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<br />) <br /> <br />these events in that year. The summation of all probable damages, <br /> <br />over the range of events, defines expected damages for that year. <br /> <br />This summation of probable damages is the same as EAD computed from <br /> <br />the damage-frequency curve. However, to be considered an annual <br /> <br />damage estimate over the period of analysis, essentially the same <br /> <br />hydrologic and economic conditions must prevail over the period of <br /> <br />analysis . <br />HEC EAD Pr02ram. Many planners use the HEC EAD program to <br />compute annual damages. This can be done by directly inputting <br /> <br />either the damage-frequency function, or the three basic functions <br /> <br />from which the damage-frequency curve is derived. It is recommended <br /> <br />that planners become familiar with the HEC Users Manual before using <br /> <br />this program. This will help to reinforce your knowledge of the <br /> <br />subject, will give an insight into how the program works, and will <br />make you aware of some pitfalls to avoid when using the program. A <br /> <br />word of caution is in order. The program inserts points between <br /> <br />successive input points to more properly define a curve. For <br /> <br />example, in the case of a damage-frequency curve, nine points are <br /> <br />inserted between successive input points. It is important to <br /> <br />emphasize that both the curve, and the EAD computed therefrom, vary <br /> <br />according to the number of input points, consistent with the previous <br /> <br />discussion. It is, therefore, incumbent on the planner to insure <br /> <br />that sufficient points are inputted to properly define the <br /> <br />relationship. This is especially critical where the study area has <br /> <br />unusual characteristics that should be captured in the analysis. <br /> <br />Additionally, program output should always be carefully checked for <br /> <br />) <br /> <br />) <br /> <br />V-61 <br />