Washington State Department of Transportation (WSDOT), Environmental Services Office (ESO)This is a view of the EnergyDissipator featureclass created with the following query: LifeCycleCurrentStatus= 'Active' AND (WSDOTownership in ('Yes', 'Unknown') OR WSDOTownership IS NULL) AND (SWLocationVerified IS NULL OR SWLocationVerified = 'No') This feature class contains WSDOT's stormwater energy dissipators. An energy dissipator is a method to reduce the total energy of flowing water; a mechanism that reduces velocity prior to or at discharge from an outfall in order to prevent erosion (see Hydraulics Manual, Section 3-4.7;see also FHWA Hydraulic Engineering Circular No. 14). The WSDOT Stormwater Features Inventory Database should not document energy dissipators unless they occur at or near the end of a stormwater system, immediately prior to discharge. The majority of the data collected so far are within the Phase I and Phase II 2009 NPDES Municipal Stormwater Permit Areas.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/321aaec0536946ffb95c12db91203899_1engState of Washington Geospatial Open Data PortalPublicWSDOT - Stormwater Energy Dissipator - Office [Washington (State)]Web servicesWashington (State)Last Modified: 2026-01-06