I'm trying to create a flooding depth raster by using the "Stream WSE from point WSE Measurements" and "Flood from Stream WSE" as in (https://blogs.esri.com/esri/arcgis/2014/03/17/floodplain-delineation-using-only-arc-hydro-models). However, my output flood depth raster has line artifacts/abrupt changes in flooding depth that to not make sense given the underlying DEM is smooth in these locations. See the attached picture for an example, I'm using Lidar data for my DEM.
Any ideas on what would be causing these line artifacts? Thanks!