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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br /> <br /> <br />Chapter 4: Hazard Identification and Risk Assessment 65 <br />to other communities at the same level. Since the score is associated to a community’s risk; the higher <br />EAL score results in a higher Risk Index score.49F <br />50 <br /> <br />Table 4-18 illustrates the EAL rating and score for Kittitas County. <br />Table 4-18. Expected Annual Loss for Kittitas County (FEMA National Risk Index) <br />Jurisdiction Rating Score <br />Kittitas County Very High 85.9 <br />Expected Annual Loss scores are calculated utilizing an equation that combines values for exposure, annualized frequency, and historic loss <br />ratios (Expected Annual Loss = Exposure x Annualized Frequency x Historic Loss Ratio). <br /> <br />An EAL score and rating is calculated independently for each consequence type (i.e., buildings, <br />population, and agriculture) for each county and Census Tract. The population EAL is measured in <br />fatalities and injuries while the building and agriculture values are measured in dollars. However, for <br />consistency in the unit of measurement, the population EAL was monetized into population equivalence <br />using a value of statistical life (VSL) approach where each fatality or 10 injuries is treated as $11.6 Million <br />of economic loss. <br />4.4.2. Social Vulnerability <br />Social vulnerability, the consequence enhancing risk component of the NRI, measures the susceptibility <br />of social groups to the adverse impacts of natural hazards, including disproportionate death, injury, loss, <br />or disruption of livelihood. The Social Vulnerability score and rating represent the relative level of a <br />community’s social vulnerability compared to all other communities at the same level. A higher Social <br />Vulnerability score results in a higher Risk Index score.50F <br />51 <br /> <br />Table 4-19 illustrates the Social Vulnerability rating and score for Kittitas County. <br />Table 4-19. Social Vulnerability for Kittitas County (FEMA National Risk Index) <br />Jurisdiction Rating Score <br />Kittitas County Relatively Low 30.1 <br />Social Vulnerability is measured using the Social Vulnerability Index (SoVI) published by the University of South Carolina’s Hazards and <br />Vulnerability Research Institute (HVRI). <br />4.4.3. Community Resilience <br />Community resilience, the consequence reduction risk component, measures the ability of a community <br />to prepare for anticipated natural hazards, adapt to changing conditions, and withstand and recover <br />rapidly from disruptions. The Community Resilience score and rating represent the relative level of a <br />community’s resilience compared to all other communities at the same level. Since the score is inversely <br />proportional to a community’s risk; the higher Community Resilience score results in a lower Risk Index <br />score.51F <br />52 <br /> <br />50 Federal Emergency Management Agency. (2023). Expected Annual Loss. Retrieved from <br />https://hazards.fema.gov/nri/expected-annual-loss. <br />51 Federal Emergency Management Agency. (2023). Social Vulnerability. Retrieved from <br />https://hazards.fema.gov/nri/social-vulnerability. <br />52 Federal Emergency Management Agency. (2023). Community Resilience. Retrieved from <br />https://hazards.fema.gov/nri/community-resilience.