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 Ground-Water Availability in the United States (Circular 1323)

 CFP: Conduit Flow Process for MODFLOW-2005

 GSFLOW: A New Model for Simulation of Ground-Water and Surface-Water Interaction

 SEAWAT v4: Simulation of 3D Variable-Density Ground-Water Flow and Transport

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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 ground-water flow conditions by: (1) coupling the traditional ground-water 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.

Release History

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

Source Code and Documentation

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 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 as he is maintaining the user email list.bshoemak@usgs.gov

List of Reports & Articles

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

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