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<br />C. Re-do HydroloEic Analysis <br /> <br />The total amount of discharge for a given frequency of storms can be <br /> <br />estimated by calculating the combined effects of the hydro graphs for each <br /> <br />sub-basin. The rainfall/frequency relationship is held constant. The new <br /> <br />hydro graph is computed for each sub-basin by use of a simulation model <br /> <br />that calculates and applies new runoff coefficients. <br /> <br />D. Review Hvdraulic Analysis <br /> <br />For without-project conditions, hydraulic changes wi~l be limited to <br /> <br />any impending physical change, such as a bridge replacement, or <br /> <br /> <br />anticipated long-term physical process that would affect the geometry of <br /> <br /> <br />the channel and consequently affect the stage-discharge relationship. <br /> <br /> <br />E. Calculate New DamaEe-Freauency Relationshius <br /> <br />1) Update of Land Use Information by Step <br />2) Apply New Elevation-Frequency Relation~hip <br /> <br />STEP FIVE: CALCUIATE EQUIVALENT ANNUAL DAMAGES <br /> <br />Equivalent annual damages are the discounted values of damages after <br /> <br />the mandated interest rate has been applied. While projections are <br /> <br />limited to 50 years, equivalent annual damages are based on the entire <br /> <br />project life, up to 100 years. <br />The elevation-damage relationship is calculated by the same procedure <br /> <br /> <br />illustrated in Step 7 of Chapter V. E~evation-damage curves change as a <br /> <br /> <br />result of work done in the previous four steps. <br /> <br /> <br />Equivalent annual damages are calculated using established procedures <br /> <br /> <br />similar to calculating average annual damages as illustrated in Chapter V. <br /> <br />VI-12 <br />