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<br />I" <br /> <br />100..YEAR FLOOD PLAIN <br /> <br />~I <br /> <br />F LOOOWA Y <br />FRrNG{: <br /> <br /> <br />FLOOOWAY <br /> <br />FLOOOWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />LINE A8 IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />· 9UACHAAOE 18 NOT TO EXCEED I. 0 FOOT t FEMA REQUIREMENT J OR LESSEff AMOUNT IF SPECIFIED BY STATE. <br /> <br />FLOODWAY SCHEMATIC <br /> <br />Figure 2 <br /> <br />5.1 Reach Determinations <br /> <br />Reaches are defined as lengths of watercourses having relatively the <br />same flood hazard, based on the average weighted difference in water- <br />surface el evations between the 10- and IOO-year f1 oads. Thi s <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 />Average Difference Between <br />10- and IOO-year Floods <br /> <br />Variation <br /> <br />Less than 2 feet <br />2 to 7 feet <br /> <br />0.5 foot <br />1.0 foot <br /> <br />One reach meeting the above criteria was required for the flooding <br />sources of the City of Salida. The location of the reach ;s shown <br />on the Flood Profile. <br /> <br />5.2 Flood Hazard Factors <br /> <br />The Flood Hazard Factor is used to correlate flood infonnation with <br />insurance rate tables. Correlations between property damage from <br />floods and their assigned FHFs are used. to set actuarial insurance <br />premium rate tables based on FHFs from 005 to 200. <br /> <br />The FHF for a reach ; s the average we; ghted di fference between the <br />10- and IOO-year flood water-surface el evations ex.pressed to the <br /> <br />11 <br />