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<br />IV. Hydrologic Analysis <br /> <br />A. Colorado Rive): <br /> <br />1. Stream Gauges <br /> <br />There are several USGS streamflow gauging stations on the <br />Colorado River and tributaries in the project area. The <br />following is a list of the gaugE!S used in the hydrologic <br />analysis. <br /> <br />Gauqe <br /> <br />Drainaqe AI~ea <br />(sq.mi. ) <br /> <br />8.050 <br /> <br />Period of Record <br /> <br />09095500 Colorado River <br />nr. Cameo <br /> <br />1934-1985 <br /> <br />09105000 Plateau Creek <br />nr. Cameo <br /> <br />592 <br /> <br />1936-1985 <br /> <br />r <br /> <br />09106000 Colorado River <br />nr. palisade <br /> <br />8,738 <br /> <br />1902-1933 <br /> <br />09152500 Gunnison River <br />nr. Grand Junction <br /> <br />7,928 <br /> <br />1897-1985 <br /> <br />09153000 Colorado River <br />nr. Fruita <br /> <br />17,100 <br /> <br />1911-1923 <br /> <br />09163500 Colorado River <br />nr. Colorado-Utah <br />State Line <br /> <br />17,843 <br /> <br />1951-1985 <br /> <br />The gauge locations are shown on Figure 1. <br /> <br />, . <br /> <br />2. Peak DischargE! Estimation <br /> <br />Flood frequency analyses were performed using the log Pearson <br />Type III method, in accordance with "Guidelines for Determining <br />Flood Flow Frequency", Bulletin l7B (10). The, series that were <br />analyzed represent primarily snowmelt floods which peak between <br />late April and June. Following the 9uideline:3 of the Corps of <br />Engineers, a regional skew of zero was used for the Cameo gauge <br />(8). ThE~ Appendix includes the results of the frequency <br />analyses. The "Hydrodata" system, developed by US West Optical <br />Publishing, and the companion program for flood frequency <br />analysis, "fffreak", were used in the analysis. <br /> <br />-4- <br /> <br />. . <br />