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Redwood City Stormwater Roadmap <br />Appendix A: Data Review <br />September 2025 A-3 Schaaf & Wheeler <br />A.2 Stormwater System <br />A.2.1 ArcGIS <br />The City provided ArcGIS stormwater network system with a vertical datum of NAVD88 and a <br />horizontal datum of NAD 1983 State Plane California III FIPS 0403 (US Feet). A brief analysis of <br />available ArcGIS data for City-owned drainage infrastructure is summarized below. <br />Table A-1: City Drainage System ArcGIS Data <br />City Owned - ArcGIS Pipe Data <br />Total Number of Pipes 7795 <br />Percent of Pipes with Diameter 91% <br />Percent of Pipes with Upstream Invert 50% <br />Percent of Pipes with Downstream <br />Invert 51% <br />Percent of Pipes with Material Listed 97% <br /> <br />Pipe Material Class <br />Percent of <br />Total <br />RCP 69.8% <br />PVC 13.0% <br />ACP 3.3% <br />CMP 1.6% <br />CONC 0.5% <br />CIP 0.1% <br />DIP 0.1% <br />PE 0.0% <br />HDPE 4.1% <br />CP 0.2% <br />ADS 0.2% <br />Other or Unknown 7.2% <br /> <br />City Owned - ArcGIS Inlet Data <br />Total Number of Inlets 5120 <br />Percent of Inlets with Rim Elevations 33% <br />Percent of Inlets with Trash Capture 8% <br /> <br />City Owned - ArcGIS Manhole Data <br />Total Number of Manholes 1645 <br />Percent of Manholes with Rim <br />Elevations 48% <br /> <br /> <br />11.A. - Page 42 of 53 <br />473