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<br />The area between the floodway and the boundary of the 100-year <br />flood is termed the floodway fringe. The floodway fringe thus <br />encompasses the portion of the flood plain that could be completely <br />obstructed without increasing the water-surface elevation of the <br />100-year flood more than 1,0 feet at any point. Typical <br />relationships between the floodway and the floodway fringe and <br />their significance to flood plain development are shown in <br />Figure 2. <br /> <br />I- <br /> <br />100..VEAR FLOOD "LAIN <br /> <br />-I <br /> <br />FLOODWAY <br />FRINO.Ei <br /> <br /> <br />FLOOOWAY <br /> <br />FLOOOWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOOOWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br /> <br />LINE AB 1$ THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />. SlJIOCHAROE 18 NOT TO ExceEO I. 0 FOOT I FE"A REQUIREMEHTI OR LES8ER AMOUNT IF _CIFIED IIY IITATE. <br /> <br />FLOODWAY SCHEMATIC <br /> <br />Fi gure 2 <br /> <br />5,0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, FIA has developed a <br />process to transform the data from the engineering study into flood <br />insurance criteria. This process includes the determination of reaches, <br />Flood Hazard Factors (FHF), and flood insurance zone designations for <br />each flooding source studied in detail affecting the City of Gunnison, <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as lengths of watercourses having relatively <br />the 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 />11 <br />