AbstractGIS-Based Stormwater Inventory for NPDES in Thurston County, WashingtonTrack: Water Resources Author Tetra Tech's GIS Service Center is working on a multi-year project to inventory storm water structures and assets in the NPDES Phase 2 planning area of Thurston County. The effort began with an analysis of internal business requirements and Washington Department of Ecology requirements for MS4 communities operating a storm utility under a Phase 2 NPDES permit. Tetra Tech designed an enterprise Geodatabase structure to support an RTK GPS-based inventory of storm features in the field that considered not only NPDES permit reporting requirements, but also necessary components for a forthcoming enterprise asset management system and hydraulic modeling efforts that require precise pipe invert elevation measurements. Important elements of this project include use of NPDES Phase 2 compliance experts, coordination of sub-meter GPS equipment and field personnel, establishment of a local control network, Geodatabase design for storm utilities, and the automation of processing GPS-located structures into a GIS Geometric Network. Owen Reynolds Thurston County Thurston Geodata Center 2404 Heritage Ct. SW Olympia, Washington 98502 United States Phone: 360-754-3355 E-mail: ofr@co.thurston.wa.us Christopher Hansen Tetra Tech PO Box 264 Stanwood, Washington 98292 United States Phone: 360-629-0242 E-mail: chris.hansen@tetratech.com |