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<br />. <br /> <br />. <br /> <br />. <br /> <br />Table 4.4 Effective and Duplicate COFC Model Names. <br /> <br />j <br /> <br />Effective Model Name <br /> <br />Duplicate Effective Models <br />DETFW06 <br /> <br />RCUPTF05 <br /> <br />The City of Fort Collins currently administers a tenth-foot rise floodway criterion on the <br />Cache la Poudre River. Thus, the tenth-foot rise floodway analysis was replicat(~d for the <br />duplicate effective analysis. The same starting water surface elevation and roughness <br />coefficients utilized in the effective analysis were also utilized in the duplicate effectivle analysis. <br />Table 4.5 presents a summary of the effective and duplicate tenth-foot rise floodway results for <br />the study reach. <br />Within the study reach, results of the duplicate effective tenth-foot rise floodway analysis <br />matched the results published in the 2000 Ayres, Inc. study and 2005 Removal Action LOMR <br />study. <br />It is noted that surcharges in excess of 0.1 feet exist within the current study reach at <br />Cross Sections AQ:226167, AR:227397, 227437, and AS:228117. The surcharges in excess of <br />0.1 feet were present during the original 2000 Ayers, Inc. analysis and were accepted by the City <br />of Fort Collins as shown in Appendix B.IA. <br />As a result of the close comparison with the effective floodway data it was concluded that <br />the tenth-foot rise floodway model used as the basis for the current study, is c:apable of <br />reproducing the results published in the 2000 Ayres, Inc. study and the 2005 Removal Action <br />LOMR. The input/output HEC-2 reports for the duplicate effective floodway model are <br />provided in Appendix G. A digital copy of the HEC-2 models utilized for the current study is <br />provided on the disk included with this report. <br /> <br />eOFC2003-l0 Oxbow FINAL LOMR.doc <br /> <br />4.8 <br /> <br />ANdERSON CONsulTiNG ENGiNEERS, INC. <br />