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Water Software > Groundwater Software > MODFLOW and Related Programs > MODPATH

MODPATH: A Particle-Tracking Model for MODFLOW

MODPATH Version 6 Overview

[Image: Cover of software documentation report. ]

MODPATH is a particle-tracking post-processing model that computes three-dimensional flow paths using output from groundwater-flow simulations based on MODFLOW, the U.S. Geological Survey (USGS) finite-difference groundwater flow model. The program uses a semianalytical particle-tracking scheme that allows an analytical expression of a particle's flow path to be obtained within each finite-difference grid cell. A particle's path is computed by tracking the particle from one cell to the next until it reaches a boundary, an internal sink/source, or satisfies another termination criterion.

Data input to MODPATH consists of a combination of MODFLOW input data files, MODFLOW head and flow output files, and other input files specific to MODPATH. Output from MODPATH consists of several output files, including a number of particle coordinate output files intended to serve as input data for other programs that process, analyze, and display the results in various ways.

MODPATH is written in FORTRAN and can be compiled by any FORTRAN compiler that fully supports FORTRAN-2003 or by most commercially available FORTRAN-95 compilers that support the major FORTRAN-2003 language extensions.

What's New in Version 6

MODPATH Version 6 is more efficient and easier to use than previous versions of MODPATH. The changes to MODPATH Version 6 also provide an improved code base for incorporating future changes. The major changes to MODPATH Version 6 include:

  • streamlined and simplified data input that makes pre-processor development and data management easier.
  • improved performance for particle-tracking simulations based on transient MODFLOW simulations.
  • additional attributes for particle-tracking output files that provide more information for post-processing applications.
  • improved support for double-precision calculations.
  • a redesigned programming style that will make it easier to support local grid refinement (LGR) in future versions.

MODPATH Information and Downloads

MODPATH v6.0.01 was released August 24, 2012.

Additional Resources

  • MODPATH-LGR: MODPATH-LGR and MODPATH Version 6 are separate programs with their own distinct input and output structure. MODPATH-LGR is a variation of MODPATH Version 5 that has been modified to work with nested grid output produced by MODFLOW-LGR.

Point of Contact

Support is provided for correcting bugs and clarification of how MODPATH is intended to work. Only limited assistance can be provided for applying MODPATH to specific problems by contacting the point of contact listed below:

David Pollock
U.S. Geological Survey (USGS) Office of Groundwater
411 National Center
12201 Sunrise Valley Drive
Reston, VA 20192

Related USGS Software Resources

Other USGS Groundwater Software

The USGS develops groundwater RSS, water-quality, surface-water, and other water-resources software for use by the USGS in fulfilling its mission. Most of this software is available online for download at no charge.

Disclaimers and Notices

This software has been approved for release by the U.S. Geological Survey (USGS). Although the software has been subjected to rigorous review, the USGS reserves the right to update the software as needed pursuant to further analysis and review. No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. Furthermore, the software is released on condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from its authorized or unauthorized use. Also refer to the USGS Water Resources Software User Rights Notice for complete use, copyright, and distribution information.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

See also, USGS policy on linking to non-Federal web sites.

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