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In some instances, especially draping surfaces, there may be an excessive spatial framework beyond the extent of flooding. This un-needed spatial framework will incur un-necessary space in the file and add time to processing within waterRIDE™. The clipping menu enables this un-needed structure to be removed from a file by clipping to the wet extents or by clipping to a pre-defined polygon. A clipping polygon can be created in a GIS (e.g. MapInfo) or by using the GIS Tools in waterRIDE™. A new file will be created when clipping.

Also, areas of a file can be "nullified" (i.e. set to the delete value of -9999.99) within (or outside of) a specified polygon (or multiple polygons), or using the flood extents of another grid. This may be useful to remove unwanted 'noise' as a result of water surface mapping, or if you do not wish an end-user to access model results in a particular area. When "nullifying" an area, the user can specify whether to include the terrain surface in the nullify process. Nullify is applied directly to the selected water surface file and can be carried out as a process or dynamically by drawing polygons on the active view.