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<br /> <br />2021 Multijurisdictional Local Hazard Mitigation Plan <br /> <br />19.2 IMPACT <br />Hazard impacts were assessed in three categories: impacts on people, impacts on property and impacts on the <br />local economy. Numerical impact factors were assigned as follows: <br /> People—Values were assigned based on the percentage of the total population exposed to the hazard <br />event. The rating of this impact assumes, for simplicity and consistency, that all people exposed to a <br />hazard because they live in a hazard zone will be equally impacted when a hazard event occurs. Planners <br />can use an element of subjectivity when assigning values for impacts on people. Impact factors for people <br />were assigned as follows: <br /> High—50 percent or more of the population is exposed to a hazard (Impact Factor = 3) <br /> Medium—25 percent to 49 percent of the population is exposed to a hazard (Impact Factor = 2) <br /> Low—25 percent or less of the population is exposed to the hazard (Impact Factor = 1) <br /> No impact—None of the population is exposed to a hazard (Impact Factor = 0) <br /> Property—Values were assigned based on the percentage of the total property value exposed to the <br />hazard event: <br /> High—30 percent or more of the total assessed property value is exposed to a hazard <br />(Impact Factor = 3) <br /> Medium—15 percent to 29 percent of the total assessed property value is exposed to a hazard <br />(Impact Factor = 2) <br /> Low—14 percent or less of the total assessed property value is exposed to the hazard <br />(Impact Factor = 1) <br /> No impact—None of the total assessed property value is exposed to a hazard (Impact Factor = 0) <br /> Economy—Values were assigned based on the percentage of the total property value vulnerable to the <br />hazard event. Values represent estimates of the loss from a major event of each hazard in comparison to <br />the total assessed value of the property exposed to the hazard. For some hazards, such as wildfire, <br />landslide and severe weather, vulnerability was considered to be the same as exposure due to the lack of <br />loss estimation tools specific to those hazards. Loss estimates separate from the exposure estimates were <br />generated for the earthquake and flood hazards using Hazus. <br /> High—Estimated loss from the hazard is 20 percent or more of the total assessed property value <br />(Impact Factor = 3) <br /> Medium—Estimated loss from the hazard is 10 percent to 19 percent of the total assessed property <br />value (Impact Factor = 2) <br /> Low—Estimated loss from the hazard is 9 percent or less of the total assessed property value (Impact <br />Factor = 1) <br /> No impact—No loss is estimated from the hazard (Impact Factor = 0) <br /> <br />The impacts of each hazard category were assigned a weighting factor to reflect the significance of the impact. <br />These weighting factors are consistent with those typically used for measuring the benefits of hazard mitigation <br />actions: impact on people was given a weighting factor of 3; impact on property was given a weighting factor of <br />2; and impact on the operations was given a weighting factor of 1. Figure 19-2 and Figure 19-3 summarize the <br />unweighted and weighted impact factors, respectively, for each hazard. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />19-2