City of Seattle ArcGIS OnlinePlanning level Infiltration Potential - NOT FOR ENGINEERING DESIGN. A starting point to determine if a Seattle modified PIT test should be considered for a site under development that is considering infiltration using green stormwater infrastructure or low impact development techniques. See PIT test information in the 2009 Stormwater Directors' Rule - Volume 3: Stormwater Flow Control and Water Quality Treatment Appendix E: City of Seattle Modified Procedure for Conducting a Pilot Infiltration Test. Uses data from UTIL.UW_INFILTRATION, symbolized based on PERMEABILITY field.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/e5b9cde0246a4428bb51668a289c12fb_0engSeattle GeoDataPublicInfiltration Potential [Washington (State)--Seattle]Web servicesWashington (State)--SeattleWashington (State)Last Modified: 2024-02-21