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<br />\- <br /> <br />100.YEAR FLOOD PLAIN <br /> <br />-I <br /> <br />FLDQDWAY <br />FRINGE <br /> <br /> <br />FLOOD ELE:VATION WHEN <br />CONFINED WITHIN FLDODWAY <br /> <br /> <br />AREA OF FLOOO PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />FLOODWAY <br /> <br />FLOOOWAY <br />FRINGE <br /> <br />ST REAM <br />CHANNEL <br /> <br />c <br /> <br />. , <br /> <br /> <br />o <br /> <br />FLOOD ELEVATION <br />BEFOREENCRQACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AB IS THE FLOOD ELEVATION BEfOAE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br />.SURCHARGE ISNOTTOexCEED 1.0 FOOT (FEMA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 6. Floodway Schematic <br /> <br />5.0 <br /> <br />INSURANCE APPLICATION <br /> <br />" <br /> <br />In order to establish actuarial insurance rates, the Federal Emergency <br />Management Agency has developed a process to transform the data from <br />the engineering study into flood insurance criteria. This process <br />includes the determination of reaches, Flood Hazard Factors (FHFs), <br />and flood insurance zone designations for each flooding source studied <br />in detail affecting the Town of Jamestown. <br /> <br />5.1 Reach Determinations <br /> <br />" <br /> <br />Reaches are defined as lengths of watercourses having relatively <br />the same flood hazard, based on the average weighted difference <br />in water-surface elevations between the 10- and 100-year floods. <br />This difference does not have a variation greater than that indicated <br />in the following table for more than 20 percent of the reach: <br /> <br />Average Difference Between <br />10- and 100-Year Floods <br /> <br />1, <br /> <br />Var ia tion <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 />14 <br />