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<br />Army Corps of Engineers considers the study to be outdated. High <br />water marks of the 1973 flood on the South Platte River supplied by <br />the Colorado Water Conservation Board (Reference 9) were considered <br />and thoroughly compared with the 100-year flood profile. The 100-year <br />profile reported herein is within 0.5 foot of the 1973 high water <br />elevations except at some bridges where the 1973 flood profile was up <br />to 1.5 feet higher. This difference was attributed to the bridge <br />structure blockage, which is not considered in the Flood Insurance <br />Study analysis. <br /> <br />The present official floodplain study for Sand Creek is in Volume II <br />of the study for Sand, Toll Gate, and Lower Cherry Creeks, South <br />Platte River Basin (Reference 10) which was designated by the Colorado <br />Water Conservation Board on March 8, 1972. A revised and updated <br />version of this study (Reference 11) was completed by the U.S. Army <br />Corps of Engineers and the Urban Drainage and Flood Control District <br />in March 1977 and in the next few months. is expected to be approved as <br />the official floodplain study. This Flood Insurance Study was based <br />on the.-new-data developed-by-.theU .S.Army-{;<>rps of Eng.iflee.r-s-~().r the <br />Urban Drainage and Flood Control District; therefore, the studies are <br />in agreement. <br /> <br />A Flood Insurance Study for Adams County was prepared by Gingery <br />Associates for the Federal Insurance Administration (Reference 5). <br />The maps agree exactly between the two studies. There is a slight <br />disagreement concerning distances between physical features between <br />the profiles of the two studies because the centerline of the South <br />Platte River was measured using two different maps. However, cross <br />section locations and elevations agree. <br /> <br />This study is authoritative for purposes of <br />Program; the data supersede or are compatible <br />published flood information for Commerce City. <br /> <br />the Flood <br />wi th all <br /> <br />Insurance <br />previously <br /> <br />7.0 LOCATION OF DATA <br /> <br />Survey, hydrologic, hydraulic, and other pertinent data used in this <br />study can be obtained by contacting the office of Insurance and <br />Mitigation Division, Federal Emergency Management Agency, Denver <br />Federal Center, Building 710, P.O. Box 25267, Denver, Colorado 80225. <br /> <br />8.0 BIBLIOGRAPHY AND REFERENCES <br /> <br />1. Department of Environmental Engineering Sciences, University of <br />Florida, Gainesville, Florida, Storm Water Management Model <br />User's Manual Version II, Wayne C. Huber, James P. Heanery, <br />Miguel A. Medina, W. Alan Peltz, Hasan Sheikh, and George F. <br />Smith, March 1975 <br /> <br />2. <br /> <br />U.S. N..tiohal Weather <br />Adm~n~strat~on, ~ce <br />PreciDitation FreQuency <br /> <br /> <br />ranc , <br /> <br />20 <br />