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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>SLR Inundation Mapping</SPAN></P><P><SPAN>The topographic data used for this analysis were derived from topographic light detection and ranging (LiDAR) data from NOAA. The SLR inundation mapping was completed on a 1-meter (3.28-feet) digital elevation model (DEM) derived from the bare-earth LiDAR data. The DEM was created by the Port of San Francisco PEC team for the Embarcadero Seawall Program, a component of the Port of San Francisco Waterfront Resilience Program. This data file was developed specifically for the Port of San Francisco planning level program-wide assessment and should not be interpreted as site-specific assessment. For additional details on the DEM development, including modifications to update elevations for piers and wharf structures - see metadata for DEM named PoSF_DEM_final_20200127_ft.</SPAN></P><P><SPAN>The inundation mapping effort leveraged existing and readily available model output from a large-scale MIKE21 San Francisco Bay hydrodynamic modeling effort completed as part of FEMA’s San Francisco Bay Area Coastal Study (DHI 2013). The model takes into account water level variations associated with astronomical tides, storm surge, and El Nino effects. The FEMA model output was used to determine the daily and extreme tide levels throughout the study area for input to the SLR inundation mapping.</SPAN></P><P><SPAN>Inundation maps were developed using the NOAA Coastal Services Center methods (Marcy et al. 2011). The initial step in creating the inundation maps was to create the inundated water surface DEM. Daily and extreme high tide elevations derived from the FEMA MIKE 21 model output points were used to define the water surface elevations for the existing and future conditions 100-yr SWEL. The water surface elevations were then extended inland to project the water surface over the inundated topography. Depth of flooding raster files were created by subtracting the land-surface DEM from the water surface DEM. The resultant DEM provides both the inland extent and the depth of inundation in feet. The final step used in creating the depth and extent of flood maps relies on an assessment of hydraulic connectivity. The assessment of hydraulic connectivity removes areas from the inundation zone if they are protected by levees or other topographic features that are not overtopped. </SPAN></P></DIV></DIV></DIV>

Service Item Id: 23c24c4214ea44c1b0bbf2af5901ac48

Copyright Text: Pathways Climate Institute (2022)

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