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<br />The results of these floodway computations are tabulated <br />at selected cross sections for each stream studied <br />(Table 2). As shown on the Floodway Map (Exhibit 2), <br />the floodway boundaries were determined at cross sections; <br />between cross sections, the boundaries were interpolated. <br /> <br />:. <br /> <br />The area between the floodway and the boundary of the <br />100-year flood is termed the floodway fringe. The <br />floodway fringe thus encompasses the portion of the <br />flood plain that could be completely obstructed without <br />increasing the water-surface elevation of the lOa-year <br />flood more than 1.0 foot at any point. Typical relation- <br />ships between the floodway and the floodway fringe and <br />their significance to flood plain development are shown <br />in Figure 8. <br /> <br />I. <br /> <br />1 OO-YEAR FLOOD PLAIN <br /> <br />-, <br /> <br />FLOODWAY <br />FRINGE <br /> <br /> <br />FLOODWAY <br /> <br />FLOOOWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />SURCHARGE- <br />--- <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USEO FOR DEVELOPMENT BY <br />RAISJi"G GROUND <br /> <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 />Figure 8. <br /> <br />Floodway Schematic <br /> <br />5.0 <br /> <br />INSURANCE APPLICATION <br /> <br />. <br /> <br />In order to establish actuarial insurance rates, the Federal <br />Insurance Administration has developed a process to transform <br />the data from the engineering study into flood insurance <br />criteria. This process includes the determination of reaches, <br />Flood Hazard Factors, and flood insurance zone designations <br />for each flooding source affecting the City of Littleton. <br /> <br />18 <br />