Pierce County, WashingtonVirtual Drainlines are used to maintain network connectivity when conveyance features are absent. For example, if a stormwater pond has both inlet and outlet conveyance pipes, a virtual drainline is used to connect the inlet and outlet pipes through the pond. Virtual drainlines do not represent "real-world" features, but are used to show the flow direction and path of stormwater and maintain network connectivity in a GIS. Please read metadata ( https://matterhorn.piercecountywa.gov/GISmetadata/pdbpubw_swVirtualDrainLine.html ) for additional information. Any data download constitutes acceptance of the Terms of Use ( https://matterhorn.piercecountywa.gov/Disclaimer/PierceCountyGISDataTermsofUse.pdf ).ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/a2492586091c4b9fb73dc6062b455af0_0engPierce County Open GeoSpatial Data PortalPublicDrainage Virtual Drainlines [Washington (State)--Pierce County]Web servicesWashington (State)--Pierce CountyWashington (State)Last Modified: 2025-12-17