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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />4.6.6.7. FEMA NRI Expected Annual Loss Estimates <br />A landslide NRI EAL score, and rating represent a community's relative level of expected building and <br />population loss each year due to landslides when compared to the rest of the United States. The EAL <br />score is positively associated to a community's risk; therefore, a higher EAL score results in a higher Risk <br />lndex score. Table 4-89 outlines the landslide EAL for Kittitas County. <br />Table 4-89. Landslide Expected Annual Loss (FEMA National Risk lndex) <br />4.6.6.8. Landslide Rtsk lndex Scores <br />The FEMA landslide Risk lndex score and rating represent a community's relative risk for landslide when <br />compared to the rest of the United States. Table 4-90 illustrates the landslide Risk lndex rating and score <br />for Kittitas County. <br />Table 4-90. Landslide Risk lndex (FEMA National Risk Index) <br />Table 4-91 represents the landslide Total Risk Score for the Kittitas County, based on the Risk <br />Assessment Methodology, as defined in Section 4.3 of this Plan. <br />Table 4-91. Landslide Total Risk Score <br />$19,713 nla $81,441 78.2 Relatively <br />HighKittitas County $61,729 <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 />Total <br />Expected <br />Annual <br />Loss <br />Expected <br />Annual <br />Loss <br />Score <br />RatingJurisdictionPopulation <br />Equivalence <br />Building <br />Value <br />Agriculture <br />Value <br />Relatively High 76.9Kittitas County <br />Risk lndex scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Social <br />Vulnerability and Community Resilience (Expected Annual Loss x Social Vulnerability / Community Resilience = Risk Index). <br />Jurisdiction Rating Score <br />Vulnerabillty lmpact <br />Hazard <br />Event Probability <br />Factor <br />37 39Landslide2121213 <br />Conseguence: Sum of all weighted factors. <br />Extent: Sum ofthe weighted Extentfactors. <br />Vulnetability: Sum of the weighted Vulnerabilitv factors. <br />lmpactClassificationVulnerability <br />lmpact: Sum of the weighted lmpact factors. <br />Total Risk Score = Probability x Consequence <br />* Normalized to 100 <br />0-12 0 -24 0-24Low (L)1 0-6 0-6 <br />25-50 25-52Medium (M)2 7-12 7-12 13 -26 <br />53 and above?13-18 13-18 27 -39 51 -75 <br />The legend-specifically the assignment of low, medium, and high-provides an additional means to qualitatively assess the probability factor, sum of <br />weighted factors, and the total risk scores for each hazard. The Consequence Score represenls the sum of the Extent, Vulnerabilily, and lmpact Factors <br />The Total Risk Score is a measure of Probabilitv and Consequence. <br />Total Risk <br />I ,-'i':,i r:':i'1" <br />:'.r (.{ 'i '{ ' <br />ll listiir (iil,) <br />Total Risk Score Legend <br />) il i. ri:,1 <br />TotalRisk <br />Score <br />Chapter 4: Hazard ldentification and Risk Assessment 148