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<br />Event at First Floor - The exceedance interval of the flood event assumed to be located at the <br />first floor of a structure. For example, the 10 year event at the first floor refers to a flood event, <br />identified by flood hazard factor, whose 10 year exceedance interval has an elevation equal to <br />the elevation of the first floor of the structure. Placing different events at the first floor simulates <br />structures at different locations in the flood plain. <br /> <br />Expected Annual Damage - The flood damage, expressed as a percentage of structure value, <br />which is computed by weighting the damage potential (depth-damage data) for a structure by <br />its probability of occurrence (depth-frequency data). This is illustrated in Figure A-4, Appendix <br />A. <br /> <br />Expected Annual Damage Reduced - The difference between the expected annual damage <br />without a flood plain management measure and the expected annual damage with a measure. <br />This is not intended to be the same as a flood control benefit which often includes other dollar <br />savings brought about by a measure. <br /> <br />Cost - Refers to the estimated cost of a particular flood plain management measure. Appendix B <br />describes the method used. Expressed in both real dollars and as a percentage of structure <br />value. <br /> <br />Economic Feasibility - A comparison of damage reduced by a flood plain management measure <br />with the estimated cost of implementing the measure, both expressed as a percentage of <br />. structure value. The measure is termed economically feasible if the damage reduced equals or <br />exceeds the cost. <br /> <br />vi <br />