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<br />floodway and lOa-year flood plain boundaries are either close <br />together or collinear, only the floodway boundary has been shown. <br /> <br />The area between the floodway and lOa-year flood plain boundaries <br />is termed the floodway fringe. The floodway fringe encompasses <br />the portion of the flood plain that could be completely obstructed <br />without increasing the water-surface elevation of the lOa-year <br />flood by more than 1.0 foot at any point. Typical relationships <br />between the floodway and the floodway fringe and their significance <br />to flood plain development are shown in Figure 10. <br /> <br />I ( <br /> <br />10Q.YEAA FLOOD PLAIN <br /> <br />-I <br /> <br />FLDODWAV <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 />FlDODWAV <br /> <br />FLDOOWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT, <br />.SURCHARGE ISNOTTOEXCEED 1.0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFfED BY STATE. <br /> <br />Figure 10. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />To establish actuarial insurance rates, data from the engineering study <br />must be transformed 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 />the Town of winter Park. <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as sections of flood plain that have relatively <br />the same flood hazard, based on the average weighted difference in <br />water-surface elevations between the 10- and lOa-year floods. This <br /> <br />26 <br />