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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />4.6.3.8. Drought Risk lndex Score <br />The FEMA drought Risk lndex score and rating represent a community's relative risk for droughts when <br />compared to the rest of the United States. Table 4-48 illustrates the drought Risk lndex rating and score <br />for Kittitas County. <br />Table 4-48. Drought Risk lndex (FEMA National Risk Index) <br />Table 4-49 represents the drought 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 4-49. Drought Total Risk Score <br />Kittitas County Relatively Moderate 43.9 <br />Risk lndex scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Socla/ <br />Vulnerability and Community Resilience (Expected Annual Loss x Social Vulnerability / Community Resilience = Risk lndex). <br />Jurisdiction Rating Score <br />Hazard <br />Event Probability <br />Factor Vulnerability lmpact <br />2 I 6 16 31 33Drought <br />Consequence: Sum of all weighted factors. <br />Extent: Sum of the weighted Extent factors. <br />Vulnerability: Sum of the weighted Vulnerabilitv factors. <br />lmpactClassificationVulnerablll'ty <br />lmpact: Sum of the weighted lmpact factors. <br />Total Risk Score = Prcbability x Consequence. Normalized to 100 <br />Low (L)1 0-6 0-6 o-12 0 -24 0 -24 <br />Medium (M)2 7 -12 7-12 13 - 26 25-50 25-52 <br />27 -39 51 -75 53 and above313-18 13-18 <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 Conseouence. <br />Total Risk <br />r"ji, l .il!:li <br />-: \ f.lrl.')'1 a l <br />; lisli,r (l i) <br />Total Risk Score Legend <br />(r i.;I <br />TotalRisk <br />Score <br />Chapter 4: Hazard ldentification and Risk Assessment 106