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<br />one set is provided. <br /> <br />A stage or flow-damage relationship for an input data year or plan <br />category may be modified or used to compute a similar relationship for <br />another input data year or plan (RV card). A constant value may be <br />added, subtracted or multiplied to .produce a new damage array. In <br />addition, a value may be specified below which there is no damage. <br /> <br />11. STAGE OR FLOW-FREQUENCY RELATIONSHIP <br /> <br />A flow-frequency relationship for a reach of river represents the <br />percent chance that a certain magnitude of the river flow will be <br />exceeded. Quite often.a single relationship is considered representative <br />of many reaches or an entire flood plain. In the program, frequency data <br />are input using an FR card and corresponding stage or flow data using the <br />SF or QF cards. When frequency-damage data are being used the damage data <br />are input using the DG card. Up to 18 values may be input using each. <br />type card. The frequency array on the FR card need only be input for the <br />first reach, each subsequent reach will use the same array until another <br />FR card is encountered. Corresponding stage 0;' flow data are provided for <br />each reach, input data year being used for that reach, and plan unless <br />it is indicated on the SF or QF cards that one data set is to be used <br />for all input data years and/or all plans within the reach. <br /> <br />Data on the SF (stage), QF (flow) orFR (frequency) cards may be <br />modified or used to compute a stage or flow-frequency relationship for <br />another input data year or plan by using the RV card. A constant value <br />may be added or subtracted, the array multiplied by a constant, or a <br />value of stage, flow, or frequency specified beyond which no damage is <br />computed. <br /> <br />12. SPECIFIC EVENT FLOOD DAMAGE <br /> <br />Sometimes it is desired to compute the damage which is estimated to <br />occur if a specific flood event should occur. While the stage or flow <br />damage data input to the program will normally contain values based upon <br />specific historic events, it is often desired to compute damage for events <br />other than those used to derive the input relationship. For this computa- <br />tion stage or flow data are input using the SD or QD cards respectively <br />and damage data using the DG card. The damage data input is associated <br />with a specific input data year, plan and damage category. The number of <br />flood events for which it is desired to compute estimated damage is input <br />on the FR card. The actual stage or flow for each event is specified on <br />the SF card if it is stage or QF card if it is flow. The stage-flow <br />relationship will need to be provided if flow-frequency and stage-damage <br /> <br />8 <br /> <br />III <br />