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Flood Insurance Study Report Data Flood Insurance Study - Florence, Colorado Page 2 2.0 AREA OF STUDY 2.1 ScopeoU~ This Flood Insurance Study covers Oak Creek within the City of Florence, Colorado. A lOO-year floodplain and flood way analysis was perfoffiled. 2.2 Community Description Location in State: The City of Florence is located in south central Colorado approximately 30 miks west of the City of Pueblo. 2.3 Principle Flood Problems Oak Creek has been chaanelized aad straightened through the City of Florence:. Through much of the study reach, the Oak Creek channel is no longer located in the: bottom of th(~ historic Oak Creek Valley. In some locations, the banks of the existing channel have been filled. These factors, combined with relatively small bridge openings aad a railroad embankment cause the floodplain to be broad with hyclraulically divided flows in both the rlght and left overbaaks. 2.4 Flood Protection Measures None. 3.0 ENGINEERING METHODS 3. 1 Hydrologic Analyses A hydrologic aa~Jysis of the Oak Creek basin was undertaken by the Albuquerque District of the USACE specifically for this re-aaalysis of the Oak Creek floodplain. The complete USACE report along with aa acceptance letter of the hydrology from the State of Colorado Water Conservation Board Flood Control and Floodplain Maaagement Section is included in the correspondence in the Appendix. The peak flood discharges determined by the USACE are presented in Table 1. TABLE 1 Flood Discharges . Oak Creek at Florence, Colorado Frequency lO-year 25-year SO-year 100- year SOD-year E~ak Discharlie (cfs) 7,100 cfs 10,400 cfs 13,300 cfs 16,000 cfs 23,000 cfs 3.2 Hydraulic Analyses Cross Sections: HEX-2 cross sections for Oak Creek were taken from 1" = 100' maps with 2-foo'l contour intervals provided by the City (Reference 1).