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<br />0.2 percent annual chance (SOO-year) flood is employed to indicate <br />additional areas of flood risk in the community. For each stream <br />studied in detail, the 100- and SOO-year flood plain boundaries. <br />have been delineated using the flood elevations determined at each <br />cross section. Between cross sections, the boundaries were inter- <br />polated using topographic maps at a scale of 1:2,400, with a contour <br />interval of 2 feet (Reference 1). <br /> <br />The 100- and SOO-year flood plain boundaries are shown on the Flood <br />Insurance Rate Map (Exhibit 2). On this map, the 100-year flood <br />plain boundary corresponds to the boundary of the areas of special <br />flood hazards (Zone AE); and the SOO-year flood plain boundary <br />corresponds to the boundary of areas of moderate flood hazards. <br />In cases where the 100- and SOO-year flood plain boundaries are <br />close together, only the 100-year flood plain boundary has been <br />shown. Small areas within the flood plain boundaries may lie above <br />the flood elevations but cannot be shown due to limitations of the <br />map scale and/or lack of detailed topographic data. <br /> <br />4.2 Floodways <br /> <br />The floodway is the channel of a stream, plus any adjacent flood <br />plain areas, that must be kept free of encroachment so that the <br />100-year flood can be carried without substantial increases in <br />flood heights. <br /> <br />No floodway was computed for the South Arkansas River or Poncha <br />Creek as part of 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 anal- <br />yses. These ZOnes are as follows: <br /> <br />Zone AE <br /> <br />zone AE is the flood insurance rate zone that corresponds to the <br />100-year flood plains that are determined in the Flood Insurance <br />Study by detailed methods. Whole-foot base flood elevations derived <br />from the detailed hydraulic analyses are shown at selected intervals <br />within this zone. <br /> <br />zone X <br /> <br />Zone X is the flood insurance rate zone that corresponds to areas <br />outside the SOO-year flood plain, areas within the SOO-year flood <br />plain, areas of 100-year flooding where average depths are less <br />than 1 foot, areas of 100-year flooding where the contributing <br />drainage area is less than 1 square mile, and areas protected from <br />the 100-year flood by levees. NO base flood elevations or depths <br />are shown within this zone. <br /> <br />10 <br />