Hi, Using 9.0.2, I have built the framework for a model which incorporates LIDAR for ground surface elevations (GSE) and horizons from borings for the underlying layers. When I push all of this to the 3D grid, the topography of the GSE seems to manifest itself in the lower layers. The ground surface is anthropogenic and should not have any bearing on the surface of the lower layers. Is the behavior I am seeing supposed to be happening or did I miss a setting when I pushed everything to the 3D Grid (Map to Modflow and Horizons to Solids->Solids to Modflow)? Thanks, Dale Bridgford