numerical Environments (Argus ONE)

       MODFLOW-GUI is a graphical preprocessor and postprocessor for the
       U.S. Geological Survey modular, three-dimensional, finite-
       difference, ground-water flow model (MODFLOW-96), solute-
       transport model (MOC3D), particle-tracking postprocessing model 
       (MODPATH).  MODFLOW-GUI, and subregional water budget program 
       (ZONEBDGT) is implemented as plug-in
       extensions (PIEs) for use with Argus ONE version 4.20, revision m or
       later.  Although Argus ONE runs on a variety of computing platforms,
       the MODFLOW-GUI PIEs are only available for systems running
       Microsoft Windows 9x or NT.

       Note: The Argus ONE interface only works with MODFLOW-96 and not
             with earlier versions of MODFLOW.

             MODFLOW-GUI supports the following packages:  BAS5, BCF5,
             WEL5, RIV5, DRN5, GHB5, RCH5, EVT5, SOR5, SIP5, PCG2, DE4, 
             STR1, HFB1, FHB1, MOC3D, MODPATH, and ZONEBDGT.

             The following capabilities are NOT yet supported:  
             CHD1, IBS1, RES1, TLK1, and GFD1.

       Version  00/02/07  Fixed display of the "About" dialog box in Budgeteer on 
          computers using large fonts. Warning message is displayed
          if the user does not have permission to write 
          LastTemplate.met to the directory where the MODFLOW GUI
          is installed. Fixed bug in export of stream diversion numbers.
          Corrected error in expressions for locations of drains and 
          rivers specified with point contours.

       Version  99/12/30  Corrected misspelling in Edit Project Info dialog box.
          Corrected bug in Budgeteer that prevented column titles
          from being written to a file except in the first zone
          Fixed corrupted help file.

       Version  99/11/08  Fixed bug in export of river package when alternative export
          template was used. Made addition of new layers faster.
          Fixed bug in cancelling Edit Project Info dialog box. Added
          support for new capabilities in MOC3D 3.0
       Version 99/10/03  Fixed bug in export template for MODPATH that would cause
          it to produce incorrect input files if the parameter order
          was changed. Fixed bug in JoinFiles PIE that would prevent
          files from being renamed properly if a file with the new
          name already existed. Changed List PIE to allow it to invert
          all the members of a 3D list even if some of the members 
          were equal to zero. Increased speed at which new layers are 
          added to a project by the MODFLOW GUI.

       Version 99/09/03  Added new parameter to Grid (Prescribed Concentration Unit[i])
          to improve the way in which MOC3D concentrations are exported. 

       Version 99/09/02  Fixed bug that caused EVT parameters to be exported 
          incorrectly if the order of the parameters was changed.
          Installer no longer installs ctl3d32.dll. This must be
          installed manually on Windows NT 3.51. It is not required
          for Windows 95 or Windows NR 4.

       Version 99/08/20  Fixed bug that caused MOC3d flow vectors to
          be reversed under some circumstances.

       Version 99/08/20  Fixed bug that prevented the editting of FHB times under
          some circumstances.
          Modified Hydrograph Extractor to support reading MOC3D, 
          MT3D, and SUTRA files.
          Fixed bug in expression for MODFLOW FD Grid.Initial Head Unit[i]
          when the "Average Points and Open Contours" method is used.
          Fixed bug in export of wells when vertical discretization is
          greater than 1.

       Version 99/08/10  Fixed bug in code for inserting new stress periods. 
          Modified Hydrograph Extractor to support reading
          large data files under Windows 95.

       Version 99/08/04  Added Point Rivers and Point Drains. Fixed bug that 
          prevented the "Time-varying constant concentrations"
          check box from working properly in the customized version
          Fixed bug that set the status bar color to the wrong 
          color in the customized version. Added warning about 
          model paths that may not be exported correctly by Argus 
          ONE because they contain "\n". 
          Fixed bug that allowed users to include blank spaces in 
          the root names of files. Changed name of choice for 
          "Method for assigning the IBOUND parameter and prescribed 
          heads in the initial head MODFLOW FD Grid parameter" from
          "Method from MF-GUI versions 1 and 2" to "Method from MF-GUI 
          version 2" because those methods were different. Fixed bug
          that would cause Argus ONE to crash if a MOC3D subgrid was
          used on a computer in which the regional settings specified 
          that a character other than "." was used as the decimal 
          Fixed bug in customized version so that user can choose
          not to export data for some MT3D packages. Eliminated locks
          on the MT3D Postprocessing layers.
          Table headings in the Inport Wells form can now be 
          rearranged. To do this, click on a heading and move it
          to a new position.
          Minor bug fixes in customized version of MODFLOW GUI.
          Updates to to online help.
          HydrographExtractor modified to read MT3D Observations file.
          Added support for importing concentrations for wells
          with MT3D in customized version of MODFLOW GUI.

       Version 99/06/28  Minor additions to help file. Progressbar PIE now 
          updates the elapsed and estimated time remaining once each second. The 
          method used to advance the progress bar has been changed. In the contents 
          of the help system, the titles of some items have been abbreviated
          as a way of working around a bug in the Windows 98 help system.
          With the longer titles, Winhelp would crash under Windows 98 but
          not Windows 95 or Windows NT 4.0. New capabilities added to 
          Hydrograph Extractor: (1) reading and writing a file of cell 
          locations and (2) User can choose activate or deactivate individual 
          series in the chart. MODFLOW_JoinFiles PIE modified to avoid errors 
          when attempting to rename files on network drives. Fixed bug 
          in MODFLOW_CheckVersion PIE function.

       Version  99/05/28 Modifications to support use of a comma as 
          a decimal separator.

       Version  99/05/25 Contour2Data export template corrected. New 
          fuction added to Edit Contours PIE, Data2Contour, that converts data 
          points to point contours. Warning message added to GUI when the user
          activates MODPATH or ZONEBDGT telling them that they may need
          to rerun MODFLOW. Added function to Join Files PIE to facilitate
          correct naming of files when the files will be read by DOS.
          Added protection for ZONEBDGT stress periods and time steps
          that are not entered correctly. Fixed bug in checking that 
          ZONEBDGT time steps are correct.

       Version  99/05/20 Changes made to facilitate customization 
          but no change in functionality.

       Version  99/05/19 Additional information added to online 
          help system. Fixed bug in renaming *.s[i] files.

       Version  99/05/14  Fixed bug that caused porosity grid 
          parameter not be created correctly in some circumstances. Fixed
          bug due to models not recognizing file names with extensions 
          longer than 3 characters. Extensions of zonebudget zone array 
          files and specific yied files changed to .a and .y respectively. 
          PIE functions in progress-bar and join-files PIES were hidden 
          from the user.

       Version  99/05/13  Fixed bug in routine to recognize files 
          saved by previous version of PIE. Activated code to ensure 
          that options are set properly during export.

       Version 3.0    99/04/28  Addition of Help system, STR1, HFB1, FHB1, 
          MODPATH, and ZONEBDGT; numerous less significant changes 
          as detailed in the documentation. 

       Version 2.0 98/07/14 - Addition of MOC3D solute-transport model;
          several cosmetic changes.

       Version 1.41 97/08/12 - Error corrected that occurred when
          considering a confined aquifer and a transient simulation.

       Version 1.4 1997/07/23 - Error corrected in export of storativity
          for confined aquifers and in export of information for time-
          variable and steady stresses.  Specific data files can be
          exported.  Selected geospatial information is checked for errors
          upon exporting.

       Version 1.3 1997/06/02 - Error corrected in export of vertical
          conductance.  Problem corrected in postprocessing three-
          dimensional surfaces.

       Version 1.2 1997/05/13 - Error corrected in handling of "unconfined"
          geologic units and in export of wetting threshold for
          "unconfined" and "convertible" geologic units.

       Version 1.1 1997/04/18 - Error corrected in handling of
          "convertible" geologic units.  Problem with real-value input
          fields corrected.  Units corrected in layer menu.  Default values
          in Misc. Controls and PCG Solver dialog boxes changed.

       Version 1.0 1997/03/14 - Initial release.

       In order to use MODFLOW-96, initial conditions, hydraulic
       properties, and stresses must be specified for every model cell in
       the finite-difference grid.

       Output produced by the MODFLOW-GUI preprocessor is a complete set of
       files for use with MODFLOW-96 and MOC3D.

       MODFLOW-GUI is compiled for use with Argus ONE version 4.1, revision
       t or later, on personal computers running Microsoft Windows 9x or

       Shapiro, A.M., Margolin, J., Dolev, S., and Ben-Israel, Y., 1997, A
          graphical-user interface for the U.S. Geological Survey modular
          three-dimensional finite-difference ground-water flow model
          (MODFLOW-96) using Argus Numerical Environments: U.S. Geological
          Survey Open-File Report 97-121, 50 p.

       Hornberger, G.Z., and Konikow, L.F., 1998, Addition of MOC3D solute-
          transport capability to the U.S. Geological Survey MODFLOW-96
          graphical-user interface using Argus Open Numerical Environments:
          U.S. Geological Survey Open-File Report 98-188, 30 p.

       Winston, R.B., 1999. Upgrade to MODFLOW-GUI: Addition of MODPATH, 
          ZONEBDGT and Additional MODFLOW Packages: U.S. Geological Survey 
          Open-File Report 99-184, 63 p.

       Harbaugh, A.W., and McDonald, M.G., 1996, User's documentation for
          MODFLOW-96, an update to the U.S. Geological Survey modular
          finite-difference ground-water flow model: U.S. Geological Survey
          Open-File Report 96-485, 56 p.

       McDonald, M.G., and Harbaugh, A.W., 1988, A modular three-
          dimensional finite-difference ground-water flow model: U.S.
          Geological Survey Techniques of Water-Resources Investigations,
          book 6, chap. A1, 586 p.

       Konikow, L.F., Goode, D.J., and Hornberger, G.Z., 1996, A three-
          dimensional method-of-characteristics solute-transport model
          (MOC3D):  U.S. Geological Survey Water-Resources Investigations
          Report 96-4267, 87 p.

       Leake, S.A., and Lilly, M.R., 1997, Documentation of a computer
          program (FHB1) for assignment of transient specified-flow and
          specified-head boundaries in applications of the modular
          finite-difference ground-water flow model (MODFLOW): U.S. Geological
          Survey Open-File Report 97-571, 50 p.

       Hsieh, P.A. and Freckleton, J.R., 1993, Documentation of a computer 
          program to simulate horizontal-flow barriers using the U.S. 
          Geological Survey modular three-dimensional finite-difference 
          ground-water flow model: U.S. Geological Survey Open-File Report 
          92-477, 32 p.

       Prudic, D.E., 1989, Documentation of a computer program to simulate 
          stream-aquifer relations using a modular, finite-difference, 
          ground-water flow model: U.S. Geological Survey Open-File Report 
          88-729, 113 p.

       Operation and distribution:
          U.S. Geological Survey
          Hydrologic Analysis Software Support Program
          437 National Center
          Reston, VA 20192


       Official versions of U.S. Geological Survey water-resources analysis
       software are available for electronic retrieval via the World Wide
       Web (WWW) at:

       and via anonymous File Transfer Protocol (FTP) from:

                  water.usgs.gov (path: /pub/software).

       The WWW page and anonymous FTP directory from which the MODFLOW-GUI
       software can be retrieved are, respectively:


       If you would like to obtain the price of and (or) order paper copies
       of USGS reports, contact the USGS Branch of Information Services at:

                  USGS Information Services
                  Box 25286
                  Denver Federal Center
                  Denver, CO 80225

       To inquire about Open-File Reports or Water-Resources Investigations
                  Tel: 303-202-4200; Fax 303-202-4695

       To inquire about other USGS reports:
                  Tel: 303-202-4700; Fax 303-202-4693

       modflw96 - Modular three-dimensional finite-difference
                     ground-water flow model
       moc3d - Three-dimensional method-of-characteristics
                  ground-water flow and transport model
       MODPATH - particle tracking model

       ZONEBDGT - subregional water budget program

Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.

Web page comments, contact: Richard Winston <rbwinst@usgs.gov>
U.S. Geological Survey
431 National Center
Reston, VA 20192

Last Iteration: August 02, 2007