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<br />17. U.S. Army Corps of Engineers, Albuquerque District, Hydroloqy for <br />Oak Creek, Florence, Colorado, December 1991. <br /> <br />18. U.S. Department of the Army, Corps of Engineers, Hydrologic <br />Engineering Center, HEC-RAS River Analysis System, Generalized <br />Computer Proqram, Version 2.2, Davis, California, September 1998. <br /> <br />19. <br /> <br />Chow, V.T., Open-Channel <br />Engineering Series, 1959. <br /> <br />Hydraulics, <br /> <br />McGraw-Hill <br /> <br />Civil <br /> <br />20. <br /> <br />Nelson, Haley, Patterson <br />and Flood Study for <br />Scale: 1" = 100', contour <br /> <br />& Quirk, <br />Florence, <br />interval = <br /> <br />Inc. , Comprehensive Drainaqe <br />Colorado, February 1977, <br />2 feet. <br /> <br />10.0 REVISION DESCRIPTIONS <br /> <br />This section has been added to provide information regarding <br />significant revisions made since the original Flood Insurance Study was <br />printed. Future revisions may be made that do not result in the <br />republishing of the Flood Insurance Study report. To assure that any <br />user is aware of all revisions, it is advisable to contact the <br />communi ty repository of flood-hazard data located at Fremont County <br />Office, 300 West Main, Florence, CO 81226. <br /> <br />10.1 First Revision <br /> <br />This study was revised on March 17, 2002, to incorporate a <br />hydraulic analysis of Oak Creek (including its right & left bank <br />overflows) from its confluence with the Arkansas River to the <br />abandoned Atchison, Topeka & Santa Fe Railroad. The hydraulic <br />analysis for this revision was performed by the Albuquerque <br />District of the U. S. Army Corps of Engineers, for the Federal <br />Emergency Management Agency under Interagency Agreement <br />No. EMW-98-IA-0176, Project Order No.9. The work was completed <br />in October 1999. <br /> <br />Discharges were taken from the 1991 hydrologic analysis of the <br />Oak Creek basin prepared by the Albuquerque District of the U.S. <br />Army Corps of Engineers (Reference 17). <br /> <br />The hydraulic characteristics of the flooding sources were <br />analyzed to provide flood plains for the 1- and <br />O.2-percent-chance floods and estimates of the water surface <br />elevations for the 10-, 2-, 1-, and O. 2-percent-chance floods <br />along the flow paths studied in detail. The water surface <br />elevations were computed using the computer program HEC-RAS <br />(Hydraulic Engineering Center-River Analysis System), developed <br />by the u.S. Army Corps of Engineers Hydrologic Engineering Center <br />(Reference 18), and based on cross-sectional data generated from <br />field surveyed data and mapping provided by the City of Florence. <br />Structures that affect the hydraulic computations were field <br />checked to obtain pertinent dimensions. The flood profiles show <br />the locations of cross sections used in the hydraulic analysis <br />and the computed water surface elevations. The hydraulic <br />analyses for this revision were based on unobstructed flow. The <br />flood elevations shown on the profiles are thus considered valid <br /> <br />13 <br />