MODFLOW-LGR Workflow

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To use MODFLOW-LGR (Local Grid Refinement) in an existing MODFLOW project, use the following processes:

1. Begin with an existing MODFLOW project.
The existing model should be created using the conceptual model approach.
2. Change the simulation to use MODFLOW-LGR.
  1. Select MODFLOW | Global Options.
  2. In the MODFLOW Global/Basic Package dialog, select the LGR radio button.
3. Run MODFLOW-LGR.
  1. Save Save Macro.svg the project.
  2. Run MODFLOW Run MODFLOW Macro.svg.
4. Create a child grid.
  1. Use the Select Cells Select 3D Cell Tool.svg tool to drag a box in the child grid area.
  2. Right-click in the selected area and select Create Child Grid….
  3. Enter child grid parameters in the Create Child Grid dialog.
5. Define MODFLOW-LGR options.
  1. Select MODFLOW | Global Options.
  2. In the MODFLOW Global/Basic Package dialog, select the LGR Options button.
  3. Set parameters in the LGR Options dialog.
6. Map to MODFLOW for the child grid.
  1. Select the conceptual model Conceptual Model Icon.svg.
  2. Select Feature Objects | Map → MODFLOW Map to MODFLOW Macro.svg.
  3. Select the appropriate options in the Map → Model dialog.
7. Save and re-run MODFLOW-LGR.
  1. Save Save Macro.svg the project.
  2. Run MODFLOW Run MODFLOW Macro.svg.