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Appendix F: MODFLOW-96

The forward model MODFLOW-96 handles one, two, and three-dimensional groundwater flow scenarios. This appendix is intended to discuss MODFLOW-96 features that are relevant to MAD#. See its website for more information on the software itself.

Origin convention

The geometry in MODFLOW-96 is a vertical stack of rectangular grids with (row=1, column=1) in the top left corner of the grid. However, the coordinate system has (x=0m, y=0m) in the bottom left. MAD#’s origin (both grid and coordinate) is in the bottom left corner. Always use MAD#’s row and column convention when assigning values in MAD#. The driver will handle the conversion to MODFLOW-96’s system. 

Supported geometries

The current version of MAD# supports 1D, 2D, and 3D MODFLOW-96 projects with regular grids.


The versions of PMWIN and MODFLOW supported do not specify length units and thus MAD# cannot display length units for projects with this forward model. The length unit will be listed as ‘undefined’.

Recommended GUI

The GUI used to generate MODFLOW-96 forward models for testing of MAD# was PMWIN 5.3.3 (Chiang & Kinzelbach, 1991).

Last edited Aug 13, 2014 at 9:42 PM by segej87, version 2


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