New & Noteworthy
USGS Groundwater Watch
USGS maintains a network of active wells to provide basic statistics about groundwater levels.
USGS in Your State
USGS Water Science Centers are located in each state.
Other USGS Water Science Areas
Water Software > Groundwater Software > MODFLOW and Related Programs > MODFLOW-LGR
MODFLOW-LGR: MODFLOW-2005 with Local Grid Refinement
Overview of MODFLOW-LGR
A new version of MODFLOW, called MODFLOW-LGR (for Local Grid Refinement) was developed (Mehl and Hill, 2005) to support the use of locally refined grids to simulate groundwater flow. MODFLOW-LGR allows smaller parts of a larger model domain to be refined without refining the entire model. Mehl and Hill (2007) expanded the original scope of MODFLOW-LGR to include multiple areas of refinement within a single model domain. Mehl and Hill (2010) allows rivers simulated with the Streamflow-Routing Process (SFR) to be routed through locally refined grids. The current version (2013) couples grids using the ghost-node method rather than the shared node method (Mehl and Hill, 2013).
MODFLOW-LGR Information and Downloads
The current release of MODFLOW-LGR is version 2.0.0
Note: Users are encouraged to read the documents that are provided in the 'doc' directory of this software distribution.
Documentation of MODFLOW-LGR
- Mehl, S.W. and Hill, M.C., 2005, MODFLOW-2005, the U.S. Geological Survey modular ground-water model -- documentation of shared node local grid refinement (LGR) and the Boundary Flow and Head (BFH) Package: U.S. Geological Survey Techniques and Methods 6-A12, 68 p.
This report describes the theory and input instructions at the time of the initial MODFLOW-LGR v1.00 release.
- Online MODFLOW-LGR User's Guide
The User's Guide is not a tutorial and is primarily intended for those already familiar with MODFLOW. The Guide includes the most up-to-date instructions and related information for the current release of MODFLOW-LGR. The Guide can be used as a quick way of looking up input formats and USGS options available.
- Mehl, S.W. and Hill, M.C., 2007, MODFLOW-2005, the U.S. Geological Survey modular ground-water model -- documentation of the multiple-refined-areas capability of local grid refinement (LGR) and the Boundary Flow and Head (BFH) Package: U.S. Geological Survey Techniques and Methods 6-A21. 13 p.
This report documents the addition of the multiple-refined-areas capability to shared node Local Grid Refinement (LGR) and Boundary Flow and Head (BFH) Package of MODFLOW-2005.
- Mehl, S.W. and Hill, M.C., 2010, MODFLOW-LGR -- Modifications to the Streamflow- Routing Package (SFR2) to Route Streamflow through Locally Refined Grids: U.S. Geological Survey Techniques and Methods 6-A34, 15 p.
This report documents modifications to the Streamflow-Routing Package (SFR2) to route streamflow through grids constructed using the multiple-refined-areas capability of shared node Local Grid Refinement (LGR) of MODFLOW-2005.
- Mehl, S.W., and Hill, M.C., 2013, MODFLOW-LGR -- Documentation of ghost node local grid refinement (LGR2) for multiple areas and the boundary flow and head (BFH2) package: U.S. Geological Survey Techniques and Methods 6-A44, 43 p.
This report documents the addition of ghost node Local Grid Refinement (LGR2) to MODFLOW-2005. LGR2 provides the capability to simulate groundwater flow using multiple block-shaped higher-resolution local grids (a child model) within a coarser-grid parent model.
- Video: MODFLOW-LGR with ModelMuse
ModelMuse is a graphical user interface (GUI) that can be used with MODFLOW-LGR. The video uses the older shared-node method that uses half cells at the interface. The newer ghost node method uses full cells along the interface, and is more consistent with how local grid refinement is done in MODFLOW-USG.
The following software is not actively supported by the USGS. The software has been superseded by the current release provided above. The software version below is provided online for historical reference only, and the files may contain outdated information or broken links.
Example Applications of MODFLOW-LGR
- Borsi, I., Rossetto, R., Schifani, C., and Hill, M.C., 2013, Modeling unsaturated zone flow and runoff processes by integrating MODFLOW-LGR and VSF, and creating the new CFL package : Journal of Hydrology, v. 488 p. 33-47.
- Hanson, R.T., Kauffman, L.K., Hill, M.C., Dickinson, J.E., and Mehl, S.W., 2013, Advective transport observations with MODPATH-OBS -- Documentation of the MODPATH observation process, using four types of observations and Predictions: U.S. Geological Survey Techniques and Methods6-A33, 96 p.
- Heywood, C.E., 2013, Simulations of groundwater flow, transport, and age in Albuquerque, New Mexico, for a study of transport of anthropogenic and natural contaminants (TANC) to public-supply wells: U.S. Geological Survey Scientific Investigations Report 2012-5242, 51 p.
- Vilhelmsen, T.N., Christensen, S., and Mehl, S.W., 2012, Evaluation of MODFLOW-LGR in connection with a synthetic regional-scale model : Ground Water. v. 50, no. 1, p. 118-132. doi: 10.1111/j.1745-6584.2011.00826.x.
- 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 using MODFLOW-LGR: U.S. Geological Survey Techniques and Methods 6-A38, 42 p.
- Hoard, C.J., 2010, Implementation of local grid refinement (LGR) for the Lake Michigan Basin regional groundwater-flow model: U.S. Geological Survey Scientific Investigations Report 2010-5117, 25 p.
- Ahlfeld, D.P., Baker, K.M., and Barlow, P.M., 2009, GWM-2005 -- A Groundwater-Management Process for MODFLOW-2005 with Local Grid Refinement (LGR) capability: U.S. Geological Survey Techniques and Methods 6-A33, 65 p.
Examples of current USGS projects using MODFLOW-LGR include:
Point of Contact
Support is provided for correcting bugs and clarification of how MODFLOW-LGR is intended to work. Only limited assistance can be provided for applying MODFLOW-LGR to specific problems by contacting the points of contact listed below:
U.S. Geological Survey
Office of Groundwater
411 National Center
12201 Sunrise Valley Drive
Reston, VA 20192
Related USGS Software Resources
USGS computer programs related to MODFLOW-LGR include the following:
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
Please refer to the USGS Software User Rights Notice for complete use, copyright, and distribution information. The USGS provides no warranty, expressed or implied, as to the correctness of the furnished software or the suitability for any purpose. The software has been tested, but as with any complex software, there could be undetected errors. Users who find errors are requested to report them to the USGS.
References to non-USGS products, trade names, and (or) services are provided for information purposes only and do not constitute endorsement or warranty, express or implied, by the USGS, U.S. Department of Interior, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
Note: Some or all of this information 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 the free Adobe Reader from the Adobe web site. Visit http://www.adobe.com/accessibility/ for free tools that allow visually impaired users to read PDF files.