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Notice: This USGS product has been superseded by a newer product. USGS no longer updates this page, but it may be useful as a reference or resource. To find the current core version of MODFLOW, please see

MODular three-dimensional finite-difference ground-water FLOW model--1996 updated version



Selection of the following options preceded by a binary icon retrieves a compressed UNIX tar file or a self-extracting DOS executable. A README file containing installation instructions is included with each of the software distribution files. There are separate README files for the UNIX and DOS distributions.

The Free Software Foundation's gunzip is necessary to uncompress the UNIX tar files available below. However, some World Wide Web browsers automatically uncompress retrieved files. Thus, running gunzip as stated in the installation instructions may be unnecessary.

MODFLOW-96 compiled for...

MODFLOW-96 source code for compilation under...

Preprocessors and postprocessors


The following reports documenting MODFLOW packages are available on-line. Select the "Summary of MODFLOW-96" link above to see a complete listing of USGS reports documenting the MODFLOW model. Due to the date of their publishing, many of the reports are not available in electronic form.

Point of contact for MODFLOW-96:

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

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