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<br />Major Drainage Master plan, Big Dry Creek, completed by VTN Colorado, <br />Inc4 in June 1975. shows the 100-year flood plain boundary and water- <br />surface profile (Reference 37). This study was also prepared for UOFCD. <br /> <br />A COE Flood plain Information report on Cherry Creek (Reference 14) <br />prepared for UDFCD includes determinations of 10-, 50-, 100-1 and 500- <br />year flood discharges and water-surface profiles. This FIS included <br />verification of the COE hydrologic and hydraulic analysis. One area of <br />disagreement was noted. At the confluence of Happy Canyon and Cherry <br />Creeks, a significant difference in existing terrain was observed when a <br />comparison of the mapping was made. The stream channel was relocated <br />subsequent to the COE mapping when a change in land use occurred. This <br />FrS is based on more recent conditions and utilizes COE data to show <br />flood plain limits in this area. <br /> <br />Howard, Needles, Tammen & Bergendoff completed a report (Reference 16) <br />in November 1977 for UDFCD. The 10-, 50-, 100-, and 500-year flood dis- <br />charges were calculated for future flood conditions and the 100-year <br />profile and flood plain boundaries are shown. <br /> <br />The Jack G. Raub Company completed Flood Hazard Area Delineations <br />reports for Dad Clark Gulch in May 1981 and for Marcy Gulch in February <br />1983 (References 19 and 20, respectively). The 100-year flood plain <br />boundaries and profiles are shown. This FIS includes these streams, but <br />is based on the present condition of the study area. The study results <br />are necessarily different. <br /> <br />USGS Flood-Prone Area Maps for Douglas County (Reference 38) were used <br />for general information and reference purposes. These maps, however, <br />reflect approximate flood hazard area boundaries and are superseded by <br />this FIS. <br /> <br />Because the information used to revise this FIS was the same information <br />used to revise that report, this FIS is in agreement with the Type 19 <br />FIS for the Town of Castle Rock (Reference 39). <br /> <br />8.0 LOCATION OF DATA <br /> <br />Information concerning the pertinent data used in the preparation of <br />this study can be obtained by contacting FEMA, Mitigation Division, <br />Denver Federal Center, Building 710, Box 25267. Denver, Colorado 80225- <br />0267. <br /> <br />55 <br />