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<br />lOO-year flood boundaries are close together or col inear, only the <br />floodway boundary has been shown. Only the fl oodway boundari es for <br />Willow Creek have been evaluated during this study. <br /> <br />The area between the fl oodway and the boundary of the 100-year flood <br />is termed the fl oOdway fringe. The fl oodway fringe thus encompasses <br />the portion of the flood plain that could be completely obstructed <br />wi thout increasing the water- surface el evation of the 100-year fl ood <br />more than 1.0 foot at any point. Typical relationships between the <br />floodway and the floodway fringe and their significance to flood <br />plain development are shown in Figure 2. <br /> <br />I- <br /> <br />100-YEAR FLOOD PLAIN <br /> <br />-I <br /> <br />FLOOOWAY <br />FRING.E <br /> <br /> <br />FLOOQWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAV <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />LINE AS 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) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />FLOODWAY SCHEMATIC <br /> <br />Figure 2 <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, FEMA has developed a pro- <br />cess to transform the data from the engineering study into flood insurance <br />criteria. This process includes the determination of reaches, Flood Hazard <br />Factors (FHF). and flood insurance zone designations for each flood source <br />studies in detail affecting the City of Lamar. <br />