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<br />Ie <br /> <br />1 OO-YEAR FLOOD PLAIN <br /> <br />'I <br /> <br />FLOaDWAY <br />FRINGE <br /> <br /> <br />FLOQDWAY <br /> <br />FLOODWAV <br />FRINGE <br /> <br />STREAM <br />CHANNEL <br /> <br />FLOOD EL.EVATION WHEN <br />CONFINED WITHIN FLOODWAY <br /> <br /> <br />SURCHARGE. <br /> <br />AREA OF FLOOD PLAIN THAT COULD <br />BE USED FOR DEVELOPMENT BY <br />RAISING GROUND <br /> <br />LINE AS IS THE FLOOD ELEVATION BEFORE ENCROACHM~NT. <br />LINE CD IS THE FLOOD ELEVATION AFTER ENCAOACHMENT. <br />"SURCHARGE IS NOT TO EXceeD 1.0 FOOT (FIA REQUIRE~ENT) OR LESSER AMOUNT IF SPECIFIED BY STATE. <br /> <br />Figure 2. Floodway Schematic <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />In order to establish actuarial insurance rates, the Federal Insurance <br />Administration has developed a proc~ss 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 City of Greenwood Village. <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 Betweep <br />10- and 100-vea~loods <br /> <br />VariatiQI) <br /> <br />Less than 2 feet <br /> <br />0.5 foot <br /> <br />12 <br />