USGS Groundwater Information
MODFLOW-2005: USGS three-dimensional finite-difference ground-water model
Overview of MODFLOW-2005
Note: MODFLOW 6 is presently the core MODFLOW version distributed by the USGS, but MODFLOW-2005 (the previous core version) is still actively maintained and supported.
MODFLOW-2005 (Harbaugh, 2005) simulates steady and nonsteady flow in an irregularly shaped flow system in which aquifer layers can be confined, unconfined, or a combination of confined and unconfined. Flow from external stresses, such as flow to wells, areal recharge, evapotranspiration, flow to drains, and flow through river beds, can be simulated. Hydraulic conductivities or transmissivities for any layer may differ spatially and be anisotropic (restricted to having the principal directions aligned with the grid axes), and the storage coefficient may be heterogeneous. Specified head and specified flux boundaries can be simulated as can a head dependent flux across the model's outer boundary that allows water to be supplied to a boundary block in the modeled area at a rate proportional to the current head difference between a "source" of water outside the modeled area and the boundary block.
MODFLOW-2005, v. 1.12.00
The current version of MODFLOW-2005 is v.1.12.00, released February 3, 2017. For a complete explanation of the changes in this release and a history of past releases, refer to:
Downloads and Documentation
Note: Users are encouraged to read the documents that are provided in the 'doc' directory of this software distribution.
Documentation of MODFLOW-2005
Documentation of MODFLOW Processes and Packages
The table below provides quick access to the key documentation for MODFLOW processes and packages:
Note: Click on a column header to sort the table by that column.
Previous Core Versions
How to Cite
This USGS software has two citations associated with it.
In instances where an author is citing use of this software, it would be appropriate to cite both the report documenting the code and the specific software release version that was used.
Report Citation for MODFLOW-2005
Harbaugh, A.W., 2005, MODFLOW-2005, the U.S. Geological Survey modular ground-water model -- the Ground-Water Flow Process: U.S. Geological Survey Techniques and Methods 6-A16.
Software/Code Citation for MODFLOW-2005 v1.12.00
Harbaugh, A.W., Langevin, C.D., Hughes, J.D., Niswonger, R.N., and Konikow, L. F., 2017, MODFLOW-2005 version 1.12.00, the U.S. Geological Survey modular groundwater model: U.S. Geological Survey Software Release, 03 February 2017, http://dx.doi.org/10.5066/F7RF5S7G
Point of Contact
Support is provided for correcting bugs and clarification of how MODFLOW-2005 is intended to work. Only limited assistance can be provided for applying MODFLOW-2005 to specific problems by contacting the point of contact listed below:
U.S. Geological Survey
Other USGS Groundwater Software
The USGS develops groundwater, 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.
Software License and Purchase Information
This software is a product of the U.S. Geological Survey, which is part of the U.S. Government.
This software is freely distributed. There is no fee to download and (or) use this software.
Users do not need a license or permission from the USGS to use this software. Users can download and install as many copies of the software as they need.
As a work of the United States Government, this USGS product is in the public domain within the United States. You can copy, modify, distribute, and perform the work, even for commercial purposes, all without asking permission. Additionally, USGS waives copyright and related rights in the work worldwide through CC0 1.0 Universal Public Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/ ).
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