The polygons are intended for use by the City of Seattle as planning-level tool for a preliminary understanding of the drainage patterns in particular areas of the City. The layer is not complete and does not reflect any City determination about how specific locations should be characterized. The delineation was based on drainage, land use, type of waterbody, and neighborhoods. Displays data from DWW.receiving_wtrbdy_plgn_pv with the following data query: RWB_NAME <> 'Urban Combined System'. Labels are based on the attribute NAME. This layer does not display when zoomed out beyond 1:400,000. Refreshed weekly.