MFI2005 U.S. Geological Survey ABSTRACT MFI2005 is a data input (entry) program for the U.S. Geological Survey modular three-dimensional finite-difference ground-water model called MODFLOW-2005. Data for MODPATH, a particle tracking program for use with MODFLOW, can also be entered using MFI2005. MFI2005 is designed to be easy to use. It can also be used in conjunction with other programs so that the different parts of a model data set can be entered using the most suitable program. Data are entered in MFI2005 interactively through a series of display screens. HISTORY Version 1.0 4/29/2010 - Initial version of MFI2005 SYSTEM REQUIREMENTS MFI2005 runs on personal computers that use one of the windows operating systems. DOCUMENTATION Harbaugh, A.W., 2010, A data-input program (MFI2005) for the U.S. Geological Survey modular groundwater model (MODFLOW-2005) and parameter estimation program (UCODE_2005): U.S. Geological Survey Open-File Report 2010–1057, 35 p. CONTACTS U.S. Geological Survey Office of Groundwater Arlen Harbaugh 411 National Center Reston, VA 20192 harbaugh@usgs.gov