Spatially Varying Feature Object Elevations

When building a conceptual model, rivers, drains, and general head objects are often represented using arcs.  In this case, the heads and elevations can be defined at the endpoints of an arc and then allowed to vary linearly along the length of the arc.  In some cases, however, the scale of the model is such that the local sources/sinks cover a large area of the model and it is necessary to represent such objects as polygons.  With past versions of GMS, the heads and elevations associated with such objects were always spatially constant (a single value or time series of values per polygon).  In version 5.0, the heads and elevations can now vary spatially over the area of the polygon.  The user simply clicks on the little down arrow to the right of the head/elevation and selects the <TIN> option.  Clicking on the "..." button will then bring up a dialog where a TIN representing the variation in heads/elevations can be selected.  When the Map -> MODFLOW command is selected.  The heads/elevations for all cells associated with the polygon are automatically interpolated from the TIN.