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<br /> <br />I, <br /> <br />100 YEAR FLOOD PLAIN <br /> <br />FLQODWAY <br />FRINGE <br /> <br />FLOODWAY <br /> <br />LINE A. B IS THE FLooO ELEVATION BEFORE ENCROACHMENT <br />LINE C. D 1$ THE FLOOD ELEVATION AFTER ENCROACHMENT <br /> <br />Figure 3 <br /> <br />Floodways were not determined for bridge cross sections and, <br />therefore, were not I isted in Tables I & 2. The concept of a <br />floodway and encroachment upon a flood plain are not appl icable <br />to road and bridge crossings of a stream. Those lands dedicated <br />to roads and bridges cannot be encroached upon as other lands in <br />the flood plain and were, therefore, excluded from the floodway <br />analysis. <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, FIA has developed a <br />process to transform the data from the engineering study into flood <br />insurance criteria. This process includes the determination of reaches, <br />Flood Hazard Factors, and flood insurance zone designations for each <br />flooding source affecting Empire. <br /> <br />5.1 Reach Determination <br /> <br />Reaches are defined as lengths of watercourses having relatively <br />the same flood hazard, based on the average weighted difference <br />in water surface elevations between the 10- and 100-year floods. <br />This difference did not have a variation greater than that indicated <br />In the fol lowing table for more than 20 per cent of the reach: <br /> <br />Average Difference Between <br />10- and 100-year Floods <br /> <br />Less than 2 feet <br /> <br />Variation <br /> <br />0.5 foot <br /> <br />14 <br />