View Orientation In Model mode, Graphic Groundwater can display three different grid orientations; a horizontal section (plan orientation, the default), a vertical section parallel to rows (row orientation), and a vertical section parallel to columns (column orientation). You change orientation with the commands displayed with the Orientation command, in the View menu. In a three dimensional grid, you can view only one slice at a time. A slice is a single layer in plan orientation, a single row in row orientation, or a single column in column orientation. You can navigate from one slice to another with the Slice drop down list box located in the toolbar above the Model window. The label on the list box changes to reflect the current orientation (for example, Layer is the label adjacent to the drop down list in plan orientation). Graphic Groundwater includes error checking to ensure that you do not create illogical cross-sections in all new models. An illogical vertical section is one where the model cells overlap. For example, an illogical vertical section would occur if the top elevation of a cell in layer 2 is greater than the bottom elevation of a cell in layer 1. Error checking depends on the option selected in the Basic Information Preferences window in the Spatial Type frame. For example, if you select the Quasi Three Dimensional option button, layers surrounding the currently selected layer have precedence. This means Graphic Groundwater will not allow you to set the top elevation of layer so that it is above the bottom elevation of the overlying layer. If you enter an illogical number, Graphic Groundwater will adjust it so that the vertical geometry of your model makes sense. If you select the Fully Three Dimensional option button, the currently selected layer has precedence. This means that the surrounding layers are adjusted to maintain a logical vertical geometry. This operates up to a point. If, for example, you try to set the top elevation of a layer so that it is above the top elevation of the overlying layer, Graphic Groundwater will not make the change. In fact, it will do nothing. Try several cases to get a feel for how Graphic Groundwater maintains logical vertical sections. Models created with older versions of Graphic Groundwater that already have illogical vertical geometry can be opened with this version of Graphic Groundwater, but they may not display correctly in a vertical section orientation. As you create layers, Graphic Groundwater will suggest top and bottom elevations. You can change these default values, but the same error checking described above still operates. If the Slice drop down list in the toolbar at the top of the Model window has the focus, you can quickly move through a grid by pressing the up or down arrow keys that come with most keyboards. Changing slices this way can create a dramatic effect, almost as if you are walking through the model. If a cell is selected, and you change from plan to a row or column orientation, Graphic Groundwater will take you to the section that includes that cell. For example, if you have selected the cell in column 5 and row 3, then shift to row orientation, Graphic Groundwater will display row 3. If you shift to column orientation, the program will display column 5. Zones, cell stresses and particle batches are confined to a single slice. In other words, a series of cells belonging to the same stress must all be in the same slice. If you select a cell stress that is in a slice that cannot be displayed in the current orientation, Graphic Groundwater will take you to the correct orientation. Suppose you create a stress in row orientation that includes two cells, one in layer 1 and the other in layer 2 of your model. If you change the view to plan orientation, then select that stress in the drop down list of the Cell Stress Overlay window, Graphic Groundwater will take you back to row orientation because it cannot display cells in two different layers in plan orientation. A batch of particles or cell stress that includes just a single cell can be displayed in any orientation.