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<br />I~ <br /> <br />1 aD-YEAR FLOOD PLAIN <br /> <br />-, <br /> <br />FLDODWAY <br />F A I NG E <br /> <br /> <br />FLQODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOQOWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />AAISING GROUND <br /> <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />"SURCHARGE 15 NOT TO ExceeD 1.0 FOOT (FIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 6. <br /> <br />Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In qrder 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 each flooding source studied in detail affecting the <br /> <br />city of Wiggins. <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 />2 to 7 feet <br /> <br />1. 0 foot <br />