New Engines. The following SEAWAT flow packages are supported in Visual MODFLOW Flex:

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1 Visual MODFLOW Flex provides vibrant tools and time-saving workflow options, giving you the ability to efficiently build complex groundwater models. Visually stunning projects are at your fingertips with the new 5.0 New Engines SEAWAT Added Support for SEAWAT v.4: Visual MODFLOW Flex now supports SEAWAT, a fully coupled flow, multi-species solute and heat transport model developed by the USGS, based on a combination of MODFLOW-2000 and MT3D-MS. [Source Data courtesy U.S. Geological Survey] The following SEAWAT flow packages are supported in Visual MODFLOW Flex: BAS6 - Basic Package DIS - Discretization Package BCF6 - Block-Centered Flow Package LPF - Layer Property Flow Package

2 OC - Output Control Package RCH - Recharge Package EVT - Evapotranspiration Package WEL - Well Package DRN - Drain Package RIV - River Package GHB - General-Head Boundary Package FHB - Flow and Head Boundary Package CHD - Time-Variant Constant Head Package LAK - Lake Package (LAK3) HFB6 - Horizontal Flow Barrier package (HFB6) OBS Observation HOB - Hydraulic-Head Observation GMG - Geometric Multi-Grid Solver PCG - Pre-conditioned Conjugate Gradient Solver (PCG2) SIP - Strongly Implicit Procedure Package WHS - BiCGSTAB-P Matrix Solver LMG Link Multi-Grid package for using the SAMG (Systems Algebraic Multi-Grid) Solver The following SEAWAT transport packages are supported in Visual MODFLOW Flex: VDF - Variable Density Package VSC - Viscosity Package BTN - Basic Transport ADV Advection DSP Dispersion SSM - Source/Sink Mixing RCT Reaction Package GCG - Generalized Conjugate Gradient Solver NOTE: Advanced Translate/Run Settings enable partial support for simulating additional processes/packages (e.g. subsidence, drain return) developed outside of Flex. RT3D - Added Support for RT3D v2.5: Visual MODFLOW Flex now supports RT3D, an advanced reactive transport engine based on the popular MT3DMS transport engine. The following reaction modules are supported in Visual MODFLOW Flex: Instantaneous aerobic degradation of BTEX. Six Species, First-Order, Rate-Limited, BTEX Degradation using Sequential Electron Acceptors Rate-Limited Sorption Double Monod Model Sequential First-Order Decay (up to 4 species, e.g., PCE/TCE/DCE/VC) Aerobic/Anaerobic PCE/TCE Dechlorination

3 Visualization and Settings Dynamic additions to visualization and settings. Cell Inspector View and inspect structured and unstructured models at the cell-level using the new cell inspector, available in the workflow viewers. The cell inspector displays cell values for user-specified input and output data fields. Status Bar Cell dimensions have been added to the status bar. Time-Picker A time-picker is now available for unstructured grid workflow viewers. Layer-Picker A layer-picker is now available for unstructured grid workflow viewers. Workflows Additional Translation/Run Settings: Added advanced settings for all supported engines (excluding MODFLOW-USG) so that you can specify whether individual packages are translated and/or run with the model, which provides the flexibility to use your own package input files.

4 Packages, Properties, and Boundary Conditions New Property and Boundary Conditions tools. Field Calculator: Populate boundary condition fields using a calculator that includes an expression builder dialog to facilitate the inclusion of variables based on your model s properties (e.g. grid dimensions, elevations). Dispersion Parameters: Values can be edited in the Dispersion Parameter Dialog using copy, paste, and fill commands.

5 Other Enhancements Easy Classic Importing: Import your Classic project into Visual MODFLOW Flex directly from the file menu. Import Classic Concentrations: Boundary condition concentrations are now imported from Classic Projects. Animate Relative times in 3D views: in 3D View animations, the time stamp label for heads can be specified in relative or absolute time. Descriptive Title Bars for Settings Windows: settings windows now display descriptive window titles including the data layer and viewer the settings apply to. Rename Objects: Objects in the Data Explorer and most objects in the Model Explorer can be renamed. Feedback Button: Added anonymous feedback buttons so that you can easily report what features you like or don t like. SAMG Solver: Added a single-processor version of the SAMG solver for Visual MODFLOW PRO users. Defects Addressed Defining BCs along irregular polylines that are close to the active model limits produced unexpected results Reorder Tool was missing in some views The Show/Hide Gridlines button and associated toolbar disappeared intermittently from the viewer Well Data import failed without warning the user that the pumping schedule had inconsistencies, including pumping start date before model start date or pumping start date after pumping end date User could not assign polygon attribute data to conceptual recharge/evapotranspiration elements Problem(s) with Time Series Viewer Multiple PEST Workflows could be created for the same model run which corrupted the PEST workflow. Multiple issues in the advanced run/translation settings PCG Solver translation settings of the PCG2, PCG4, and PCG5 solver packages for MODFLOW-SURFACT models.

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