Groundwater Software MODFLOW-SURFACT Flow and Transport MODFLOW-SURFACT Flow and Transport is groundwater modeling software used to produce 3D finite-difference groundwater flow and transport models.
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.
$3995.00 USD
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.
Advanced Groundwater Flow and Transport Modeling Software based on 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
The powerful PCG5 solver1add-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 Transport2
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. For pricing please call (519) 746-1798. 2- MODFLOW-SURFACT's flow features are available to work within the Visual MODFLOW, Visual MODFLOW Pro, or Visual MODFLOW Premium modeling and simulation environment. For further details, please call (519) 746-1798 or write sws-sales@slb.com. Images seen on this page were created using Visual MODFLOW Premium and highlight MODFLOW-SURFACT flows capabilities
MODFLOW-SURFACT is a Registered Trademark of HydroGeoLogic Inc.
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
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
Professional Uses Of MODFLOW SURFACT Flow and Transport:
Extends physical modeling capabilities of MODFLOW (Vadose, Vapor Flow)
Greater stability, fast model convergence with complex conditions
Builds on state-of-the-art, mass-conservative, multi-component transport
Innovative handling of pumping wells screened across multiple model layers
Multiphase, Multicomponent Contaminant Transport with Biodegradation
Flow package is extended for rigorous unsaturated zone water flow modeling using Richard's equation, for saturated-unsaturated systems (air is treated passively).
Flow package is extended to simulate rigorous air phase flow including relative permeability functions for air and compressibility effects (water is treated passively).
New Newton-Raphson package with backtracking, NRB1, provides a robust alternative for highly non-linear situations, when time steps are exorbitantly small or steady-state solutions fail with MODFLOW's Picard-type iteration scheme.
Fractured porous media simulations with dual porosity and discrete fracture representations.
Transport Package additionally allows for multiphase transport of volatile contaminants, with advection and dispersion in the active phase, and diffusion, storage, and/or decay in the inactive phase.
Transport Package is further extended to simulate dissolution and volatilization of an immobile multi-component NAPL contaminant, with subsequent reduction and disappearance of NAPL saturations.
Complete consideration of above simulation options in computation speed and memory allocation.
ROBUSNESS & EFFICIENCY
Adaptive time stepping and output control package, ATO4, provides great robustness and efficiency in all flow simulations, cutting the time-step size when the simulation becomes difficult, and increasing it when the difficulty passes. It also provides improved organization and control of simulation output.
The included conjugate gradient solution package, PCG4, provides an alternative to the available solvers in MODFLOW while the powerful PCG5 solver add-on is up to 20 times faster thanks to its advanced computational techniques
CONTAMINANT TRANSPORT
Accurate, robust, and efficient mass-conservative transport solution schemes.
Numerical schemes, data input/output, grid considerations, and simulation control fully compatible with all MODFLOW and MODFLOW-SURFACT flow options.
Axi-symmetric option for quick analyses of slug tests or tracer tests.
Accommodates up to five contaminant species in a single simulation including first-order chain reactions which may occur due to radioactive decay, or biochemical transformation.
Provides linear or non-linear (Freundlich) equilibrium adsorption options.
Provides two, three, and four component dispersivity options for various anisotropic conditions.
Under isotropic conditions, the three and four dispersivity formulations collapse to Scheidegger's two component dispersivity equation.
Consistent transport solution options include: upstream, central, or mixed weighting for efficient solutions, or Total Variation Diminishing (TVD) schemes for extremely accurate, physically correct solutions.
Complete consideration of above simulation options in computation speed and memory allocation.
NUMERICAL SCHEMES FOR TRANSPORT
Finite difference spatial discretization compatible with MODFLOW's schemes.
Mass conservative solution scheme using primitive form of the transport equation.
Total Variation Diminishing (TVD) schemes for physically correct solutions, with adaptive temporal weighting (between Crank-Nicholson and fully implicit) for maximum accuracy.
Options also available for upstream, central or mixed spatial weighting.
Options also available for fully implicit to fully explicit temporal discretization.
Adaptive time stepping within transport to promote convergence or for stability requirements for explicit cases.
No numerical oscillations in space or time, or numerically induced mass appearance or disappearance.
DYNAMIC MEMORY ALLOCATION
Windows systems allocate available memory to all applications open on the computer. Efficient use of memory by MODFLOW- SURFACT maximizes available memory space for other user applications.
Due to dynamic allocation of memory, simulation problem dimensions are limited only by available computer memory, or prohibitively long simulation times for large, complex problems.
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Advanced contaminant transport & groundwater modeling software. 
Advanced contaminant transport & groundwater modeling software. 
Advanced contaminant transport & groundwater modeling software. 
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