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damage data on the appropriate reach cards for each reach and input data year. If, within a reach, several plans have the same stage flow or damage relationship, the data set need only be input for the first plan and it will be used for all subsequent plans until a data set is input for another plan. Also, one plan may be made equivalent to another within a reach (RV card). 8. INPUT DATA YEARS Stage, flow, or damage data can be input, and expected annual damage computed for historic years, a study year, a base year, and future years-- up to a total of nine different years. These years are termed input data years and are shown in the diagram below. Expected annual damage computed from these data is assumed to occur at the end of the respective year. . t t t L_.l_l_l_ ~ Study Base Historic Year Year Years (Up to 3) Future Year Future Year Future Year ~ Input Data Years f\l.pto 9 maybe used) The purpose of inputting data for several different years is to accommodate changes in hydrologic, hydraulic and economic data which occur over time. For example, it may be desired to compute expected annual damage for historic years with non urban land use and channel conditions, or for future years with urban land use or channel conditions. The years selected are identified on the DY card. For each reach only those input data years desired need be selected from those identified on the DY card. For each reach the frequency array applies to all input data years (FR card). When the data are available for an input data year it should be input, if it is the same for all input years, one set of data can be input and it will be used for all other input data years for that reach and plan. Within a reach stage, flow, frequency or damage data may be modified for an input data year and plan (RV card). The purpose of this modification 6 I ~