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<br />Between cross sections, the boundaries were interpolated using <br />topographic maps at a scale of 1:24,000, with a contour interval <br />of 10 feet (Reference 7). <br /> <br />The 100- and SOD-year floodplain boundaries are shown on the <br />Flood Insurance Rate Map (Exhibit 2). On this map, the 100-year <br />floodplain boundary corresponds to the boundary of the areas of <br />special flood hazards (Zones A and AE) and the SOD-year <br />floodplain boundary corresponds to the boundary of areas of <br />moderate flood hazards. In cases where the 100- and SOD-year <br />floodplain boundaries are close-together, only the 100-year <br />floodplain boundary has been shown. Small areas within the <br />floodplain boundaries may lie above the flood elevations but <br />cannot be shown due to limitations of the map scale and/or lack <br />of detailed topographic data. <br /> <br />The 100-year floodplain boundaries for the South Platte River, <br />studied by approximate methods, were delineated using the <br />previously referenced topographic maps (Reference 7). <br /> <br />Approximate 100-year floodplain boundaries <br />the study area were taken directly from the <br />Map for Logan County (Reference 10). <br /> <br />in some portions of <br />Flood Hazard Boundary <br /> <br />4.2 Floodways <br /> <br />The floodway is the channel of a stream, plus any adjacent <br />floodplain areas, that must be kept free of encroachment so that <br />the 100-year flood can be carried without substantial increases <br />in flood heights. Floodways were not computed for the reports <br />used to prepare this study; therefore, no floodways have been <br />included in this study. <br /> <br />S.O INSURANCE APPLICATION <br /> <br />For flood insurance rating purposes, flood insurance zone designations <br />are assigned to a community based on the results of the engineering <br />analyses. These zones are as follows: <br /> <br />Zone A <br /> <br />Zone A is the flood insurance rate zone that corresponds to the 100- <br />year floodplains that are determined in the Flood Insurance Study by <br />approximate methods. Because detailed hydraulic analyses are not <br />performed for such areas, no base flood elevations or depths are <br />shown within this zone. <br /> <br />Zone AE <br /> <br />Zone AE is the flood <br />100-year floodplains <br /> <br />insurance <br />that are <br /> <br />rate zone <br />determined <br /> <br />that corresponds to the <br />in the Flood Insurance <br /> <br />8 <br />