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CFP: Documentation of a Conduit Flow Process for MODFLOW-2005

By W. Barclay Shoemaker (U.S. Geological Survey, Fort Lauderdale, Florida),
Eve L. Kuniansky (U.S. Geological Survey, Norcross, Georgia),
Steffen Birk (Karl-Franzenz University of Graz, Austria),
Sebastian Bauer (Eberhard-Karls University of Tubingen, Germany),
Eric D. Swain (U.S. Geological Survey, Fort Lauderdale, Florida)

Overview

The conduit flow process for MODFLOW-2005 (CFP) has the ability to simulate turbulent or laminar groundwater flow conditions by:

1. coupling the traditional groundwater flow equation with formulations for a discrete network of cylindrical pipes (Mode 1, CFPM1),
2. inserting a high-conductivity flow layer that can switch between laminar and turbulent flow (Mode 2, CFPM2), or
3. simultaneously coupling a discrete pipe network while inserting a high-conductivity flow layer that can switch between laminar and turbulent flow (Mode 3, CFPM3).

Conduit flow pipes (CFPM1) may represent dissolution or biological burrowing features in carbonate aquifers, voids in fractured rock, and/or lava tubes in basaltic aquifers and can be fully or partially saturated under laminar or turbulent flow conditions. Preferential flow layers (CFPM2) may represent:

1. a porous media where turbulent flow is suspected to occur under the observed hydraulic gradients;
2. a single secondary porosity subsurface feature, such as a well-defined laterally extensive underground cave; or
3. a horizontal preferential flow layer consisting of many interconnected voids. In this second case, the input data are effective parameters, such as a very high hydraulic conductivity, representing multiple features.

The Conduit Flow Process for MODFLOW-2005 was developed with the support of the USGS Groundwater Resources Program.

Release History

First official release version 1.0 was released for publication April 14, 2008.

Current version 1.8.00 was released for publication February 23, 2011. Refer to the release.txt in the download file for complete release history.

Source Code and Documentation

Download CFP version 1.8 (13.5MB ZIP file). File includes:

• Release history (release.txt)
• Installation instructions (readme.txt)
• Source code (mf2005cfp.exe)
• Examples, documentation, and more

A list of reports & articles is also available.

Points of Contact and Support

Support is provided for correcting bugs and clarification of how the code is intended to work. Only limited assistance can be provided for applying CFP to specific problems by contacting USGS online or by directing correspondence to the points of contact listed below.

User Email List

If you want to be alerted to updates in the CFP, please contact W. Barclay Shoemaker.

Other USGS Groundwater Software

The U.S. Geological Survey (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.