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<br />are not performed for <br />depths are shown within <br /> <br />such areas, <br />this zone. <br /> <br />no <br /> <br />base <br /> <br />flood <br /> <br />elevations <br /> <br />or <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. Whole-foot base flood elevations <br />derived from the detailed hydraulic analyses are shown at selected <br />intervals within this zone. <br /> <br />Zone X <br /> <br />Zone X is the flood insurance rate zone that corresponds to areas <br />outside the 500-year floodplain, areas within the 500-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 />6.0 FLOOD INSURANCE RATE MAP <br /> <br />The Flood Insurance <br />floodplain management <br /> <br />Rate Hap is <br />applicat ions. <br /> <br />designed <br /> <br />for <br /> <br />flood <br /> <br />insurance <br /> <br />and <br /> <br />For flood insurance applications, the map designates flood insurance <br />rate zones as described in Section 5.0 and, in the lOa-year floodplains <br />that were studied by detailed methods, shows selected whole-foot base <br />flood elevations or average depths. Insurance agents use the zones and <br />base flood elevations in conjunction with information on structures and <br />their contents to assign premium rates for flood insurance policies. <br /> <br />For floodplain management applications, the map shows by tints, screens, <br />and symbols, the 100- and 500-year floodplains, floodways, and the <br />locations of selected cross sections used in the hydraulic analyses and <br />floodway computations. <br /> <br />7.0 OTHER STUDIES <br /> <br />In Hay 1970, the SCS published a Floodplain Information report for the <br />Boxelder Creek watershed (Reference 13). The report presented <br />floodplains and profiles for the watershed with no flood detention <br />structures and with all proposed structures constructed. Because this <br />study is based upon existing conditions with some structures completed, <br />no agreement between profiles or flood boundaries can be expected. <br /> <br />Portions <br />existing <br /> <br />of this Flood Insurance study <br />hydrologic and hydraulic technical <br /> <br />were prepared <br />and scientific <br /> <br />by compi ling <br />data prepared <br /> <br />9 <br />