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<br />HYDROLOGIC AND HYDRAULIC DETERMINATIONS <br /> <br />Hydrologic Analysis <br /> <br />Flood Ch9.X'acieristics <br /> <br />Flood frequency curves "ere prepared for Holyoke at U.S. Highva.;.' 38~. <br /> <br />Flood flovs in this a.rea of Colorado generally :result horn high inten_ <br /> <br />Several methods vere investigated to obtain the best possible comparison <br /> <br />sity, short duration, cloudburst type thunderstorms. Frenchman Creek has <br /> <br />for freQ.uency cUI'Ve selection. These _thods include Btree.>nrlov data from <br /> <br />experiencedveryfevofthesetypesofthunderstormsvhileadjacentbas1ns <br /> <br />the Wray, Colorado, report, three separate sets of regression equations <br /> <br />storma occur trom late spring to late B~r. Due to the nature of these <br /> <br />(Reference 4, 5, 6), and a synthetic computer modeling technique (Refer- <br />ence7). <br /> <br />he.veex,periencedextremelyintensethundersto:rlll8. Mostotthesethunder- <br /> <br />h1gb.ly localized stonns, the runoff is characteri:ed by a quick buildup <br /> <br />to a peak and then ataperin" Off. <br /> <br />The hydrologic analysis vaS carried out to establish the peak dis- <br /> <br />charge-frequency rell!.tionships for noods of 10-,50-,100-, and 500-year <br /> <br />recurrence intervals for the North Fork Republican River (Reference 8). <br /> <br />The analysis used in this report is referred to in the Technical Addendum <br /> <br />as the Upper Republican River BeBin Hegional Frequency Study (Reference 9). <br /> <br />This techni~ue is based On statistical analyses of the streamflov records <br /> <br />of several drainage basins in the .&me eeographical region aa the North <br /> <br />FcrkRepublicanRiverbasin. For a detalleddeseription of the hydrologic <br /> <br />, <br />i <br /> <br />analysis, refer to the Technical Addendum. Peak dischl!.rges for FrenChman <br /> <br />Creek are shown in Table 3 On page 14. <br /> <br />n <br /> <br />12 <br />