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<br />I- <br /> <br />1 OO~YEAR FL.OOD PLAIN <br /> <br />-, <br /> <br />FLQODWAV <br />FRINGE <br /> <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />FLOODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br /> <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CO IS THE FLOOD ELEVATION AfTER ENCROACHMENT. <br />.SURCHARGE IS NOT TO EXCEeD 1.0 FOOT (F1A REQUIREMENT) OA LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />The IOO-year floodflows did not exceed the banks on either Soda <br />Creek or Virginia Canyon within the corporate limits of Idaho <br />Springs; therefore, no further analyses were done on those streams <br />to determine a floodway. The floodway limits on these streams <br />coincide with the 100-year flood limits and the existing stream <br />banks. <br /> <br />No floodway determination was done for Gilson Gulch or the Gulch <br />above 8th Avenue because these areas are subject to shallow flooding <br />by the 100-year flood with unpredictable flow paths and depths of <br />less than 1.0 foot. <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, the Federal Insurance <br />Administ~tion has developed a process to transform the data from the <br />engineering study into flood insurance criteria. This process includes <br />the determination of reaches, Flood Hazard Factors, and flood insurance <br />zone designations for each flooding source studied in detail affecting <br />Idaho Springs, Colorado. <br /> <br />13 <br />