Rationale for Selecting MODFLOW-SURFACT™

Key Discriminators of  MODFLOW-SURFACT™
Worldwide Acceptance
✔  MODFLOW-SURFACT™ has been licensed nationwide in the U.S. and worldwide in over 50 countries.
✔ Modeling results have been accepted by state and federal regulators for planning, design, and implementation of remedies.
Full Capabilities & Rigorous QA/QC Documentation
✔ Single code with full integration of flow and transport modules offering convenience and avoiding input/output error in conducting transient and density- dependent simulations. 
✔ Includes a wide variety of flow and transport simulation capabilities for all levels of site complexity.
✔ Comes with a fully documented user’s manual that has been subjected to rigorous quality assurance/quality control (QA/QC) and includes a full suite of example problems.
Ease of Use, Flexibility, and Computational Robustness
✔ Offers compatibility with well-recognized, industry standard graphical user interfaces (GUIs) and has been well tested on a wide range of simulation capabilities.
✔ Utilizes structured block-centered rectangular grids (in preference to the unstructured grid (MODFLOW-USG) approach with separate flow and transport packages) to offer an intuitive approach for entering model information and efficiently debugging problems (without unnecessary frustration) and to accommodate grid refinement for sub-models using telescopic mesh refinement (TMR) to target specific areas.
✔ Provides robust and efficient matrix solvers, including the PCG5 solver developed by Dr. Peter Forsyth at the University of Waterloo, that allow large-scale simulations with millions of nodes in serial or in parallel on PC clusters or via a Cloud platform.
Credible Technical Support Team
✔ Offers the support of an integrated technical support team with recognized experts in model development, GIS application, parameter estimation, calibration, sensitivity and uncertainty analysis, and 3-D visualization.
✔ Led by Dr. Varut (Dua) Guvanasen, HGL Principal Engineer with extensive modeling experience, Professional Engineer (P.E.) license and Engineer of Record (EOR) qualifications, the HGL integrated technical team has established a strong record of customer satisfaction over the last two decades.
Capabilities for Extended Applications
✔ Provides capability to perform integrated hydrologic model (IHM) simulations via direct linkage to MODHMS®.
✔ Provides capability to perform multiphase flow and transport simulations via direct linkage to CompFlow.  
✔ Provides capability to perform contaminant plume boundary delineation and optimization of monitoring well network via direct linkage to PlumeSeeker™.
✔ Provides capability to perform computational optimization of  groundwater remedial system design and operation via direct linkage to PBMO™.
✔ Provides specialized decision support capability for PFAS response and stakeholder interaction by being an essential component of PFAS-DSS.
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