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<br /> <br />2021 Multijurisdictional Local Hazard Mitigation Plan <br /> <br />Bridges <br />Geospatial analysis identified 11 bridges that would be exposed to the tsunami hazard. Bridges exposed to <br />tsunami events can be extremely vulnerable because of the forces transmitted by the wave run-up and by the <br />impact of debris carried by the wave action. <br /> <br />Water/Sewer/Utilities <br />Water and sewer systems can be affected by the flooding associated with tsunami events. Floodwaters can back <br />up drainage systems, causing localized flooding. Culverts can be blocked by debris from flood events, also <br />causing localized urban flooding. Floodwaters can enter drinking water supplies, causing contamination. Sewer <br />systems can be backed up, causing wastes to spill into homes, neighborhoods, rivers and streams. The forces of <br />tsunami waves can damage aboveground utilities by knocking down power lines and radio/cellular <br />communication towers. Power generation facilities can be severely impaired by both the impact of the wave <br />action and the inundation of floodwaters. <br /> <br />15.3.3 Environment <br />All waterways and beaches would be exposed to the effects of a tsunami; inundation of water and introduction of <br />foreign debris could be hazardous to the environment. All wildlife inhabiting the area also is exposed. <br /> <br />15.4 VULNERABILITY <br />15.4.1 Population <br />Vulnerable populations are all populations within the tsunami inundation areas that are incapable of escaping the <br />area before floodwaters arrive. An analysis was performed using Hazus and the SoVI ratings (see Section 7.2.2) <br />of the population living in the mapped tsunami inundation areas. Detailed results by jurisdiction are in Appendix <br />E. Table 15-3 summarizes results for the overall planning area. <br /> <br />Table 15-3. Distribution of Population Exposed to Tsunami Hazard by SoVI Rating <br /> <br />SoVI Rating <br />Population Living in Exposed Areas Having the SoVI Rating Shown <br />Number of People % of Total Exposed Population <br />Very High 452 4.16% <br />Relatively High 911 8.39% <br />Relatively Moderate 4,229 38.98% <br />Relatively Low 5,258 48.47% <br />Very Low 0 0 <br /> <br />Additional countywide results of the Hazus analysis are as follows: <br /> Number of displaced households = 7,362 <br /> Number of people requiring short-term shelter = 415 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />15-10