MODFLOW-SURFACT™ is one of the most comprehensive flow and transport models available.


MODFLOW-SURFACT is a powerful 3D finite-difference flow and transport modeling code for analyzing subsurface systems. It offers substantial advancements over public-domain versions of MODFLOW. For example, MODFLOW-SURFACT addresses rewetting of drained cell, handling of pumping wells, solute transport problems, numerical dispersion and oscillations, and impacts of transient flow storage effects on transport. MODFLOW-SURFACT includes advanced computational modules that are based on robust, efficient, mass-conserving algorithms, making it faster and more accurate than its transport modeling counterparts.

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Advanced Features:

  • Robust PCG5 Module up to 20 times faster than PCG4 solver. (Developed by Dr. Peter Forsyth at the University of Waterloo.)
  • Density-dependent flow and transport
  • Time-varying material properties
  • Fully and variably saturated flow and transport modeling
  • Reaction Module with several reactions of mobile and immobile chemical component species—invaluable for modeling biodegradation of industrial contaminants
  • Curvilinear Grid option for non-rectangular grids in the areal plane
  • Prescribed-ponding recharge and seepage face conditions, as well as delayed yield
  • Adaptive time-stepping to promote stability and convergence for flow and transport simulations
  • Recharge package that eliminates unphysical predictions for unconfined systems
  • Total Variation Diminishing (TVD) schemes for no-oscillation transport solutions with adaptive temporal weighting
  • Vapor flow for soil vapor extraction (SVE) and air sparging simulations
  • Multiphase, multicomponent contaminant transport modeling with biodegradation
  • Robust and efficient Newton-Raphson solver for nonlinear problems
  • Fractured porous media simulation with dual porosity

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