r.gmtg
The groundwater modelling tool for GRASS (r.gmtg) is a module for the GRASS GIS that links this GIS with the finite difference groundwater flow model MODFLOW. The current version works with GRASS 5.4 and MODFLOW 96 (a recent version, not the one from 1996) but current work is being done to develop a new version for GRASS 6.0 and MODFLOW 2000.
The new version (r.gmtgs) will read data from PostgreSQL (e.g. information for wells) to develop groundwater flow models. This is quite handy to determine from which model layer a well is extracting water from. The r.gmtg module can be used for both steady state and transient simulation of multilayer models.
Requirements
To run r.gmtg, a FORTRAN and a C compiler are needed In addition you need the MODFLOW version available from this web page and GRASS 5.4. The module has been tested on Linux not on Cygwin.
Tutorial
A brief tutorial can be downloaded here while the data can be downloaded here .
Download r.gmtg
Download the source code here and another file to read MODFLOW's output here .
Download MODFLOW for r.gmtg
The original MODFLOW-96 version available from the USGS was slightly modified in order to work with r.gmtg. This modified version can be downloaded here .