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<br /> <br />2021 Multijurisdictional Local Hazard Mitigation Plan <br /> <br />Ranch, San Andreas, Searsville, and Spencer Lake. The individual dam depth grids were combined— <br />using the maximum depth where the dam inundation areas overlapped—and the combined depth grid was <br />integrated into the Hazus model. <br /> Tsunami—Tsunami hazard area data provided by the California Geological Survey and the County’s <br />5-foot digital elevation model data were used to develop inundation depth grids that were integrated into <br />the Hazus model. <br /> Earthquake—Earthquake ShakeMaps and probabilistic data prepared by the U.S. Geological Survey <br />(USGS) were used for the analysis of this hazard. A National Earthquake Hazard Reduction Program <br />(NEHRP) soils map from the California Department of Conservation, Association of Bay Area <br />Governments’ (ABAG) liquefaction susceptibility data, and susceptibility to deep-seated landslides data <br />from the California Geological Survey were also integrated into the Hazus model. <br /> <br />7.3.3 Other Local Hazard Data <br />Locally relevant information on hazards was gathered from a variety of sources. Frequency and severity indicators <br />include past events and the expert opinions of geologists, emergency management specialists, and others. Data <br />sources for specific hazards were as follows: <br /> Sea-Level Rise—Sea-level rise data were provided by the Our Coast, Our Future (OCOF) tool developed <br />by the USGS and Point Blue, and the Adapting to Rising Tides (ART) program prepared by the San <br />Francisco Bay Conservation and Development Commission. The exposure analysis used the OCOF <br />scenario of 200 cm (78 inches) of rise with a 100-year storm for the Pacific Ocean coastline and the ART <br />scenario of 108 inches of rise for the San Francisco Bay shoreline. <br /> Drought—No GIS format drought hazard area datasets were identified for San Mateo County. <br /> Landslide/Mass Movements—The California Geological Survey provided data on susceptibility to <br />deep-seated landslides. Areas categorized as very high and high susceptibility (Categories X, XI, VIII, <br />and VII) were used in the exposure analysis. <br /> Severe Weather—No GIS format severe storm area datasets were identified for San Mateo County. <br /> Wildfire—The California Department of Forestry and Fire Protection (CAL FIRE) provided data on fire <br />hazard severity zones in local and state responsibility areas. Very high and high fire hazard severity zones <br />were used in the exposure analysis. <br /> <br />7.3.4 Data Source Summary <br />Data sources on critical facilities used for the risk assessment for this plan are listed in Table 7-1; sources for all <br />other data used in the assessment are in Table 7-2 <br /> <br />7.4 LIMITATIONS <br />Loss estimates, exposure assessments and hazard-specific vulnerability evaluations rely on the best available data <br />and methodologies. Uncertainties are inherent in any loss estimation methodology and arise in part from <br />incomplete scientific knowledge concerning natural hazards and their effects on the built environment. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />7-6