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<br />I <br />I. <br />1 <br />I <br />I <br />.-: <br />I <br />I <br />I <br />I: <br />I <br /> <br /> <br />, <br /> <br />I <br />IP, <br />. ' <br /> <br /> <br />I <br /> <br />I <br />I. <br />I,' <br />I <br />I~ : <br />, . <br />l <br /> <br /> <br />, <br /> <br />I~,~ <br /> <br />IV. Hydrologic Analysis <br /> <br />A. Colorado River <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 gauges used in the hydrologic <br />analysis. <br /> <br />Gauqe <br /> <br />Drainaqe Area <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 />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 />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 guidelines 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 />