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<br />I ( <br /> <br />100,YEAR FLOODPLAIN <br /> <br />.1 <br /> <br />( <br /> <br />FLOODWAY -.. ~ <br />FRINGE <br /> <br />FLOODWAY <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM _ <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />ENCROACHMENT <br /> <br />ENCROACHMENT <br /> <br />AREA OF FLOODPLAIN THAT COULD BE USED <br />FOR DEVELOPMENT BY RAISING GROUND <br /> <br /> <br />. <br /> <br />FLOOD ELEVATION BEFORE <br />ENCROACHMENT ON FLOODPLAIN <br /> <br />LINE AB 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 5. Floodway Schematic <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 />Average Difference Between <br /> <br />10- and 100-Year Floods <br /> <br />variation <br /> <br />Less than 2 feet <br />2 to 7 feet <br />7.1 to 12 feet <br />More than 12 feet <br /> <br />0.5 foot <br />1.0 foot <br />2.0 feet <br />3.0 feet <br /> <br />.' <br /> <br />. <br /> <br />The locations of reaches determined for the flooding sources of the <br />unincorporated areas of Weld County are shown on the Flood Profiles <br />and summarized in Table 3. The reach of Eaton Draw affecting the <br />Town of Eaton is shown on Profile 34P. <br /> <br />5.2 Flood Hazard Factors <br /> <br />The FHF is the FEMA device used to correlate flood information with <br />insurance rate tables. Correlations between property damage from <br /> <br />18 <br />