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

Advanced Groundwater Flow and Transport Modeling Software based on MODFLOW

MODFLOW-SURFACT Flow and Transport groundwater simulation software features many robust methods and enhanced simulation capabilities for handling complex saturated/unsaturated subsurface flow and transport processes. Based on the USGS modular groundwater flow model, MODFLOW.

Benefits of MODFLOW-SURFACT

  • Handles complete desaturation and resaturation of grid cells
  • Accurate delineation and tracking of water table position, taking into account flow in the unsaturated zone, delayed yield, and vertical flow components
  • Automatic and correct redistribution of the total flow rate of a well screened through multiple model layers when the upper cell(s) are pumped dry
  • Accommodation of wellbore storage and overpumped wells
  • Prevents water table buildup beyond a specified recharge-ponding elevation
  • Handling of seepage face boundary conditions
  • Adaptive time-stepping schemes automatically adjusts time-step size to the non-linearities of the system to optimize the solution stability
  • Robust and efficient Pre-conditioned Conjugate Gradient matrix solver
  • Capability of modeling unsaturated water or air movement
  • Enhanced Newton-Raphson linearization option increases robustness for unconfined and/or unsaturated flow conditions

Recent Additions

  • The powerful PCG5 solver add-on is up to 20 times faster than the PCG4 solver thanks to its advanced computational techniques
  • The Recharge Package (RSF4) has been modified to include zonal input of recharge with zonal recharge values provided via a separate recharge time-series (RTS) file that is independent of the stress-period setup for varying boundary conditions
  • The Evapotranspiration (ET) packages EVT and ETS1 (referred to as ET2 in MODFLOW-SURFACT) have been modified to include zonal input of ETmax values provided via a separate ET time-series (ETS) file that is independent of the stress-period setup for varying boundary conditions

MODFLOW-SURFACT Flow and Transport

  • Includes fracture well package (FWL4), new flow package (BCF4), recharge/seepage** face package (RSF4)
  • Includes new Adaptive Time Stepping and Output Control Package (ATO4)
  • Includes new Preconditioned Conjugate Gradient Package containing a new PCG matrix solver (PCG4)
  • Includes new Newton Raphson linearization package with backtracking (NRB1)
  • Simulate complete desaturation and saturation of grid blocks
  • Simulate unsaturated flow includes fractured flow and dual porosity
  • Includes solute transport, multiphase transport, NAPL dissolution and volatilization
  • Includes vapor flow
  • Accurate delineation and tracking of water table position, taking into account flow in the unsaturated zone, delayed yield, and vertical flow components
  • Automatic and correct redistribution of the total flow rate of a well screened through multiple model layers when the upper cell(s) are pumped dry
  • Accommodation of wellbore storage and overpumped wells
  • Prevents water table buildup beyond a specified recharge-ponding elevation
  • Handling of seepage face boundary conditions
  • Adaptive time-stepping schemes automatically adjusts time-step size to the non-linearities of the system to optimize the solution stability
  • Robust and efficient Pre-conditioned Conjugate Gradient matrix solver

1- PCG5 solver is an add-on to MODFLOW-SURFACT.

2- MODFLOW-SURFACT’s flow features are available to work within the Visual MODFLOW, Visual MODFLOW Pro, and Visual MODFLOW Premium products. For further details, please call (519) 746-1798 or email sales@waterloohydrogeologic.com.

Note: Transport packages are currently not supported in Visual MODFLOW (Flex or Classic Interfaces)

MODFLOW-SURFACT is developed and owned by and is a registered trademark of HydroGeoLogic (HGL)