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<br />I~ <br /> <br />100-YEAR FLOOD PLAIN <br /> <br />'1 <br /> <br />FLOODWAY <br />FRINGE <br /> <br /> <br />FLOOD ELEVATION WHEN <br />CONFINED WITHIN FLOOQWAY <br /> <br /> <br />AREA OF FLOOD PLAIN THAT COUlD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />FLOOOWAY <br /> <br />FLOODWA Y <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br /> <br />o <br /> <br />... <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLt\IN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE Floce ELEVATION AFTER ENCAOACHME~T. <br />'SURCHARGE IS NOT TO EXCEeD 1.0 FOOT (FIA REQUIREMENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />Floodway Schematic <br /> <br />In orear to establish actJarial ins~ran~e rates, the rederal =~su~ance <br />Administration has developed a process to transform the data from the <br />engineering study into flood insurance criteria. This process includes <br />the determination of reaches, Flood Hazard Factors, and flood insurance <br />Zone designations for each flooding source studied in detail affecting <br />the Town of ~1inturn. <br /> <br />5.1 Reach Determinations <br /> <br />Reacr_es are defined as lengths of ,-,'atercourses r.aving relatively <br />the same flood hazard, based on the average weight.ed diffe::::-encc in <br />water-surface elevations between the 10- and lOO-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 />10 <br />