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<br /> <br />discussed in Appendix A. The damage reduced shown is the maximum possible for these <br />conditions since removal eliminates all damage to structure and contents. <br /> <br />In Federal planning a distinction is made between damage reduced by relocation, and <br />benefits. Benefits include cost savings to non-users, for example, Federal Flood Insurance <br />subsidies, emergency evacuation, other public savings. They do not generally indude damage <br />reduced because it is reflected in the reduced value of flood plain property. <br /> <br />Annual costs as a percentage of structure value developed in Tables 7-1 and 7-2 are also <br />shown on Figures 7-2 through 7-5. A percentage of 4.6 corresponds to removing both structure <br />and contents to a flood free site and 6.7 percent corresponds to removing only contents and <br />demolishing the existing structure. A comparison of cost and damage reduced shows that <br />removing both structure and contents is economically feasible for, <br /> <br />. A one or two story, no basement, structure below approximately the 5 year flood plain <br />and flood hazard factor of 2.0 feet, and below about the 10 year flood plain and a flood <br />hazard factor of 12.0 feet. <br /> <br />. A one story, with basement, structure below the 15 year flood plain with flood hazard <br />factor of 6.0 feet or more; below the 30 year event with a flood hazard factor equal to 4.0 <br />feet; and below the 100 year flood plain with a flood hazard factor of 2.0 feet. The flood <br />hazard factor is particularly important when assessing damage to this type structure. (For <br />an explanation of why expected annual damage decreases with increasing flood hazard <br />see Appendix A.) <br />. A two story, with basement, structure below the 10 year flood plain for a flood hazard <br />factor of 6.0 feet or greater, and below the 30 year for a flood hazard factor of 2.0 feet. <br /> <br />To remove contents only and demolish the existing structure (the more costly option) these <br />data show that structures without basements must be located approximately below the 5 year <br />flood plain, and structures with basements must be located approximately below the 10 year <br />flood plain. There is some variability depending upon the flood hazard factor, but less than <br />when structure and contents are removed. <br /> <br />Advantages and Disadvantages <br />Tables 7-3 and 7-4 summarize advantages and disadvantages of the two removal options <br />being discussed in this Chapter. <br /> <br />TABLE 7-3 <br /> <br />ADVANTAGES AND DISADVANTAGES <br />OF REMOVING EXISTING CONTENTS FROM A FLOOD HAZARD AREA <br />AND DEMOLISHING OR REUSING THE STRUCTURE <br /> <br />Advantages <br /> <br />Flood damage to the existing contents is <br />eliminated. If the structure is demolished <br />structural damage is eliminated. <br /> <br />Disadvantages <br /> <br />Damage to the structure and site remain if <br />the structure is reused. <br /> <br />Costs to remove contents and demolish the <br />structure are high relative to other measures. <br /> <br />52 <br />