Waterloo Hydrogeologic Visual MODFLOW Flex 9.0 (412.45223)

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:
- MFSIM.NAM – Simulation Name File
- TDIS – Time Discretization
- MS – 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).
- GWF.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.
- GWT.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