MODFLOW Resources

Last updated on June 15, 2006

I recently attended the MODFLOW and More 2006 Conference and was surprised that so many people still remember the The Modflow Help File.  Consequently, I have updated this web page by adding a few new items, updating some more and removing links that no longer work.  One link in particular is worth mentioning: The Online Guide to MODFLOW-2000.

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This is the Internet Resource page of The Modflow Help File. If you have installed the Modflow Help File and are accessing this page locally you can update it by loading the most recent version of this page and saving it locally as mfh_rec.htm. On the most recent version of the Modflow Resource page you can also check the version number (2.2.1) of the Modflow Help file to see whether you want to download an updated version.

Go back to Contents. Note: The Contents link will not work unless you have installed the Modflow Help file and are accessing this page locally.

Do you use a commercial version of MODFLOW?

Other people would probably like to hear what you think of it. Please send me your comments on both the good and bad points of different versions of MODFLOW. I would also like to know what MODFLOW packages are included with your version of MODFLOW and any other programs that come with it such as ZONEBUDGET, or MODPATH. In your message, please state that I may publish your message.

Free Resources

Commercial Resources


Reviews of Visual Modflow, Processing Modflow for Windows, Argus ONE and Groundwater Vistas.

User Comments

  1. Groundwater Vistas, Pest, and MODFLOWP
  2. Argus Open Numerical Environments
  3. Groundwater Modeling System (GMS)
  4. Argus Open Numerical Environments
  6. Visual Modflow

The International Ground Water Modeling Center hosted a MODFLOW'98 conference on October 4th through 8th, 1998 at the Colorado School of Mines campus, Golden, Colorado.

Although you can get a free copy of MODFLOW, you may prefer to get a commercial one instead. The advantages that you may get from commercial versions include: Not all commercial versions of MODFLOW are alike. As far as I know no version of MODFLOW incorporates all the packages that have been written. Before purchasing MODFLOW, you should find out what packages you think you might want and what are available. You should also find out about customer support. MODFLOW is not an easy program to use and at some point you will probably want someone you can turn to for assistance. Some versions of MODFLOW include preprocessors and postprocessors. Others do not. Preprocessors and postprocessors may also be purchased independently of MODFLOW. Preprocessors simplify the preparation of MODFLOW input files tremendously. Several versions of MODFLOW are available as demos either free or for a small fee. It would be worth-while investigating which of those is fastest and easiest to use. (You should also inquire whether the demo is significantly slower than the full version.) You will probably spend more time preparing input files and interpreting output files than actually running the model (though it may not seem like that sometimes) so both program speed and ease of use are major considerations.

The commercial sources I have listed here are all those of which I am aware. I do not endorse these or any vendors nor have I received any fee from any of them. (However, I used to work for Argus ONE.) However, Waterloo Hydrologic has given me a copy of Visual MODFLOW 2.0, Wen-Hsing Chiang has given me a copy of Processing Modflow for Windows 4.0. Argus Interware gave me a copy of Argus ONE and Environmental Simulations, Inc., gave me a copy of Groundwater Vistas I have written reviews of all four ptorms programs.

The order in which vendors appear is generally the reverse of the order in which I became aware of them. (i.e. the ones I most recently became aware of are closest to the top.) All quotations are used with permission.

Free Resources



It reads data from the following programs to create these plots

MODFLOW -related programs

Shareware archives If you need some sort of contour program or plotting program, these are a couple of good places to try. Most of the programs are shareware rather than free, however.

Commercial Resources

I have requested permission to quote selective passages from the web pages of all the following suppliers of MODFLOW and MODFLOW related programs. Some have not yet responded. The amount of material I have listed here bears no relationship to the quality of that companies products. I urge you to find out for yourself what each of these companies has.

I have tended to add new links to the top of the list so companies are listed last tend to be those with which I am most familiar. Those marked with an asterix * are those I consider to be major suppliers in the US markert at this time or else have a product that has some especially attractive feature. I base this judgement, in part, by what I have heard about these companies and their products. Other companies may either have new products that do not yet appear to have become popular or I may just not have heard much about them. I also base my judgement in part on what information I have been able to learn from their web pages or other advertising. If a company has a product that appears to offer signicant advantages over competing products, I have marked it. I am looking for

  1. faster model execution
  2. support for public domain packages beyond those in the original version of MODFLOW
  3. proprietary packages that significantly extend modeling capability
  4. capability of importing data from existing databases especially climatic data bases
  5. anything else that appears to be an especially useful feature


VIEWLOG is a borehole management and interpretation system.  It allows the user to visualize and correlate borehole data and use the data to create MODFLOW models.  I saw this program demonstrated at the MODFLOW and More 2006 Conference and was impressed by it.  I have not tried it personally.

ModTech New

ModTech is a pre- and post-processor for MODFLOW and MT3DMS.  Their web site describes several proprietary additions the standard programs.  They also say it has GIS capabilities.

Graphic Groundwater

Shareware Pre- and Post-Processor for MODFLOW and MODPATH.


Datasurge retails Visual MODFLOW, Groundwater Vistas and other groundwater modeling programs.


MODFLOWT is a new version of MODFLOW that includes modules for simulating three-dimensional contaminant transport. From their web page, it appears to be faster than MT3D without sacrificing accuracy. MODFLOWT was jointly developed by HydroSOLVE and HSI Geotrans.

The following quotes from the HydroSOLVE web page describe some of the features of MODFLOWT.

MODFLOWT is fully compatible with previous versions of MODFLOW.

The program offers an extensive array of solution options for simulating contaminant transport in groundwater.

Three New Packages for MODFLOW

Modified versions of the River and Stream packages and a package for horizontal and/or multiaquifer wells.

CADSHELL® Graphical Preprocessor and Postprocessor for MODFLOW / MODPATH / MT3D

CADSHELL allows you to use AutoCAD as a pre and postprocessor for MODFLOW, MODPATH, and MT3D. The following are quotes from their web site.


distributes COSIM, a FORTRAN program for co-conditional and co-unconditional geostatistical simulation using the approach of Carr and Myers. Their version is set up to interface with MODFLOW (150 Kb). They also have a list of software distributors and an extensive list of commercial programs many of which are linked to MODFLOW including

HarbourDom GmbH

Köln, Germany, distribution agent for Visual MODFLOW among other things.

Environmental Modelling Centre (Pty) Ltd

I don't know much about this company but in an email message from Rainer Krantz, he said they
"are the southern African agents for the environmental modelling package called ENTEC. The software has been developed in Perth Australia and has excellant 3D graphic visualisation,a database and interfaces to MODFLOW and MT3D."
There is a little more information on them at

Processing MODFLOW home page

Wen-Hsing Chiang, one of the authors of Processing Modflow for Windows (PMWIN), has set up a web page that describes his programs. He has included a fully functional demonstration version of PMWIN on his home page.

A previous version of Processing Modflow for Windows is now available as freeware

The following are quotes from his web page which illustrate some of the features of PMWIN.

PMWIN is capable of using all available memory. PMWIN can handel models with up to 80 layers and 1000 stress periods, and each model layer can consist of up to 2000 × 2000 cells. The model grid can be shifted, rotated, refined and overlaid on up to five DXF-background maps. Model data can be specified for each finite-difference cell individually, in the form of zones, or even automatically interpolated by the Field Interpolator.

A new Field Generator generates synthetic fields with heterogeneously-distributed transmissivity or hydraulic conductivity and allows you to incorporate effects and influences of unknown small-scale heterogeneities into the groundwater model.

PMWIN provides a powerful Result Extractor. The powerful tool allows you to extract results from any stress period, time step and layer and put them into a spread sheet. You can examine the results, create contour plots with PMWIN or save them in ASCII format or even SURFER compatible files.

Advective transport can be done by the powerful PMPATH for Windows. You can perform forward and backward particle tracking for steady-state and transient flow fields with just a few clicks of the mouse.

PMWIN support the use of MT3D to simulate changes in concentration of single species miscible contaminants in groundwater considering advection, dispersion and chemical reactions.

I have written a review of PMWIN.

Siborg Systems Inc

Siborg Systems distributes a new solver (SibLin) for Modflow that they have written. I've tested the solver with some simple problems. It is supposed to work better in systems with highly inhomogeneous hydaulic conductivity. To test this, I set up models with stochastic variation in the hydraulic conductivity and ran them with both PCG2 and the SibLin solver. From the results you can see that their claim appears to be correct. For problems with higher levels of heterogeneity, the SibLin solver converged but PCG2 didn't. (SIP didn't work either for the one case on which I tested it.) For more homogeneous models SibLin was slightly slower than PCG2

Execution Time (sec.)
standard deviation of log(K) PCG2 SibLin
0.5 13.7 14.3
1 22.5 28.156
1.5 failed to converge converged
2 failed to converge converged

HSI GeoTrans, Inc.

MODFLOW Data Reader (MDR) is an ArcView(R) GIS Software extension that imports MODFLOW input data sets into ArcView shape files. The optional version of MDR can contour MODFLOW output data into lines and/or shaded model grid cells. The shape files created with MDR are available for further processing in the ArcView Software environment. HSI GeoTrans and HydroSOLVE jointly developed MODFLOWT which simulates contaminant transport in addition to groundwater flow. MODFLOWT was jointly developed by HydroSOLVE and HSI Geotrans. HSI GeoTrans also sells ModelGIS an Arc/Info Interface for MODFLOW, and MODMAN an optimization module for MODFLOW. The following are quotes from the web pages describing MODFLOWT, ModelGis, and MODMAN.
MODFLOWT is a new version of MODFLOW that includes modules for simulating three-dimensional contaminant transport. The model, developed by Glenn Duffield of HydroSOLVE and GeoTrans, incorporates the advective-dispersive transport equation and uses the fully-implicit finite-difference technique found in the public domain code FTWORK developed by GeoTrans for the Westinghouse Savannah River Laboratory.

In addition to existing MODFLOW packages, MODFLOWT includes modules for: Basic Transport, a Block Centered Transport, an ORTHOMIN solver and an Observation Well package.

(In an email message Jeffrey Benegar said that MODFLOWT simulates contaminant transport with decay chains and variable anisotropies.)
ModelGIS is a comprehensive, menu-driven interface linking groundwater models to Arc/Info GIS software on UNIX workstations. It allows: model grids, model input, and model output to be created, stored, and displayed within Arc/Info.

A complete pre-processor for the MODFLOW groundwater code is included, and required components for other finite-difference models (model grid, lists, and matrices) can be created. This powerful interface increases modeling accuracy and efficiency, particularly when model re-gridding is required.

Developed by GeoTrans, MODMAN is an optimization module for MODFLOW.

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HydroGeoLogic, Inc.

HydroGeoLogic sells MS-VMS which is based on MODFLOW but has added capabilities. including variably saturated flow modelling, interactive input preparation and 2D and 3D plots and animation. Existing MODFLOW input files can be imported into MS-VMS. You can download a demo version of the program. The following is quoted from one of their web pages.
MS-VMS offers the following capabilities: MODFLOW-SURFACT forms the nucleus of MS-VMS. MODFLOW-SURFACT, through its new computational modules based on robust, efficient and mass-conservative algorithms, overcomes the limitations and eliminates the restrictions of MODFLOW and its current transport counterparts. A few of the aforementioned limitations concern: rewetting of drained cells, handling of pumping wells, solute mass balance problems, numerical dispersion and oscillations, and implicit assumption of negligible impact of transient flow storage effects on transport.

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"EQWin Geology" is a data management program. Borehole and other data can be entered in EQWin and exported to GMS, and Groundwater Vistas as well as Rockware's LogPlot and Surfer by Golden Software.

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Geotechnical & Geo-environmental Software Directory

Program index and directory by category. This is a list of commercial programs related to Modflow. Their list is better organized than this one. You can find alternate suppliers for a number of programs there.

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Software Solutions Directory sells ModelGIS which links MODFLOW to ARC/INFO®

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Environmental Systems and Technologies

EST has an extensive list of commercial programs for sale including MODFLOW, MODFLOW preprocessors, and MODFLOW postprocessors. You can purchase demo versions of some of the commercial programs for modest fees. The following are quotes from their web pages and an email message.
PM is a tool to simplify creating of data files for MODFLOW, MODPATH and MT3D and for post-processing model output. The program utilizes pull down menus and graphical editing to facilitate the otherwise tedious job of running 3-D flow and transport models.
The newest version of PMWIN (available soon) is a tool to simplify the creation of data files for MODFLOW, MODPATH and MT3D and for post-processing model output. The program utilizes graphical editing in Windows to facilitate the otherwise tedious job of running 3-D flow and transport models.
(PMWIN is now available.) I have written a review of PMWIN.
ES&T distributes the IGWMC version of MODFLOW which includes two executable codes: 1) a small site version that will run on PCs with only 640 KB of memory, and 2) an extended memory version for more powerful computers. The program includes a pre-processor, PREMOD, for data entry and editing and a post-processor, POSTMOD, which reformats MODFLOW binary files into a form that can be read by GRAPHER, SURFER and other packages.
MODFLOWP is an extension of MODFLOW that includes a Parameter Estimation Package to estimate parameters by nonlinear regression. MODFLOWP functions identically to MODFLOW when the Parameter Estimation Package is not used. Parameters may be estimated by minimizing a weighted least squares objective function by the modified Gauss Newton method or by a conjugate gradient method.

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S.S. PAPADOPULOS & ASSOCIATES, INC. has an extensive list of commercial programs for sale including MODFLOW, MODFLOW preprocessors, and MODFLOW postprocessors. You can download a demo version of MODFLOW and some MODFLOW related programs including MT3D. They are also selling a text on applied groundwater transport modeling. The following quotes are from one of their web pages and email messages
MODFLOW/mt is an enhanced version of the U.S. Geological Survey finite difference ground water flow simulator. In addition to full compatibility with the standard USGS version, MODFLOW/mt includes the additional packages BCF2, PCG2, and STR2, and SSP&A's LKMT package which links MODFLOW to MT3D. MODFLOW/mt also includes enhanced array readers which simplify data input.
PATH3D is a three-dimensional particle tracking code for MODFLOW. PATH3D can be used to visualize 3-D flow patterns, to delineate capture zones and wellhead protection areas, and to evaluate the effectiveness of ground-water remedial designs under complex hydrogeologic conditions. PATH3D is capable of performing forward and reverse particle tracking for steady flow fields, and forward tracking for transient flow fields. The particle tracking algorithms in PATH3D incorporate automatic stepsize control to achieve a user-specified error criterion with a minimum of computational effort. PATH3D also includes techniques that increase the accuracy of tracking in the vicinity of weak sinks and deformed model layers.
MT3D is a comprehensive simulation code for analyzing the three-dimensional migration of solutes in ground-water systems. MT3D is capable of simulating the advective and dispersive transport of a single dissolved species, and can consider equilibrium sorption with linear and nonlinear isotherms and first-order decay and production reactions. MT3D interfaces directly with the USGS ground-water flow code MODFLOW, and accommodates steady and transient flow solutions. MT3D incorporates four solution options for treating the advection term, including an accurate and efficient 3-D implementation of the method-of-characteristics. The multiple solution options permit the calculation of accurate and efficient solutions for a wide range of transport conditions.
ModIME is an integrated modeling environment for MODFLOW, PATH3D and MT3D. ModIME allows users to prepare input data rapidly and accurately, run simulation codes, and display and analyze model results in an interactive and intuitive graphical environment. ModIME users can either import existing data files from different sources, or enter and edit data directly with the mouse on a screen display of the model grid and basemap. ModIME includes an advanced zoom capability that allows users to generate automatically small-scale local models over any subregion of a larger scale model.

PEST is a nonlinear parameter estimation package with a difference. The difference is that PEST can be used to estimate parameters for just about any existing computer model, whether or not a user has access to the model's source code. PEST is able to "take control" of a model, running it as many times as it needs to while adjusting its parameters until the discrepancies between selected model outputs and a complementary set of field or laboratory measurements is reduced to a minimum in the weighted least squares sense.

One reader has sent in a comment on PEST.

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International Groundwater Modeling Center

You should be able to get almost any ground water modeling program at IGMC. You can download free demos of Visual MODFLOW, MODFLOWT, and ZBsoft from "FREE!! Demos of IGWMC software/".

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Argus Open Numerical Environments

The Argus Open Numerical Environments and its MeshMaker modules are pre- and post processors for a variety of groundwater models including MODFLOW and MT3D. You can download a demo version, an interactive tutorial and on-line documentation in Adobe Acrobat format. If you already have Argus Open Numerical Environments, you can download several free templates that work with it from their Export page. They also have a demo you can try out. On Dec. 10, 1996, Argus offered a free upgrade to the new version 3 to licensed users of previous versions. The new version also you to use a public-domain Plug-In Extension for Modflow as well as several other models the Plug-In Extension was developed by the USGS.

In my view, the key advantages of ArgusONE are that:

  1. it frees you from grid-based editing of your model
  2. it allows you to work with any model (except, possibly, models that have their own specialized graphical user interfaces)
  3. it can use expressions to assign model parameters thus allowing a much greater sophistication in the design of models.

The following is quoted from the Argus web site.

Linking your data flow to numerical grids and meshes enables you to make your data available for your numerical model. By storing your conceptual model and your information in linked layers, and not directly on your grids and meshes, ArgusONE allow you to refine your meshes and grids while it automatically reassigns the data to them.

Manipulating your information is easily performed by combining your database structure and the abundance of functions and operators available through Argus Open Numerical Environments (ArgusONE) expressions. ArgusONE expressions allow you to easily perform math, trig, string, GIS, logical, search and other operations on information stored in your ArgusONE layers. ArgusONE expressions are also available in the export template thus allowing you even greater control over your output format.

Export templates give you full control over your export file format. This enables you to directly export the information you've created in Argus MeshMaker to any numerical model you use in the exact file format the model requires.

Argus-PIE is an empowering technology which enables users and Developers/VARs of ArgusONE to tailor and extend the Argus technology to their special needs. The Argus-PIE technology is based on Argus Open Numerical Environments' inherent capabilities and allows developers to tap into ArgusONE's powerful tools from external codes. It was developed by Argus to allow developers to easily and quickly offer and market their advanced technologies in numerical modeling, geostatistics, 3D visualization and other areas, to the rapidly growing community of ArgusONE users as well as to their own customers.

A wide choice of Plug-In Extension (PIEs) products which include:

Using the new post-processing tools you can present and investigate your model results in the same window you've created your model input. The six new scientific visualization methods are: 3D Surface, Color Map, Contour Map, Vector Diagram, Particle Path-lines and Cross-Section.

Two pople have commented on Argus Open Numerical Environments.

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Groundwater Modeling System (Updated URL)

The Groundwater Modeling System is a pre- and postprocessor for a variety of groundwater models including MODFLOW. You can download a demo version. They also have a mailing list which has interesting discussions from time to time. One of the software managers involved in the project has an abstract and online description which is separate from the main web page. The following is quoted from one of the web pages at the main site.
The Department of Defense Groundwater Modeling System (GMS) is a comprehensive graphical user environment for numerical modeling. GMS provides tools for site characterization, model conceptualization, mesh and grid generation, geostatistics, and sophisticated tools for graphical visualization. Several types of models are supported by GMS. The current version of GMS provides a complete interface for the codes FEMWATER, MODPATH, MODFLOW and MT3D. Many other models will be supported in the future. The interface to GMS has been designed in a modular fashion. Nine separate modules representing different data types are provided.

FEMWATER documentation is available online.

See also: GMS/FEMWATER site by Rolf Herrmann

(One person has made some comments on GMS.)

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Environmental Simulations, Inc.

They sell MODFLOW and a few other programs. They claim their version of MODFLOW is 10-20% faster than other versions. They have reformatted all the MODFLOW manuals as Windows help files which you can buy separately. You can download a free demo of their version of MODFLOW. On June 14, 1996 they announced the release of a new Windows® pre- and post-processor, Groundwater Vistas. The following is quoted from one of their web pages.

One reader has submitted a comment on Groundwater Vistas.

MODFLOWwin32 is ESI's version of this popular groundwater flow model, originally developed by the USGS. MODFLOW is a 3D finite-difference groundwater flow model and there are many versions available. Unlike MODFLOW versions from other vendors, however, ESI's MODFLOWwin32 was developed specifically for Microsoft Windows (Win32s) and Windows NT. Using a unique technology, MODFLOWwin32 runs as a DLL which is controlled by a shell program or by ESI's ContourWin32 which is provided with MODFLOWwin32.
MODFLOWwin32 contains all of the popular add-on packages (BCF2, PCG2, etc.) and is a 32-bit program utilizing all available memory. ContourWin32 is a postprocessor for contouring MODFLOWwin32 results and displaying particle trace pathlines computed by MODPATH.
Groundwater Vistas (GV) is a unique groundwater modeling environment for Microsoft Windows.... GV supports the use of the PEST model-independent calibration software. GV displays the model design in both plan and cross-sectional views.... Model results are presented using contours, shaded contours, velocity vectors, and detailed analysis of mass balance. MODPATH particle traces are also displayed in both plan and cross-sectional views. Another unique aspect of GV is its use of grid independent boundary conditions. Grid-independent boundaries do not change position as the grid is modified.

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makes The Environmental WorkBench which is an interactive post-processor for MODFLOW SSESCO makes among other things. The following are quoted from an old version of one of their web pages.
The Environmental WorkBench product (EWB) from SSESCO is an extremely easy to use visualization and analysis application targeted at environmental data. It is aimed at putting sophisticated interactive visualization capabilities directly in the hands of the scientist or engineer working with the data, without the need for a computer support person. It is distinguished from data flow products like AVS in that it provides a ready to use interface without any network programming required. The EWB currently has numerous users in the fields of meteorological research, air quality work, and groundwater remediation.
SSESCO does not develop models. We work with research groups and other businesses that have developed models to make a whole package. At this point we have models from various environmental fields connected to the system including groundwater, atmospheric, photochemical, and pollution dispersion models. The models we have worked with include: MODFLOW, PORFLOW, STMVOC, RAMS, ARPS, MM5, Minerve, Hermes, ADOM, RADM, ISCST, LPDM.

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BOSS International - USA Site

See also: They sell Visual MODFLOW among other things. Visual MODFLOW includes pre- and postprocessors. The following are quoted from their site.
BOSS GMS is the most advanced, powerful, and comprehensive groundwater modeling package available. The program provides complete support for the USGS MODFLOW and MT3D 3-D finite difference flow and contaminant transport groundwater models. All input is through easy-to-use data entry dialog boxes. In addition, tools are provided for site characterization, model conceptualization, mesh and grid generation, geostatistics, and output post-processing.

Visual Modflow is a powerful, comprehensive yet easy-to-use pre- and post-processor for the USGS MODFLOW and MODPATH 3-D finite difference flow and particle tracking groundwater models. The program's intuitive mouse-driven user interface reduces the time required to complete a groundwater project from several days to just a few hours.

I've written a review of Visual MODFLOW.

(One person has made some comments on GMS.)

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GIS\Solutions, Inc.

MODFLOW and FEMWATER pre and post processors (models included). The following is quoted from one of their web pages.
GIS\Key is used by environmental professionals to manage chemistry, geology, and hydrology data and create the standard environmental work products and reports used by the environmental community everyday.
GIS\Key utilizes two basic components to manage data, create work products and reports. There is a database side of the system and a graphic side of the system. Both components use industry standard software and formats to guarantee compatibility with existing and future, data and reporting needs. The database is Microsoft FoxPro and the graphic engine is AutoCAD. FoxPro uses the popular dBase III+ or .DBF file format which can be read from and written to, by almost any software on the market. The graphic AutoCAD format is the most widely used and transferred graphic format.

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Waterloo Hydrogeologic, Inc.

Waterloo Hydrogeologic, Inc. is the developer of Visual Modflow. The following are quotes from email messages.
Visual MODFLOW, by Waterloo Hydrogeologic, Inc., is a fully integrated modeling environment for the USGS's MODFLOW and MODPATH. It supports all of the most popular and established MODFLOW and MODPATH packages for analyzing three- dimensional, steady-state or transient groundwater flow in confined or unconfined, heterogeneous and anisotropic porous media with irregular layer thicknesses. The model calculates and displays hydraulic head contours, drawdown contours, flow velocity vectors, time-related flow pathlines and calibration results. This seamless package contains both a pre- and post-processor which allows the user to graphically design the model, run the analysis, and display the results without ever leaving the Visual MODFLOW environment. Visual MODFLOW's innovative graphical-user-interface makes three-dimensional modeling more accessible and practical than ever before.
In addition, a visual interface for MT3D (the popular three-dimensional contaminant transport program) is currently being developed and will be ready for release by March, 1996.

Waterloo Hydrogeologic will soon be placing a copy of the Win32 MODFLOW Suite on our Web site. It contains the latest version of the USGS MODFLOW (MODFLOW96), MODPATH, Zone Budget and the DoD version of MT3D (v. 1.5) compiled to run as Windows 95/NT, 32-Bit applications. In addition, this unique modeling utility provides a real-time graphical display of the MODFLOW solution convergence data and allows you to modify the solver parameters and convergence criteria on-the-fly. In addition, it also provides a real-time graphical display of the Zone Budget data which displays Inflows and Outflows for specified regions within the model domain.

As MODFLOW provides the results in the form of a binary heads file, the Win32 MODFLOW Suite will also come with a results extractor which allows you to export heads and drawdowns to an ASCII file.

Unlike other graphical software packages which are freely available, the Win32 MODFLOW Suite does not require you to purchase any other proprietary software packages to be used on your modeling project. Like the public domain MODFLOW, it require standard USGS MODFLOW input files which can be developed using a standard test editor or by using most graphical pre- and post-processors on the market.

The Win32 MODFLOW suite will be free to download from our Web site at by May 21, 1997.

Patrick Delaney
Marketing Manager
Waterloo Hydrogeologic, Inc.

I have written a review of Visual Modflow.

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RockWare Inc. Earth Science Software

Groundwater Modelers Prod. Pak: Converts MODFLOW, SUTRA and MOC output to a variety of file formats for graphical display of model results (Mac)
Graphic Groundwater integrates grid development, data input, model execution, and analysis of the results all in one package. It is based on the U.S.G.S. Three-Dimensional Modular Finite Difference Groundwater Flow Model (MODFLOW). You no longer need cumbersome pre- and post-processors. You create the finite difference grid with the mouse and simple dialog boxes, and can superimposed and georeference the grid on a scanned or digitized map, if you choose.
MOD3DFD386/486 is an enhanced implementation of the U.S. Geological Survey's modular 3-D finite difference groundwater flow simulation model ("MODFLOW"). MOD3DFD386/486 additional features: has a new River Routing package for flexibility in modeling surface water flows; produces graphics input files enabling graphical display of model results on the screen, dot matrix printer, ink jet, and laser printers, and pen plotters; includes User Guide and USGS documentation.
ModelCad386 graphically generates the finite-difference model grid and saves it in a model-independent format. The modeler visually adjusts the grid spacing, boundary conditions, and aquifer properties and instantly generates the model input data files. Translators are provided for four of the most commonly used models: • the USGS model MODFLOW • the USGS model MOC • MT3D solute transport model • MODPATH particle tracking model.
MODFLOW386 features: Addresses all available RAM; New option for resaturation of dry cells; Utility to produce SUR-FER grid files; Source code is included. Geraghty & Miller has added unique items to the MODFLOW code (as distributed by the USGS (McDonald & Harbaugh, 1988)) that are not readily available anywhere else. This allows you to run very large simulations.
MODPATH386: USGS particle-tracking analysis for MODFLOW and extended DOS. Addresses all available RAM. Utility converts MODPATH output to SURFER-compatible file (XYLINE format). Includes source code. MODPATH386 is the latest version of MODPATH (Version 1.2, Pollack, 1990) released by the USGS. MODPATH is a three-dimensional advective transport (particle-tracking) package that works in conjunction with MODFLOW.
ModflowP: Performs nonlinear least-squares parameter estimation for ModelCAD, allowing ModelCAD 386 users to quickly master the complexities of model calibration
Modflow Utilities: Utility software for ModFLOW386
Visual Modflow: DOS-based groundwater modeling environment for analyzing 3-D, steady-state or transient groundwater flow

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The Scientific Software Group

The Scientific Software group has an excellent printed catalog. You can download individual pages of their catalog in pdf format as well as the Adobe pdf reader. You can download a demo of Visual MODFLOW among other things. They have provided the following descriptions of their versions of MODFLOW and other MODFLOW-related programs. You should also try using the search feature under "By Category" (One of the categories is MODFLOW models but not all their MODFLOW models were listed there the last time I checked.)
BIOMOD 3-D (Bioremediation Fate and Transport Simulator) is a 2-D/3-D finite-element fate and multicomponent transport model that is linked to the USGS finite-difference MODFLOW 3-D model.
BIOMOD has the following key features:
MODFLOW/EM - A new version of MODFLOW is available that includes the spreadsheet preprocessor, MFI. MFI uses a Lotus-compatible spreadsheet for entering arrays. This allows the power of spreadsheet editing and programming functions to be used for generating model data. Arrays generated by other programs can also be used as part of a dataset. MODFLOW/EM runs independently or within Microsoft Windows. It includes the following packages: Transient Leakage, IBS1, CHD1, STR1, PCG2, BCF3, GFD1, RAD-MOD, ZONE BUDGET, and the Horizontal Flow Barrier Package. MODFLOW/EM is technically supported by Michael G. McDonald, co-author of MODFLOW.
MODPATH/EM - Particle Tracking for MODFLOW/EM including transient flow. MODPATH/EM is a brand new version that permits forward and backward tracking in transient flow fields as well as steady-state flow fields. It also permits the release of particles over a time interval. It runs independently or within Microsoft Windows. MODPATH/EM is technically supported by Michael G. McDonald, co-author of MODFLOW.
Visual MODFLOW - Integrated Modeling Environment for MODFLOW and MODPATH. Visual MODFLOW allows the user to graphically input data, run MODFLOW and MODPATH, and visualize the results in plan or cross-section views--all within one package. Visual MODFLOW's intuitive mouse-driven user interface has reduced the time to complete a typical simulation job from several days to a few hours. The input structure is designed so that the user concentrates on physical locations and times rather than model grid coordinates or model time steps. Multiple DXF sitemaps can be overlaid on the grid. Visual MODFLOW can also import MODFLOW data files making it useable for previously created MODFLOW models.
PROCESSING MODFLOW for Windows (PMWIN) - A powerful graphical preprocessor and postprocessor for MODFLOW, MODPATH and MODPATH-PLOT, MT3D, MODINV and PEST. PMWIN is now a fully integrated package which includes MODFLOW, PMPATH, and PMDIS (assigns cell values by using Kriging). The preprocessor has pull-down menus and a graphical model designer that consists of PMCAD which allows for constructing a general map of the model area, the GRID EDITOR which is used for specifying the physical data of each model call individually, and the ZONES editor for specifying the areally-distributed physical data in the form of zones.
I have written a review of PMWIN.
GMS (Groundwater Modeling System) - The Department of Defense' comprehensive graphical modeling environment designed for the simulation of ground-water flow and transport. Features include site characterization, two- and three-dimensional mesh generation, graphically-based model input for finite-element and finite-difference flow and transport codes, interpolation and geostatistics, DXF input and output, as well as complete 3-D visualization in both the UNIX-X Windows and Microsoft Windows environments. GMS also provides an interface to MT3D and FEMWATER.

(One person has made some comments on GMS.)

MT3D - A 3-D solute transport model for simulation of advection, dispersion, and chemical reactions of contaminants in ground-water systems using the MODFLOW model. It includes 3-D transient flow fields with the presence of wells, drains, rivers, recharge, evapotranspiration and a variety of boundary conditions.
MODFLOWP (Parameter Estimation for MODFLOW) - The USGS' Computer Program for Estimating Parameters of a Transient or Steady-State, Three-Dimensional, Ground-Water Flow Model using Nonlinear Regression. Code has been added to the original program to facilitate the input of file names and the opening of appropriate files.

One reader has made comments on MODFLOWP and PEST.

MODINV (MODFLOW Parameter Estimation) - A powerful non-linear weighted least squares MODFLOW parameter value optimizer. Given a single or multiple set of borehole water levels, MODINV is able to adjust parameter values within the active part of the MODFLOW finite-difference grid until the fit between observed and calculated borehole heads is minimized in the least squares sense. It can optimize parameter values for any model type that MODFLOW can run-single or multilayered, confined or unconfined, steady state or transient.
Argus Numerical Environments (General Purpose Finite-Element and Finite-Difference Numerical Preprocessors) - A preprocessing tool for not only MODFLOW, but for any modeling package, for Windows, Unix Workstations, Macintosh and Power Macintosh. Its features include an unlimited number of windows, unlimited number of layers, undo/redo all commands, file compatibility across all platforms, and on-screen digitizer. It enables you to do your preprocessing in one friendly environment and export the data you linked to your grid and mesh to all your models. You can create a template for each of the models and save to disk.

Two pople have commented on Argus Open Numerical Environments.

MODCELL - Converts cell-by-cell flow term unformatted files to ASCII files so that these files can be examined. These files contain all terms from the unformatted files.
MODVEL - Uses unformatted head files from MODFLOW to produce unformatted files of 2-D ground-water velocity vectors for each model layer. A set of ground-water velocity vectors is automatically produced for each set of data in the unformatted head file.
MODLOCAL - Constructs localized MODFLOW models. It takes, as input, a complete set of MODFLOW package files for a regional model and creates a new, complete set for a model which includes an arbitrary, user-defined localized region.
MODGRAF - Provides graphics for MODFLOW and includes ground-water velocity vector capability. It automatically contours heads and drawdowns from each layer, stress period, and time step of the simulation. Both variable and constant stepsize grids may be used. MODGRAF can process and create contour plots for up to 100 sets of head or drawdown data in a single execution and save the results in a single file.
MODRET - Unsaturated and saturated infiltration from stormwater ponds using MODFLOW. MODRET calculates infiltration losses from stormwater retention/detention ponds in unconfined aquifers with a variety of utility modules that give versatility to the model. It also allows for generation of single watershed stormwater runoff hydrographs, routing of runoff hydrographs, specification of overflow devices, and ground-water elevation cross-sectional graphics.
MODCROS - Generates cross sections from MODFLOW. It graphically displays a cross section for a specified aquifer layer, stress period, and time step of a MODFLOW output data set and generates a cross section along any row or column of the model grid. It uses the BASIC data file, the Block Centered data file and the MODFLOW output data file to read the grid size and dimensions and the model output results.
MODPUMP - MODFLOW simulated pumping test model. It allows calculation of aquifer parameters for single or multiple layer aquifer systems by simulating field pumping test data. It allows calculation of hydraulic conductivity, storage coefficient, specific yield and vertical leakance for up to three-layer aquifer systems. The aquifer parameters are calculated by trial and error, using graphical data points matching techniques where the observed drawdown at various time periods from a field pumping test are graphically compared to MODFLOW simulated drawdown.
PEST - Parameter Estimation for Any Model. PEST creates a sophisticated nonlinear parameter estimator for not only MODFLOW, but for any model. PEST communicates with a model through the model's own input and output files. A model does not need to be adjusted, re-cast as a subroutine or even recompiled to be used with PEST. It implements a robust form of the Gauss-Marquardt-Levenberg method of parameter estimation. Its optimization algorithm includes a sophisticated derivatives calculator which allows successful parameter estimation, even for large numerical models.

One reader has made comments on MODFLOWP and PEST.

Two other MODFLOW-related model sold by the Scientific Software Group are "MODAIR AND P3DAIR - Simulate Air Flow Using MODFLOW"

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Reston, Va 20191