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<br />boundary has been shown. <br />boundaries may lie above the <br />due to limitations of the <br />topographic data. <br /> <br />Small areas within the floodplain <br />flood elevations but cannot be shawn <br />map scale and/or lack of detailed <br /> <br />4.2 Floodways <br /> <br />Encroachment on floodplains, such a" ~>-""2-::ures and fill, reduce:. <br />flood-carrying capacity, increases flood heights and velocities, <br />and increases flood hazards in areas beyond the encroachment <br />itself. One aspect of floodplain management development against <br />the economic gain from floodplain development against the resulting <br />increase in flood hazard. For purposes of the NFIP, a floodway is <br />used as a tool to assist local communities in this aspect of <br />floodplain management. Under thi s concept, the area of the 100- <br />year floodplain is divided into a floodway and a floodway fringe. <br />The floodway is the channel of a stream, plus any adjacent <br />floodplain areas that must be kept free of encroachment so that the <br />IOO-year flood can be carried without substantial increases in <br />flood heights.. Minimum federal standards 1 imi t such increases to <br />1.0 foot, provided that hazardous velocities are not produced. <br />Floodways were not computed for this study. <br /> <br />5.0 INSURANCE APPLICATION <br /> <br />For flood insurance rating purposes flood insurance zone designations <br />are ass igned to a communi ty based on the results of the engineering <br />analyses. These zones are as follows: <br /> <br />Zone AE <br /> <br />Zone AE is the flood insurance rate zone that corresponds to the <br />lOa-year floodplains that are determined in the Flood Insurance <br />Study by detailed methods. In most instances, whole-foot base <br />flood elevations derived from the detailed hydraulic analyses are <br />shown at selected intervals within this zone. <br /> <br />Zone AO <br /> <br />Zone AO is the flood insurance rate zone that corresponds to the <br />areaS of laO-year shallow flooding (usually sheetflow on sloping <br />terrain) where average depths are between 1 and 3 feet. Average <br />whole-foot depths derived from the detailed hydraulic analyses are <br />shown 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 floodplain, areas within the SOO-year <br />floodplain, areas of lOa-year flooding where average depths are <br />less than 1 foot, areas of lOa-year flooding where the contributing <br />drainage area is less than 1 square mile, and areaS protected from <br />the lOa-year flood by levees. No base flood elevations or depths <br />are shown within this zone. <br /> <br />8 <br />