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. . . . Each zone was assigned one of the following flood insurance zone designations: Zones A3 and AS: Special Flood Hazard Areas inundated by the lOa-year flood, determined by detailed methods; base flood eleva- tions 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 SOQ-year flood plain that are protected from the IOO-year flood by dike, levee, or other water-control structure; areas subject to certain types of IOO-year shallow flooding where depths are less than 1.0 foot; or, areas subject to IOO-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 each flooding source studied in detail in the community are summarized in Table 3. 5.4 Flood Insurance Rate Map Description The Flood Insurance Rate Map for the City of Lafayette is, for insurance purposes, the principal result of the Flood Insurance Study. This map (published separately) contains the official deline- ation 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 (lOa-year) flood. This map is developed in accordance with the latest flood insurance map prepara- tion guidelines published by the Federal Insurance Administration. 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. 13