Groundwater Software MODFLOW-SURFACT Flow MODFLOW-SURFACT Flow is groundwater modeling software used to produce 3D finite-difference groundwater flow and transport models.
MODFLOW-SURFACT Flow 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.
$1890.00 USD
MODFLOW-SURFACT Flow 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.
Dynamic memory allocation permits unlimited problem dimensions
Modular structure allows further development of additional simulation capabilities to provide a comprehensive, general purpose simulator within the MODFLOW framework
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
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
Dynamic memory allocation permits unlimited problem dimensions
Modular structure allows further development of additional simulation capabilities to provide a comprehensive, general purpose simulator within the MODFLOW framework
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
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.
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. 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
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. 
Theory and Hands-on Applications using MODFLOW-2000, MODPATH, MT3D, & WinPEST 
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