MODFLOW-USG GNC Package Workflow

To use the Ghost Node Correction (GNC) package in an existing MODFLOW-USG project, use the following processes:

1. Begin with an existing MODFLOW-USG project.
The existing model can be created using the conceptual model or grid based approach.

2. Activate the ghost node correction package.
Select MODFLOW \| Global Options. In the MODFLOW Global/Basic Package dialog, select the Packages button. In the MODFLOW Packages/Processes dialog, select the GNC – Ghost Node Correction option.

3. Add GNC data.
Select the MODFLOW \| Optional Packages \| GNC – Ghost Node Correction Package menu command. Compute ghost node correction data in the GNC Package dialog.

4. Run MODFLOW-USG.
Save the project. Run MODFLOW .

v • e GMS – Groundwater Modeling System
Modules:	2D Grid • 2D Mesh • 2D Scatter Point • 3D Grid • 3D Mesh • 3D Scatter Point • Boreholes • GIS • Map • Solid • TINs • UGrids
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