System Requirements and Installation
The pre- and post-processing GUI for MT3D 1.5 require Argus ONE version 
4.0 or later operating on Windows 95, or Windows NT. To run MODFLOW-96, 
you must have MODFLOW-96. To run MT3D 1.5 models you must have MT3D 1.5 
and a version of MODFLOW-96 that creates the input files for MT3D. The 
version of MODFLOW distributed by the USGS does not create the MT3D 
input files. A suitable version of MODFLOW can be downloaded from 
this site. MT3D 1.5 can be downloaded from 
http://hydro.geo.ua.edu/mt3d/mt3d150d.htm. The modifications to MODFLOW-96 
to allow it to write the MT3D input files are described in Appendix 1
of the MT3D GUI PIE documentation. 

If you already have the USGS MODFLOW PIE installed, you must first 
removing by removing its files from the ArgusPIE directory or one of 
its subdirectories. At the time this was written, the default location 
of the USGS MODFLOW PIE was the mfgui1.41 subdirectory of the ArgusPIE 
directory.

To install the PIE, download the PIE installer program and execute it. 
When prompted, select the directory in which Argus ONE is installed. 
The PIE will install files in subdirectories of the ArgusPIE and 
ArgusHELP directories and will create an install log in the directory 
in which Argus ONE is installed.

Previously, the MODFLOW post-processing and preprocessing PIEís were 
packaged in two separate files; MFGUI_10.DLL and MFPOST10.DLL. In this 
new version, they have been combined in a single file; MODFLOW.DLL. 
In addition, online help for the PIE is provided in a series of linked 
web pages. These web pages are not required for the PIE to work but 
may prove helpful in using the PIE. If you do not require them, you 
may delete them by deleting the MF_Help subdirectory of the ArgusHelp 
directory.

Both MODFLOW and MT3D must be compiled with the same (or compatible) 
compilers for MT3D to read the flow file produced by MODFLOW. In 
addition, pm.dll used by MT3D post-processing utility must be compiled 
with the same (or compatible) compiler as MT3D and MODFLOW for it to 
be able to read the concentration file created by MT3D. It must also 
export functions in pm.for to PostMT3D.exe which was written using 
Borland Delphi 3.0. Pm.dll was compiled with the Lahey Fortan 90 4.0 
compiler as was the version of MODFLOW at this site. The version of MT3D 
at http://hydro.geo.ua.edu/mt3d/mt3d150d.htm was compiled with a 
different but compatible Lahey Fortran compiler.