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Zone A: Special Flood Hazard Areas inundated by the IOO-year flood, determined by approximate methods; no base flood elevations shown or FHFs determined. Zones A2 and A4: Special Flood Hazard Areas inundated by the 100-year flood; with 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; areas that are protected from the 100- or 500-year floods by dike, levee, or other local water-control structure; areas subject to certain types of IOO-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 I square mile. Zone B is not subdivided. Zone c: Areas of minimal flood hazard; not subdivided. The flood elevation differences, FHFs, flood insurance zones, and base flood elevations for each flooding source studied in detail in the community are summarized in Table 4. 5.4 Flood Insurance Rate Map Description The Flood Insurance Rate Map for Black Hawk is, for insurance purposes, the principal product of the Flood Insurance Study. This map contains the official delineation of flood insurance zones and base flood elevations. Base flood elevation lines show the locations of the expected whole-foot water-surface elevation of the base (IOO-year) flood. The base flood elevations and zone numbers are used by insurance agents, in conjunction with structure elevations and characteristics, to assign actuarial insurance rates to structures and contents insured under the NFIP. 6.0 OTHER STUDIES This study supersedes the IOO-Year Floodplain and Floodway Map for Black Hawk prepared by the Denver Regional Council of Governments (Reference 15). Flood Hazard Boundary Maps have been prepared for the City of Central City and the unincorporated areas of Gilpin County (References 16 and 17). 22