Overview

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 solver¹ 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 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.

© 2014 Schlumberger Limited.  All rights reserved.  Privacy