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<br />Expected annual flood damage and damage reduced were computed and the data plotted for <br />a wide range of hydrologic, hydraulic, and economic conditions. Costs were compared with <br />damage reduced for a number of measures. These analyses show the economic feasibility of <br />these measures and the. sensitivity of the damage estimates to important variables. This <br />quantification of expected annual damage makes explicit the methodology involved and should <br />prove useful to persons unfamiliar with it. The sensitivity findings show some variables more <br />important than others and by how much. They also provide an estimate of adjustments which. <br />should be made for atypical situations. These findings have led to a much better understanding <br />of flood damage estimation than was available before. <br /> <br />lastly, the study has shown the way for developing an analytic and data management <br />technology for nonstructural formulation and evaluation. Findings concerning physical and <br />economic feasibility have identified important parameters and variables which are needed to <br />properly formulate and evaluate nonstructural measures. For a particular flood plain, data <br />would be collected for each parameter and variable. Currently available analytic capability for <br />damage computations and data management technology would be used to process these data <br />and make analyses. Various spatial display devices are also available to facilitate presentation of. <br />the results. This coupling of a deeper understanding of what is important to explicitly evaluate <br />each measure, with the technology to make this evaluation and process the data, should prove <br />to be a significant step toward more effective consideration of nonstructural measures in <br />planning. <br /> <br />The measures were investigated and disscussed as individual flood plain management <br />actions. In application, however, it is likely that they will be used in a variety of combinations. <br />Some will be used for existing development, others for future; some for residential structures, <br />others for commercial/industrial; some at locations of frequent flooding, others where it is less <br />frequent. For each structure or parcel of land the most appropriate action should be selected <br />and the management plan should be the sum of the individual parts. <br /> <br />Damage data lor different hydrologic conditions and types of structures are tabulated and <br />plotted in Appendix A. These data were used in this investigation and may be useful to others in <br />estimating expected annual damage. The user should be cautioned however. First, the damage <br />values were computed using generalized frequency and depth-damage data. These values <br />should not be used in analyses where more detailed site specific data are required. Second, the <br />data presented are estimates of damage and damage reduced which may not be the same as a <br />benefit. An examination of the other savings which might be included as a benefit was beyond <br />the scope of this study. <br /> <br />iv <br />