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<br />Zone X <br /> <br />Zone X is the flood 1nsurance rate zone a correspon s 0 areas <br />outside the SOD-year flood plain, areas within the SOD-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 wi thin this zone. <br /> <br />6.0 FLOOD INSURANCE RATE MAP <br /> <br />The Flood Insurance Rate Map is designed for flood insurance and flood <br />plain management applications. <br /> <br />For flood insurance applications, the map designates flood insurance <br />rate zones as described in Section S.O and, in the 100-year flood plains <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 flood plain management applications, the map shows by tints, <br />screens, and symbols, the 100- and SOD-year flood plains, the floodways, <br />and the locations of selected cross sections used in the hydraulic <br />analyses and floodway computations. <br /> <br />7.0 OTHER STUDIES <br /> <br />A 1976 ODE Flood Plain Information report (Reference 12) includes deter- <br />mination of 10-, SO-, 100-, and SOD-year flood discharges and water- <br />surface profiles. This study is based on present eonditions; however, <br />the COE data were used to show flood plain boundaries. <br /> <br />In November 1977, Boward Needles Tammen & Bergendoff completed a study <br />(Reference 21) fo the UDFCD. The 10-, SO-, 100-, and SOD-year flood <br />discharges were calculated for future flood conditions and the 100-year <br />profiles and flood plain limits are shown. The results of this study <br />for Sulphur and Tallman Gulches are based on the present conditions of <br />the study area. Therefore, the results of this study are necessarily <br />different from those of the 1977 study. <br /> <br />Because this Flood Insurance Study has been prepared using information <br />from the Type IS and 19 Flood Insurance Studies for Douglas County, <br />Colorado (References 1 and 2), the studies are in agreement. <br /> <br />18 <br />