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USGS Water Science Centers are located in each state.

There is a USGS Water Science Center office in each State. Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Provided in cooperation with New Jersey Department of Environmental Protection

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Program to Maintain and Update Groundwater Models
MODFLOW Requirements

System Requirements

To run a U.S. Geological Survey (USGS) archived model on your system, the appropriate MODFLOW (either MODFLOW-2000 or MODFLOW-2005) groundwater model code must be compiled on a computer system with adequate memory. The MODFLOW model code can be downloaded from the USGS Office of Groundwater web site at

After the model code is downloaded and compile on your system, use the test problem provided by MODFLOW to ensure the program is working correctly. Approximately 105 megabytes of disc space is needed for the MODFLOW program.

All archived models have been tested and successfully run on the Windows 7, 64-bit operating system.

Pre- and post-processors that are used to assist in data management--such as MFI2K, ZONEBUDGET, or MODPATH--also are available from the Office of Groundwater web site. MFI2K, a preprocessor for MODFLOW-2000, runs only on personal computers using one of the Windows operating systems. Some post processors, such as ZONEBUDGET and MODPATH, may need to be re-dimensioned and re-compiled in order to process the large data arrays used in the larger models.

The USGS makes no claims that that these model-input files will be consistent with any other groundwater modeling software. Use of any other pre- and post-processors are not supported.

Support is provided for correcting errors in the model-input data sets for the archived models. Only limited assistance can be provided for applying this model to specific problems. Errors in the model-input files can be reported by email to

User Requirements

To use the models most effectively, the user should have a detailed understanding of hydrology, groundwater flow, groundwater-flow modeling, FORTRAN, and MODFLOW. Specific information pertaining to the model is available in the README files downloaded with the model-input data.

The USGS assumes no responsibility for changes made to the data-input files. If changes are made to the input files, the user is responsible for documenting the changes and justifying the results and conclusions.

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Page Last Modified: Thursday, 01-Dec-2016 09:54:18 EST