In the Groundwater frame (Figure 1) the user can select a range of groundwater interaction options. The user should review the EFDC code to ensure the option specification and EFDC function for the groundwater parameters. The current options are:
...
- Disable: Disable groundwater interaction;
...
- Soil Wetting/Drying: Allow soil wetting and drying;
...
- Groundwater Interaction: Allow groundwater interaction (using GWMAP and GWSER),
...
- Zoned Constant Seepage: Apply a constant groundwater flux out of the model by zones (using GWSEEP and GWMAP, and available for EFDC+ only).
The
...
Edit Seepage button gives access to the groundwater class data (Option 3). The number of series is input in the appropriate box and then the grid allows the user to specify the groundwater class data.
...
Apply Overlay button is used to match groundwater classes to the EFDC cells
...
. The user open the polygon file and then specify the groundwater class, and then click the Apply button to assign all the cells that are inside the polygon to that groundwater class.
Figure 1 Domain Tab: 
Figure 1. Boundary Conditions for Groundwater.