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Zone AO: Special Flood Hazard Areas inundated by types of laO-year shallow flooding where depths are between 1.0 and 3.0 feet; depths are shown, but no Flood Hazard Factors are determined. Zones AI, A2, A3, and AS: Special Flood Hazard Areas inundated by the IOO-year flood, determined by detailed methods; base flood elevations shown, and zones subdivided according to Flood Hazard Factors. Zone B: Areas between the Special Flood Hazard Areas and the limits of the SOO-year flood, including areas of the SOO-year flood plain that are protected from the IOO-year flood by dike, levee, or other water control structure; also areas subject to certain types of IOO-year shallow flooding where depths are less than 1.0 foot; and areas subject to IOO-year flooding from sources with drainage areas less than I 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, Flood Hazard Factors, flood insur- ance zones, and base flood elevations for each flooding source studied in detail in the community are summarized in Table 4. S.4 Flood Insurance Rate Map Description The Flood Insurance Rate Map for the Town of Silverton and the unin- corporated areas of San Juan County is, for insurance 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 eleva- tions of the base (lOO-year) flood. This map is developed in accordance with the latest flood insurance map preparation guide- lines published by the Federal Insurance Administration. 19