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<br />As shown on the Flood Boundary 'and Floodway Map (Exhibit 2), the <br />floodway boundaries were computed at cross sections. Between cross <br />sections, the boundari~s were interpolated, In cases where the <br />floodway and 100-year flood plain boundaries are either close <br />together or collinear, only th~ floodway boundary has been shown. <br /> <br />The area between the floodway and 100-year flood plain boundaries <br />is termed thefloodwayfringe, Thefloodway fringe encompasses <br />the portion of the flood plainithat could be completely obstructed <br />without increasing the water-surface elevation of the 100-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 develo~nent are'shown in Figure 2, <br /> <br />I ~ <br /> <br />100.YEAR FLOOD PL.AIN <br /> <br />-I <br /> <br />FLOOOWAY <br />FRINGE <br /> <br />, F;LOOOWAV <br /> <br />FLOODWAV <br />FRINGE <br /> <br /> <br />STREAM <br />CHANNEL <br /> <br />FL.OOD ELEVATION WHEN <br />CONFINED WITHIN FLOOOWAV <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED fOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHM.e:NT. <br />LINE CO IS THE FLOOO ELEVATION AFTER ENCROACHMENT. <br />.SURCHARGE IS NOT TO EXCEED 1;0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIEO BY STATE. <br /> <br />Figure 2. E'loodway Schematic <br /> <br />5,0 INSURANCE APPLICATION <br /> <br />To establish actuarial insurilnce ratli's, data from the engineering study <br />must be transformed j nto flo<,d insurance cri ter ia, This process includes <br />the determination of reaches, Flood Hazard Factors, and flood insurance <br />zone designations for each f:ooding source studied in detail affecting <br />the City of Fountain. <br /> <br />9 <br />