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<br /> <br />2021 Multijurisdictional Local Hazard Mitigation Plan <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Figure 15-7. Critical Facility Damage in the Tsunami Inundation Zone <br /> <br /> <br />Vulnerable Infrastructure <br />In addition to the vulnerable critical facilities identified by the Hazus analysis, the following infrastructure is also <br />generally vulnerable to damage: <br /> Water Proximate Infrastructure—Breakwaters and piers collapse, sometimes because of scouring <br />actions that sweep away their foundation material and sometimes because of the sheer impact of the <br />tsunami waves. <br /> Flood Control Systems—Floodwaters can back up drainage systems, causing localized flooding. <br />Culverts can be blocked by debris from tsunami events, also causing localized urban flooding. <br /> Utility Systems—Floodwaters can get into drinking water supplies, causing contamination. Sewer <br />systems can be backed up, causing waste to spill into homes, neighborhoods, rivers, and streams. <br />Tsunami waves can knock down power lines and radio/cellular communication towers. Power generation <br />facilities can be severely impacted by wave action and by inundation from floodwater. <br /> <br />15.4.4 Environment <br />Environmental impacts on local waterways and wildlife would be most significant in areas closest to the point of <br />impact. Areas near gas stations, industrial areas and facilities storing hazardous materials are vulnerable. The <br />vulnerability of aquatic habit and associated ecosystems in low-lying areas close to the coastline is high. Tsunami <br />waves can carry destructive debris and pollutants that can have devastating impacts on all facets of the <br />environment. Millions of dollars spent on habitat restoration and conservation in the planning area could be wiped <br />out by one significant tsunami. A tsunami event has the potential to alter the shoreline, depending on the force of <br />the run-up. <br /> <br /> <br />15-12 <br />100.0 <br />100 46 50 <br />82.4 45 39 <br />80 40 <br /> <br />35 <br />60 57.5 30 <br /> <br />25 19 <br />40 35.6 38.6 38.3 <br />31.7 20 <br />26.6 15 <br />20 18.2 19.5 <br />5 <br />7 14.9 10 <br />4.6 2 3 7.9 5 <br />N/A <br />0 0 <br />Safety and Food, Water and <br />Security Sheltering <br />Health and <br />Medical <br />Energy Communications Transportation Hazardous <br />Material <br />% Damage to Structure % Damage to Contents Number of Facilities Affected Average Damage as % of Total Value Number of Facilities Affected