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zone was assigned one of the following flood insurance zone designations: Zone A: Special Flood Hazard Areas inundated by the lOO~yea:r - -flood, det-ermin:ed by approximate methods; no base flood elevations shown or FHFs determined. Zones A2-A5: Special Flood Hazard Areas inundated by the lOO-year flood, determined by detailed methods; base flood elevations shown, and zones subdivided according to FHFs. Zone B: Areas between the Special Flood Hazard Areas and the limits of the 500-year flood, including areas of the 500-year floodplain that are protected from the 100-year flood by dike, levee, or other water control structure; also areas subject to certain types of 100- year shallow flooding where depths are less than 1.0 foot; and areas subject to 100-year flooding from sources with drainage areas less than 1 square mile. Zone B is not subdivided. Zone C: Areas of minimal flooding. Zone .D: Areas of undetermined, but possible flood hazard. The flood elevation differences, FHFs, flood base flood elevations for each flooding detailed methods in the county are summarized insurance zones, source studied in Table 3. and by 5.4 Flood Insurance Rate Map Description Th,fFloodurnsuranceR..l:e Map for riellta County is, for insuranc:e purposes, the principal result of the Flood Insurance Study. This map (published separately) contains the official delineation of flood insurance zones and base flood elevation lines. Base flood elevation lines show the locations of the expected whole- foot water-surface elevations of the base (lOO-year) flood. This map is developed in accordance with the latest flood insurance map preparation guidelines published by the Federal Emergency Management Agency. 6.0 OTHER STUDIES A Flood Hazard Boundary Map - has been previously published for Delta County (Reference 20). Due to the more detailed analyses used in this study, it supersedes the Flood Hazard Boundary Map. 40