I'd like to do a weighted flow accumulation to measure the flow accumulation from impervious surfaces. I've also done some terrain preprocessing with ArcHydro tools (Level DEM and Fill Sinks). Is it important to run additional ArcHydro terrain preprocessing tools (stream definition, stream segmentation, drainage line processing, create drainage line structures, create sink structures, DEM reconditioning etc.) if I plan to run weighted flow accumulation from the spatial analyst toolbox?
Thanks!
