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<br />County. The locations of both Igage sites are shown in Figure <br />1. <br /> <br />The gage in sterling, located 29 miles upstream from <br />Crook, will provide most of the :Elood warning data. The gage <br />in Crook will be used mainly t,O determine when the river is <br />approaching critical threshold elevations that will cause <br />flooding problems in the Crook ar.~a.. <br /> <br />2. REQUESTED HYDRAULIC PRODUCTS <br />This section contains the :IDaterial requested in the ewCB <br />document "State of ColoradCl Corps Secti.clIl 22 Planning Program, <br />Plan-of-Work". A copy Clf this document is contained in <br />Appendix B. <br /> <br />2.1 Rating CUrves <br />Rating curves were dE!velopE!d for both gage sites using <br />cross section data provided by th.! ewCB and the U. S.. Army Corps <br />of Engineers HEC-2 model. They were prepared for cross <br />sections located downstream of beJth bridges at the gage sites <br />and other important sites. The :ra.ting curve for the upstream <br />flood warning gagE: site at the High.way Ei bridge at Sterling is <br />shown in Figure 2, and the! rating curve for the downstream <br />gage site at the Highway 5S bricllge at Crook is shown in Figure <br />3. <br /> <br />2.2 Travel Times <br />2.2.1 Discussion of Travel Times and Flood Warning Times <br />Travel times for the reach from sterling to Crook were <br />prepared using thE' HEC-2 mc)del and surveyed cross-sections for <br />the Sterling and Crook areas as well as a simplified <br />representative crc,ss-section for the entire south Platte River <br />reach. The travel times were computed for a constant discharge <br />and are not the same as flood ~rarning times. Flood warning <br />time includes hydrograph behavior on the South Platte River, at <br />both sites, as well as t.ravel time!. <br /> <br />:I <br />