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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />5.5.3 Results for Reach 6 <br /> <br />Before any analysis was completed, the data record for both the Gunnison River at Almont and East <br />River at A1mont gages were filtered for rain on snow events, using the 0.5 inch criteria discussed in <br />Section 4.1.1. Four rain on snow events were found in the record of the Gunnison River at Almont. The <br />East River at A1mont results are described in Section 5.4. <br /> <br />The REGFREO and HEC-FFA programs were used to perform the analysis on the flow record in <br />Appendix A - Table A.5. Prior to using the REGFREO program, HEC-FFA was used on both the East <br />River at A1mont and Gunnison River at A1mont data to test for low and high outliers based on a <br />methodology described in Bulletin 178. Any outliers were manually removed from the REGFREO data <br />set. The 1977 flow for the both the Gunnison and East River at A1mont data sets were determined to be <br />low outliers. The results from the analysis are presented in Figure 5.5.3.1. Additionally, the adopted <br />statistics and the 10, 2, 1, and 0.2 percent chance exceedence flows are presented in Table 5.5.3.1. <br /> <br />Table 5.5.3.1 Flood Frequency Analysis Results for Reach 6 - Gunnison River from Almont to <br />Ohio Creek <br /> <br /> Std. Flow (cfs) <br /> Mean Dev. Skew Chance Exceedence <br /> 1 0% 2% 1% 0.2% <br />Peak 3.613 0.140 0.000 6,200 7,953 8,683 10,374 <br />1-Day 3.567 0.140 0.000 5,577 7,154 7,811 9,331 <br />3-Day 3.550 0.140 0.000 5,363 6,879 7,511 8,973 <br />5-Dav 3.536 0.140 0.000 5,193 6,661 7,273 8,688 <br />7-Day 3.524 0.140 0.000 5,051 6,479 7,074 8,452 <br />15-Day 3.477 0.150 0.000 4,669 6,096 6,698 8,104 <br />3D-Day 3.423 0.150 0.000 4,123 5,383 5,915 7,157 <br />60-Day 3.334 0.150 -0.100 3,346 4,305 4,698 5,592 <br /> <br />28 <br />