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U.S. Geological Survey Techniques and Methods 6-A38

Prepared in cooperation with the U.S. Department of Energy

MODPATH-LGR—Documentation of a Computer Program for Particle Tracking in Shared-Node Locally Refined Grids by using MODFLOW-LGR

By Jesse E. Dickinson, R.T. Hanson, Steffen W. Mehl, and Mary C. Hill

Thumbnail of and link to report PDF (2.4 MB)Preface

The computer program described in this report, MODPATH-LGR, is designed to allow simulation of particle tracking in locally refined grids. The locally refined grids are simulated by using MODFLOW-LGR, which is based on MODFLOW-2005, the three-dimensional groundwater-flow model published by the U.S. Geological Survey. The documentation includes brief descriptions of the methods used and detailed descriptions of the required input files and how the output files are typically used.

The code for this model is available for downloading from the World Wide Web from a U.S. Geological Survey software repository. The repository is accessible from the U.S. Geological Survey Water Resources Information Web page at

The performance of the MODPATH-LGR program has been tested in a variety of applications. Future applications, however, might reveal errors that were not detected in the test simulations. Users are requested to notify the U.S. Geological Survey of any errors found in this document or the computer program by using the email address available on the Web site. Updates might occasionally be made to this document and to the MODPATH-LGR program, and users should check the Web site periodically.

  • This report is available only on the Web.

For additional information contact:
Office information, Arizona Water Science Center
U.S. Geological Survey
520 N. Park Avenue
Tucson, AZ 85719

This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Dickinson, J.E., Hanson, R.T., Mehl, S.W., and Hill, M.C., 2011, MODPATH-LGR; documentation of a computer program for particle tracking in shared-node locally refined grids by using MODFLOW-LGR: U.S. Geological Survey Techniques and Methods 6-A38, 42 p.





Overview of Steps for Running MODPATH-LGR

Tracking Particles through Locally Refined Models

Example Problems

Uses and Limitations


References Cited

three appendixes

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