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I have a flood innundation polygon and the DEM used to generate it. I've added the Z coordinates for the innundation shapefile from the DEM, but I need to get it to reach the next isoline which originated the DEM (20 m above), as if the flood would reach 20 m above the level represented in the shapefile and generate a new shapefile with the new spread of the flooding according to the terrain topography.

Does anyone know how to do that?

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