Description

Version 9.0 | Build 9.0.412.44834 (March 2023)

Additions:

MODFLOW-6 Groundwater Flow and Transport:

Visual MODFLOW Flex now supports MODFLOW-6, the newest core version of the groundwater modeling code developed by the USGS. MODFLOW-6 is based on a redesigned framework that supports 3D groundwater flow, solute transport, and various processes with an all new and more legible input file structure for both structured and unstructured grids. The following MODFLOW-6 flow packages are supported in Visual MODFLOW Flex:

• Simulation Packages:
  • NAM – Simulation Name File
  • TDIS – Time Discretization
  • IMS – Iterative Model Solution
• Groundwater Flow Model (GWF): Simulate saturated groundwater flow using structured finite difference grids or unstructured control volume finite difference grids (Voronoi or Quadtree).
  • NAM – Groundwater Flow Model Name File
  • DIS – Discretization Package
  • DISV – Discretization by Vertices Package
  • IC – Initial Conditions (Heads)
  • OC – Output Control Package
  • NPF – Node Property Flow Package
  • STO – Storage Package
  • CHD* – Time Varying Constant Head Package
  • WEL* – Well Package
  • DRN* – Drain Package
  • RIV* – River Package
  • GHB* – General-Head Boundary Package
  • RCH – Recharge Package
  • EVT – Evapotranspiration Package
• Solute Transport Model (GWT): Simulate groundwater solute transport using structured finite difference grids or unstructured control volume finite difference grids (Voronoi or Quadtree), including a variety of sorption, reaction, and immobile domain models.
  • NAM – Groundwater Transport Model Name File
  • DIS – Discretization Package
  • DISV – Discretization by Vertices Package
  • IC – Initial Conditions (Concentrations)
  • OC – Output Control Package
  • ADV – Advection Package
  • DSP – Dispersion Package
  • MST – Mobile Storage Transfer Package
  • IST – Immobile Storage Transfer Package (up to three immobile domains)
  • SSM – Source Sink Mixing Package
  • CNC* – Time Varying Constant Concentration Package
  • SRC* – Mass Source Loading Package
• Multiple Instance Packages: MODFLOW-6 allows you to include multiple instances of certain packages (marked with * above) in a simulation and track budgets separately for each package.
• Support for ZoneBudget-6: Evaluate sub-regional flows for your groundwater flow models using MODFLOW-6

Engines and Packages

• Assign Grid (In)active cell zones using data objects: You can use point, polyline, and polygon data objects to set the active/inactive flag for grid cells in the Finite Difference grid workflows
• Import MNW1 Wells from Classic Projects: Well information using the MNW1 well model in Classic Projects can be imported into Visual MODFLOW Flex
• Minimum thickness for Unstructured Grids: You can specify a minimum cell thickness below which unstructured grid cells will be removed from the grid so that you have more control on grid design around pinchout areas.
• MODPATH with SEAWAT: You can run a MODPATH particle tracking simulation based on a SEAWAT flow (and transport) run.
• Compare: Compare results for heads, drawdowns, or concentrations between two model runs using the same unstructured grid.

Performance, Usability, and Other Enhancements

• The unstructured grid workflow now uses the more familiar and intuitive conceptual well controls that uses coordinates and well screen information instead of cell indices
• You can specify default Total and Effective Porosity values at the Define Modeling Objectives step
• You can add particles for a particle track simulation based on Well objects in the Model Explorer as well as in the Data Explorer
• Improved speed and performance saving and loading projects
• You can specify a custom default project save location to save time when creating new projects
• New Keyboard Shortcuts:
  • Press CTRL+T at the Translate Step to translate a model
  • Press CTRL+R at the Run Step to run a model

Defects Addressed:

• Unhandled exception when replacing layer elevations with a surface containing holes (NoData) values
• Contour lines not shown for intervals with high precision/very small increments in some cases
• Intermittent “Failed to apply settings” error when visualizing recharge or evapotranspiration rates in some views
• Some view style settings do not honor the “Show in Cutaway” option
• In some cases, boundary condition schedules are not translated correctly in the SSM package
• Various windows issues with high resolution monitors:
  • Expression Builder window
  • Create Surface/Interpolation Settings window
  • Editing Conceptual Boundary Conditions
  • Define Property Zones step in the Conceptual Workflow
• In some cases, pathlines would not be exported as a shapefile
• Error editing numerical boundary condition in some cases
• Unhandled “index was out of range” error while copying property zones to another model property
• Error using the fill buttons on the Active checkbox field in the Edit Boundary Condition window
• Can’t save lake gauge data when there are no streams in the SFR workflow
• Errors realizing lakes using SFR workflow without streams
• In some cases, importing concentrations via a UCN file resets inactive cell flag to active in the associated grid where the water table is below grid layer 1
• Error creating boundary condition using a surface as a data source in some cases
• Error importing well schedule using absolute date with certain formats
• Editing the recharge database did not always edit the recharge boundary condition
• Transient Model with Steady-State stress period does not translate correctly
• Unable to run MODPATH due to null reference error
• Calibration Dashboard did not correctly report units in the summary statistics based on the selection
• Issue with defining boundary conditions for certain shapefiles
• Issue running PEST in some situations when parameter zones do not extend through all model layers
• Failed to move to target step error of Surface Water Workflow in some conceptual models
• Errors creating variograms in the PEST workflow in some cases
• Particle tracking pathlines do not display correct units/values due to unit conversion errors for some combinations of project units
• Unable to translate MNW2 package under some circumstances
• When draping basemap images onto a surface using the operations, a only limited number of points were sampled

Groundwater Flow & Contaminant Transport Modeling Software

Visual MODFLOW Flex brings together industry-standard codes for groundwater flow and contaminant transport, essential analysis and calibration tools, and stunning 3D visualization capabilities in a single environment.

Build models faster and more efficiently

• Model inputs and grid design can be updated at any point in the modeling process as modeling objectives change, more data are collected and a better understanding of the sub-surface is achieved.
• Modeling steps are conveniently presented in an intuitive, workflow-driven graphical user interface: see current and completed steps, and steps you need to finish.
• GIS-based 3D conceptual modeling and numerical modeling all within a single integrated software environment. This reduces costly 3rd party pre-processing tools, and eliminates transfer errors.

Build larger, more complex credible models

• Equipped to handle vast quantities of detailed, high resolution data. Simulate large and complex regional-scale groundwater systems.
• Model inputs and outputs can be easily visualized alongside raw GIS field data in 3D, allowing credibility by demonstrating numerical model data generation (model layers, flow parameters, recharge data) from conceptual data (borehole logs, GIS data).
• Unique design permits easy side-by-side comparisons of multiple models allowing you to assess alternative modeling scenarios, grid indiscretions and hydro-geologic interpretations.

Powerful Data Visualization

Built and designed on the latest in 3D visualization technology, Visual MODFLOW Flex allows you to effectively present and communicate your data to colleagues and stakeholders with impressive visual renderings of your hydrogeologic model.

• Visualize all data, including conceptual objects, numerical grids, input data (property zones, boundary condition cells) and output data (calculated heads, pathlines, water table) in state-of-the-art 2D, 3D and multi-view (FlexViewer) displays.
• Create cut-away and cross-sectional views that allow you to see inside your model.
• Generate 3D animations and movies for reports or the web, and optimized OpenGL graphics for enhanced hardware rendering.
• Add isolines, contours, pathlines and color shading to viewers.
• Drape raster images (site maps, satellite imagery) over 3D surfaces to show relief