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<br />Ie <br /> <br />100.YEAR FLOOD PLAIN <br /> <br />) I <br /> <br />FLOODWAY <br />FRINGE <br /> <br /> <br />FLOODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />,. <br /> <br />STREAM <br />CHANNEL <br /> <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br />ENCRO~MENT ~ <br /> <br />, <br />i <br /> <br />ENCROACHMENT <br />-r <br /> <br /> <br />. <br /> <br />"-- <br />-L <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />. ~-:/i- . ~_. .. ~'''''4..Q' <br />-=- FLOOD ELEVATION <br />~ BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AB IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />'SURCHARGE IS NOT TO EXCEED 1.0 FOOT (FIA REQUIREMENT) OF! LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 3. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, the Federal Insurance <br />Administration 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 the segments of each flooding source studied in <br />detail affecting the Town of Rangely. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as lengths of watercourses having relatively the <br />same flood hazard, based on the average weighted difference in <br />water-surface elevations between the 10- and 100-year floods. This <br />difference does not have a variation greater than that indicated in <br />the following table for more than 20 percent of the reach. <br /> <br />Average Difference Between <br />10- and 100-year Floods <br /> <br />Variation <br /> <br />if <br /> <br />Less than 2 feet <br />2 to 7 feet <br /> <br />0.5 foot <br />1. 0 foot <br /> <br />.Ii <br /> <br />Two reaches meeting the above criteria were required for the flooding <br />sources of .the Town of Rangely. These included one each on the <br />White River and Dragon Wash. The locations of the reaches are shown <br />on the Flood Profiles (Exhibit 1). <br /> <br />15 <br /> <br />j <br />