Modflow-Surfact

Modflow-Surfact is a comprehensive three-dimensional finite-difference flow and contaminant transport modeling code based on the USGS modular groundwater flow code, MODFLOW. Using new computational modules based on robust, efficient, and mass-conserving algorithms, Modflow-Surfact overcomes limitations and eliminates restrictions associated with Modflow and its current transport counterparts. Examples include rewetting of drained cells, handling of pumping wells, solute mass balance problems, numerical dispersion and oscillations, and the implicit assumption of the negligible impact of transient flow storage effects on transport. Modflow-Surfact is fully compatible with MODFLOW. This feature allows the user to import any previously created MODFLOW files with minimal effort, and take advantage of MODFLOW Graphical User Interface (GUI) tools such as GroundWater Vistas and Visual MODFLOW.