GROUND WATER--Release of two computer programs for use with MODFLOW In Reply Refer To: December 1, 1994 Mail Stop 411 OFFICE OF GROUND WATER TECHNICAL MEMORANDUM NO. 95.01 Subject: GROUND WATER--Release of two computer programs for use with MODFLOW The purpose of this memorandum is to distribute documentation for two new programs for use with the ground-water flow model, MODFLOW. We recommend that these reports be brought to the attention of technical and management personnel concerned with ground-water modeling studies. Additional copies of the reports are available from the Office of Ground Water. MODPATH/MODPATH-PLOT, Version 3 MODPATH is a particle tracking program for use with MODFLOW; MODPATH-PLOT displays the results from MODPATH. The new versions of MODPATH and MODPATH-PLOT add the ability to do particle tracking for transient simulations. In addition, the graphical capabilities of MODPATH-PLOT have been significantly enhanced. For example, the ability to draw dipping and variable- thickness layers has been added for cross sectional plots. These programs are documented in Open-File Report 94-464, "User's Guide for MODPATH/MODPATH-PLOT, Version 3: A Particle Tracking Post-Processing Package for MODFLOW, the U.S. Geological Survey Finite-Difference Ground-Water Flow Model" by David W. Pollock. MFI MFI is an interactive data input program for MODFLOW and MODPATH. MFI will run on the Data General workstations as well as on personal computers. Array data are entered by using commercial spreadsheet software. On Data General workstations, the Tactician spreadsheet program is used. By having one program prepare data for both MODFLOW and MODPATH, duplicate entry of the shared data is avoided. MFI is documented in Open-File Report 94-468, "A Data Input Program (MFI) for the U.S. Geological Survey Modular Finite- Difference Ground-Water Flow Model" by Arlen Harbaugh. Obtaining the programs The Hydrologic Analysis Support Section (HASS) is handling the distribution of MODPATH and MFI within the Water Resources Division. To obtain the programs for use on Data General computers, connect to hassrvares.er.usgs.gov/ by anonymous ftp, and change the current directory to pub/GW. For MODPATH, retrieve files mpath30.tar.Z and readme.mpath30. For MFI, retrieve files mfi.tar.Z and readme.mfi. The readme files contain instructions for installing the programs. If there are problems installing the programs, contact HASS by electronic mail (wrdapp) or by telephone (Steve Regan 703 648-5896). For those who may want to port MODPATH to other computers, a generic version of the source code is available as Open-File Report 94-463, "Source Code and Ancillary Data Files for the MODPATH Particle Tracking Package of the Ground-Water Flow Model MODFLOW--Version 3, Release 1" by David W. Pollock. Note that because MODPATH-PLOT is a graphical program, porting is not generally easy. A Graphical Kernel System (GKS) library is required. To obtain Open-File Report 94-463, contact David Pollock by electronic mail (dwpolloc) or by telephone (703 648-5007). To obtain MFI for use on personal computers, contact Arlen Harbaugh by electronic mail (harbaugh) or by telephone (703 648-5615). /s/ William M. Alley Chief, Office of Ground Water 2 Attachments Distribution: A, B, PO, and S (memo only) FO (memo and reports)