With MODFLOW models, the user must choose which packages to use in the model in the Model|MODFLOW Packages and Programs dialog box. The packages define the types of boundary conditions that can appear in the model, the method used to solve the model equations, and various other aspects of the model.
Stress periods for the model are set up in the Model|MODFLOW Time dialog box. The stress periods define time periods in the model during which the stresses on the model are kept constant (with a few exceptions).
Layers in the model can be confined or convertible between confined and unconfined. This and other properties can be set in the Model|Layer Groups dialog box.
Objects and Formulas are used to define the spatial data such as the distribution of hydraulic conductivity and the location of boundary conditions. The objects can be drawn on the top, front, or side views of the model or imported from external sources such as Shapefiles. It is also possible to import a background image to help when designing the model.
To execute the model, select File|Export|MODFLOW Input Files.
To view the model results, select File|Import|Model Results...