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  1. This is a judgment question. When editing cross sections, I am faced with situations where the placement of the DEM-generated channel seems incorrect because there is a deeper dip in elevation on either side, anywhere from 50 to 300 meters. Should I shift the channel banks in order to bound the shallower channel or keep them where they are and ignore the other channel? The purpose of the analysis is unltimately delineating flood zone. Also, should the editing of cross sections be done in WMS or HEC-RAS? Thanks.