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~ Zone A7: Special Flood Hazard Areas inundated by the 100-year flood, determined by detailed methods; base flood elevations shown, and zones subdivided according to Flood Hazard Factors. f Zone B: Areas between the Special Flood Hazard Areas and the limits of the 500-year flood, including areas of the 500-year flood plain that are protected from the lOa-year flood by dike, levee, or other water control structure; also areas subject to certain types of laO-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. The flood elevation differences, Flood Hazard Factors, flood insur- ance zones, and base flood elevations for the flooding source studied in detail in the community is summarized in Table 3. f~ , , 5.4 Flood Insurance Rate Map Description The Flood Insurance Rate Map for the Town of Superior is, for insurance purposes, the principal result of the National Flood Insurance Study. This map (published separately) contains the official delineation of flood insurance zones and base flood eleva- tion 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 Insur- ance Administration. j ~ ,,'j 6.0 OTHER STUDIES The U.s. Soil Conservation Service completed a study of Coal Creek and Rock Creek in October 1976 (Reference 2). Hydrologic and hydraulic source material and methodology used in the U.S. Soil Conservation Service study was reviewed and found to be satisfactory and acceptable. The flood data generated by the U.S. Soil Conservation Service forms the basis for this report. . , The Federal Insurance Administration published a Flood Hazard Boundary Map for the Town of Superior on June 4, 1976 (Reference 9), and it is in agreement with the boundaries determined by this study. 12