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<br />I' <br /> <br />100,VEAR FLOOD PLAIN <br /> <br />-, <br /> <br />F LOODWA Y <br />FRINGE <br /> <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 />FLOODWAV <br /> <br />FLOODWAY <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br /> <br />o <br /> <br />FLOOD ELEVATION <br />BEFORE ENCROACHMENT <br />ON FLOOD PLAIN <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHMENT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCROACHMENT. <br /> <br />Figure 23~ Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, the Federal Emergency <br />Manag~ment Agency 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 />Steamboat Springs. <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 <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 />Average Difference Between <br />10- and 100-year Floods <br /> <br />Less than 2 feet <br />2 to 7 feet <br /> <br />variation <br /> <br />0.5 foot <br />1. 0 foot <br /> <br />34 <br />