Drainage - Virtual Drainlines
Virtual 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.co.pierce.wa.us/GISmetadata/pdbpubw_swVirtualDrainLine.html) for additional information.  Any data download constitutes acceptance of the Terms of Use (https://matterhorn.co.pierce.wa.us/Disclaimer/PierceCountyGISDataTermsofUse.pdf).
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