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<br />Zones Al and A3: <br /> <br />Special Flood Hazard Areas inundated by <br />the IOO-year flood, determined by <br />detailed methods; base flood elevations <br />shown, and zones subdivided according <br />to Flood Hazard Factors. <br /> <br />Zone B: <br /> <br />Areas between the Special Flood Hazard <br />Areas and the limits of the SOO-year <br />flood, including areas of the SOQ-year <br />flood plain that are protected from the <br />IOO-year flood by dike, levee, or other <br />water control structure; also areas <br />subject to certain types of IOO-year <br />shallow flooding where depths are less <br />than 1.0 foot; and areas subject to <br />IOO-year flooding from sources with <br />drainage areas less than 1 square mile. <br />Zone B is not subdivided. <br /> <br />Zone c: <br /> <br />Areas of minimal flooding. <br /> <br />The flood elevation differences, Flood Hazard Factors, flood insur- <br />ance zones, and base flood elevations for each flooding source <br />studied in detail in the community are summarized in Table 3. <br /> <br />5.4 Flood Insurance Rate Map Description <br /> <br />The Flood Insurance Rate Map for the Town of Frederick is, for <br />insurance purposes, the principal result of the Flood Insurance <br />Study. This map contains the official delineation of flood insurance <br />zones and base flood elevation lines. Base flood elevation lines <br />show the locations of the expected whole-foot water-surface eleva- <br />tions of the base (lOa-year) flood. This map is developed in <br />accordance with the latest flood insurance map preparation guide- <br />lines published by the Federal Eflergency Management Agency. <br /> <br />6.0 OTHER STUDIES <br /> <br />No other flood plain delineation studies have been made for the Town of <br />Frederick. However, a drainage study was completed for the community by <br />Nelson, Haley, Patterson and Quirk, Inc. (Reference 12), and a preliminary <br />report on flood control is currently being prepared by the U.S. Army <br />Corps of Engineers, Omaha District. <br /> <br />The lOa-year discharges computed for this study are higher than the <br />values obtained in either of the above reports because failure of the <br />Frederick levee was not considered in the other reports. The Nelson, <br />Haley, Patterson and Quirk, Inc./ and U.s. Army Corps of Engineers reports <br />only reflect overtopping of the levee, thus the discharges are lower. <br /> <br />10 <br />