Template:GMS MODPATH Porosities Workflow

Expand1. Assign porosity in the conceptual model.
Using the Select Polygon tool, right-click on polygons and select the Attribute Table command. Assign porosity in the Attribute Table dialog. (Requires Porosity be selected in the Coverage Setup dialog.) Right-click on the coverage and select the Map to | MODFLOW/MODPATH menu command.

Expand2. Assign porosity using MODPATH.
Select the MODPATH | Porosity menu command. Assign porosity in the Aquifer Layer Porosity array editor.

Expand3. Assign through grid properties.
Using the Select Cell tool (for either a 3D grid or UGrid), right-click on cells and select the Properties command. Enter porosity in the MODFLOW tab of the 3D Grid Cell Properties dialog or UGrid Cell Properties dialog.