mfi(1) U.S. Geological Survey (wrdapp) mfi(1) NAME mfi - Data input program for MODFLOW, MODPATH, and MOC3D SYNOPSIS mfi [dataset] ABSTRACT MFI is a data input (entry) program for the U.S. Geological Survey modular three-dimensional finite-difference ground-water flow model commonly referred to as MODFLOW. Data for MODPATH, a particle tracking program for use with MODFLOW, can also be entered using MFI. MFI is designed to be easy to use and portable. 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 MFI interactively through a series of display screens. MFI interfaces to a commercial spreadsheet program for entering two-dimensional arrays and lists of stress data. This report provides instructions for using MFI and information about making MFI run on different computers. OPTIONS dataset The name of the dataset to be created/updated by MFI. It may consist of up to 8 characters and must represent a valid filename for the operating system used. If the dataset name is not entered as part of the command, then the first screen will prompt for it. Output filenames for running MODFLOW are generated as the dataset name followed by a dot and a 2- or 3-character suffix. The following suffixes define some of the files that MFI can generate: dataset.nam - Names of all files used in the MODFLOW simulation. dataset.bas - Basic Package file of MODFLOW. dataset.bcf - BCF Package file for MODFLOW. If the file dataset.nam exists, it is read and the specified files are read and can be updated. HISTORY Version 2.3 1996/12/06 - Revised version that includes support for the following: STR Package -- MODFLOW Stream Package MODFLOW-96 -- Updated version of MODFLOW MOC-3D -- Addition of Method of Characteristics Transport capability to MODFLOW Version 1.1 1994/11/22 - Initial version of MFI DATA REQUIREMENTS The data requirements are the same as for MODFLOW; the system being simulated must be described. OUTPUT OPTIONS The output consists of a set of files that can be used to run MODFLOW, including use of the Method of Characteristics Transport 7 Jul 1998 1 mfi(1) U.S. Geological Survey (wrdapp) mfi(1) capability. If desired, MODPATH files can also be prepared. SYSTEM REQUIREMENTS MFI is written in Fortran 77 with the following extensions: use of include files, greater than 19 continuation lines, use of adjustable size concatenation of strings, use of integer*2 declarations, use of nonstandard intrinsic functions (GETARG and SYSTEM), and variable names longer than 6 characters. To compile MFI the AIDE interactive library (AIDE, ADWDM, and UTIL libraries from the LIB software distribution) is required. For execution either a Lotus 123 revision 2 or Tactitian compatible spreadsheet is required. Generally, the program is easily installed on most computer systems. The code has been used on UNIX-based computers and DOS-based 386 or greater computers having a math coprocessor and 4 mb of memory. APPLICATIONS MFI should be useful for preparing MODFLOW and MODPATH input data in a wide variety of situations. DOCUMENTATION Harbaugh, A.W., 1994, A data input program (MFI) for the U.S. Geological Survey modular finite-difference ground-water flow model: U.S. Geological Survey Open-File Report 94-468, 24 p. The following information describes changes made to MFI after the published documentation was released. MFI Version 2.3 includes the following enhancements: 1. Main menu item ABORT has been added. This allows a user to exit from MFI without saving any data. Previously the only way a user could exit without saving data was to use the operating system abort command, which could leave some of the files not properly closed. 2. Support for the D4 Direct solver has been added. This capability is accessed through a new option within the SOLVER option. The D4 solver is documented in "Direct Solution Package Based on Alternating Diagonal Ordering for the U.S. Geological Survey Modular Finite-Difference Ground-Water Flow Model," U.S. Geological Survey Open-File Report 95-288 by Arlen W. Harbaugh. 3. Support for the STR Package has been added. This capability is accessed through a new option within the STRESS option. The STR Package is documented in "Documentation of a Computer Program to Simulate Stream-Aquifer Relations Using a Modular, Finite- Difference, Ground-Water Flow Model," U.S. Geological Survey Open-File Report 88-729 by David E. Prudic. 4. Support for MODFLOW-96 has been added. MODFLOW-96 is an update to MODFLOW documented in "User's Documentation for MODFLOW-96, An Update to the U.S. Geological Survey Modular Finite-Difference Ground-Water Flow Model," U.S. Geological Survey Open-File Report 96-485 by Arlen W. Harbaugh and Michael G. McDonald. 7 Jul 1998 2 mfi(1) U.S. Geological Survey (wrdapp) mfi(1) MFI version 2.3 can write output files that make use of the new options of MODFLOW-96 or it can write files exactly as required by the original MODFLOW. When a new model data set is created, the screen that is used to specify the grid dimensions has a new field allowing the choice of whether to write output for MODFLOW-88 or MODFLOW-96. For an existing data set, MFI starts by setting the type of output based on the use of the new "FREE" option in MODFLOW-96. That is, if the data set includes the "FREE" option in the 4th record of the BAS Package input file, the data set is assumed to be a MODFLOW-96 data set and is read using free format; further, the edited data set will be written using all of the MODFLOW-96 options that are applicable to that data set. If "FREE" is not found in the BAS Package file, fixed format input will be used and a MODFLOW-88 fixed format data set will be written. An option has been added to the MISCELLANEOUS screen of the Basic Package menu that allows the type of output to be switched at any time within MFI. 5. Support for the Method of Characteristics Transport option (MOC3D) has been added. This capability is accessed through a new MOC3D option in the MAIN menu. MOC3D is documented in "A three-Dimensional Method-of-Characteristics Solute-Transport Model (MOC3D)," U.S. Geological Survey Water-Resources Investigations Report 96-4267 by Leonard F. Konikow, Daniel J. Goode, and George Z. Hornberger. TRAINING There is no separate training for using MFI, but MFI is used in the course Modeling of Ground-Water Flow Using Finite-Difference Methods (GW2096TC), offered annually at the USGS National Training Center. CONTACTS Operation: U.S. Geological Survey Office of Ground Water Arlen Harbaugh 411 National Center Reston, VA 20192 harbaugh@usgs.gov Distribution: U.S. Geological Survey Hydrologic Analysis Software Support Program 437 National Center Reston, VA 20192 h2osoft@usgs.gov Official versions of U.S. Geological Survey water-resources analysis software are available for electronic retrieval via the World Wide Web (WWW) at: http://water.usgs.gov/software/ 7 Jul 1998 3 mfi(1) U.S. Geological Survey (wrdapp) mfi(1) and via anonymous File Transfer Protocol (FTP) from: water.usgs.gov (path: /pub/software). The WWW page and anonymous FTP directory from which the MFI software can be retrieved are, respectively: http://water.usgs.gov/software/mfi.html --and-- /pub/software/ground_water/mfi If you would like to obtain the price of and (or) order paper copies of USGS reports, contact the USGS Branch of Information Services at: U.S. Geological Survey Branch of Information Services Denver Federal Center, Box 25286 Denver CO 80225-0286 To inquire about Open-File Reports or Water-Resources Investigations Reports: Tel: 303-202-4210; Fax 303-202-4695 To inquire about other USGS reports: Tel: 303-202-4700; Fax 303-202-4693 SEE ALSO contour(1) - A contouring program for gridded data moc3d(1) - Three-dimensional method-of-characteristics ground-water flow and transport model modflow(1) - Modular three-dimensional finite-difference ground-water flow model modpath(1) - Particle-tracking postprocessor program for the modular three-dimensional finite difference ground-water flow model 7 Jul 1998 4