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<br />~. <br /> <br />is to allow the user to specify data for one input data year by <br />modifying another input data year. For example, flow data may be input <br />for 1980 and these data multiplied by a factor 1.2 to compute flow data <br />for input data year 2000. The arithmetic operations by which an array <br />of data may be modified are: addition of a constant value, subtraction <br />of a constant value, or multiplication by a constant value. In addition, <br />a zero damage level can be specified by inputting a stage, flow, frequency <br />or damage value below which there is no damage. <br /> <br />9. STAGE-FLOW RELATIONSHIP (Rating Curve) <br /> <br />The stage-flow relationship relates the stage or water surface <br />elevation of a river at a specific location to the flow of the river at <br />that location. When the flood plain is divided into' reaches, one stage- <br />flow relationship is assumed to be representative for that reach. In such <br />a case, an array of stage and corresponding flow data are input (SQ and <br />QS cards). Up to 18 pairs of data may be used. One set of data is <br />provided for each reach, each input data year, and each plan, unless it is <br />desired to use the same data set for all input data years or all plans. <br />When the stage-flow relationship changes by year only the flow data need <br />be changed (QS card). Also, stage-flow data for any input data year or <br />plan can be modified or used to compute a stage-flow relationship for <br />another input data year or plan (RV card). A constant value may be added <br />or subtracted from each value in the stage or flow array (SQ or QS card), <br />or each value may be multiplied by a constant. <br /> <br />10. FREQUENCY, STAGE OR FLOW-DAMAGE RELATIONSHIP <br /> <br />Damage data may be related to either frequency, river stage or flow. <br />For each river reach a frequency, stage or flow-damage relationship is <br />required for the input data years being used for that reach unless it is <br />desired to use the same data set for all input data years. The same is <br />true for each plan. The relationships input for each reach are assumed <br />to represent the damage potential of that reach whether they are input as <br />aggregate functions (representing groups of structures) or as individual <br />structure functions. <br /> <br />Each plan may have up to 18 damage categories. The categories <br />specified are for all reaches, input data years, and plans, but damage <br />data need be input only for those categories pertinent to the reach <br />(CN card). <br /> <br />Stage data are input using an SD card, flow data using a QD card, and <br />damage data with a DG card. Up to 18 values may be input using each type <br />card. The same data set will be used for all input data years if only <br /> <br />7 <br />