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<br />) <br /> <br />) <br /> <br />include: residential, commercial, industrial, public use, utilities, and <br /> <br />transportation. <br /> <br />Procedure: This relationship is derived after the stage and flow <br /> <br />relationships have been combined with flow-frequency relationships to <br /> <br />produce the elevation-frequency relationship, and the stage-frequency <br /> <br />relationship is combined with the depth-damage relationship for each flood <br /> <br />reach, zone and damage category. Figure V-7 gives the aggregated damage- <br /> <br />frequency relationships for various damage categories. <br /> <br />STEP EIGHT: CALCUIATE EXPECTED ANNUAL DAMAGES <br />Definition: The expected annual damage is the expected value of <br />flood loss in any given year. <br />Use: Expected annual damages are the most tangible measure of the <br /> <br /> <br />severity of the existing flood problem. Generally, ~ny project that is <br /> <br /> <br />economically justified on the basis of existing conditions will be <br /> <br /> <br />justified in the future. <br /> <br /> <br />Procedure: Expected annual damages are calculated by computing the <br /> <br />area under the damage-frequency curve. This is done mathematically by <br /> <br />taking an integral of the function. It does not mean that this amount of <br /> <br />damage will occur in any particular year, but rather that over a long <br /> <br />period of time, the average amount of damage will tend to approach that <br /> <br />amount. <br /> <br />Assessment of existing conditions includes the consideration of any <br /> <br />structure that is already in place (See Step Five on inventory of the <br /> <br />floodplain for an explanation of this process). There is no projection <br />involved. <br /> <br />V-47 <br />