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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 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 flood hazard; not sub- divided. Zone D: Areas of undetermined, but possible flood hazard. 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 5. 5.4 Flood Insurance Rate Map Description The Flood Insurance Rate Map for the Town of winter Park is, for insurance purposes, the principal product of the Flood Insurance Study. This maP contains the official delineation of flood insur- ance zones and base flood elevations. Base flood elevation lines show the locations of the expected whole-foot water-surface eleva- tion of the base (lOO-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 Worrall Engineering published a 1983 Flood Plain Information and Drainage Study (Reference 1). Hydrologic data developed by Worrall Engineering were used in this study. Cross section data from the Worrall study were also used for portions of the Fraser River. The flood profiles generated by this study have been checked against results of the WOrrall study. Differences in computed water-surface elevations are less than 0.5 foot except where structures have been modified, obvious errors were made, or different hydraulic computations were used. In the Worrall study, pressure or weir flow was treated using Federal Highway Administration techniques, whereas in the current study the special bridge routine of HEC-2 was utilized. study results were compared in the vicinity of Beaver village to the report completed by the developer's engineer (Reference 6). Computed water-surface elevations agreed to within 0.5 foot. The current study 29