Grids are used in MODFLOW, PHAST, and Footprint models. A grid can be generated in four ways.
1.When a new model is first created, a uniform grid can be specified.
2.The commands Grid|Specify Grid Angle… and Grid|Specify Grid Lines… can be used to specify the grid numerically.
3.A grid can be drawn and rotated with the mouse.
4.The user can use objects to define where the grid should be and then use the Grid|Generate Grid... command to create it.
These four options are explained in greater detail in the following sections.
With MODFLOW 6 models, structured grids can be converted to Discretization by Vertices.