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Zone X Zone X is the flood insurance rate zone that corresponds to areas outside the SOD-year flood plain, areas within the SOD-year flood plain, areas of 100-year flooding where average depths are less than 1 foot, areas of 100-year flooding where the contributing drainage area is less than 1 square mile, and areas protected from the 100-year flood by levees. No base flood elevations or depths are shown within this zone. Zone D zone D is the flood insurance rate zone that corresponds to unstudied areas where flood hazards are undetermined, but possible. 6.0 FLOOD INSURANCE RATE MAP The Flood Insurance Rate Map is designed for flood insurance and flood plain management applications. For flood insurance applications, the map designates flood insurance rate zones as described in Section S.O and, in the 100-year flood plains that were studied by detailed methods, shows selected whole-foot base flood elevations or average depths. Insurance agents use the zoneS and base flood elevations in conjunction with information on structures and their contents to assign premium rates for flood insurance policies. For flood plain management applications, the map shows by tints, screens, and symbols the 100- and SOD-year flood plains, the f1oodways, and the locations of selected cross sections used in the hydraulic analyses and f100dway computations. 7.0 OTHER STUDIES Flood Insurance Studies have been published for the City of Monte Vista and the Town of Del Norte (References 1 and 2, respectively). The infor- mation presented in those studies is in general agreement with this study. This Flood Insurance Study supersedes the Flood Hazard Boundary Map for Rio Grande County (Reference 11). Flood Insurance Studies have been published for Alamosa and Archuleta Counties in Colorado, and are in general agreement with this study (References 12 and 13). 14