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<br />.hallow flooding wner€ depths are less <br />than 1.0 foot; and areas subject to <br />lOO-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 Fort Lupton is, for <br />insurance purposes, the principal result of the Flood Insurance <br />Study. This map (published separately) contains the official <br />delineation of flood insurance zones and base flood elevation lines. <br />Base flood elevation~lines show the locations of the expected whole- <br />foot water-surface elevations of the base (lOO-year) flood. This <br />map is developed in accordance with the latest flood insurance map <br />preparation guidelines published by the Federal Insurance Adminis- <br />tration. <br /> <br />6.0 OTHER STUDIES <br /> <br />The U.S. Army Corps of Engineers published a Special Flood Hazard Informa- <br />tion report on the South Platte River in Weld County (Reference 5). The <br />discharges used in this Flood Insurance Study were supplied by the U.S. <br />Army Corps of Engineers, and the flood elevations were checked to assure <br />agreement. All elevations in this study are in general agreement with <br />the U.S. Army Corps of Engineers report, with the exception of one cross <br />section downstream of State Highway 52. The elevation presented in this <br />report is 0.9 foot higher, in response to a more detailed division of <br />Manning's "n" values. The u.s.. Army Corps of Engineers used a general <br />overbank value of 0.06, and the overbank values in this study ranged from <br />0.045 to 0.120. There are no other studies on the South Platte River in <br />the vicinity of Fort Lupton. <br /> <br />This study is in agreement with the Federal Insurance Administration's <br />Flood Hazard Boundary Maps (Reference 9). <br /> <br />This study is authoritative for the purposes of the National Flood Insur- <br />ance Program; data presented herein either supersede or are compatible <br />with all preV10US determinations. <br /> <br />11 <br />