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<br />Table 8 <br />Peak Flow Values, Hydrology Report, FIS <br />Eagle County, Colorado <br />August 9, 1978 <br />Gingery Associates, Inc. <br />Prepared for US Department of Housing and Urban Development <br />Federal Insurance Administration <br />(Determined by Areal adjustment) <br /> <br />Flooding Source Drainage Area Peak Discharge, CFS <br />And Location Square Miles 10-Year 50-Year 100-Year 500-Year <br />Eagle River at <br />GVDsum 844 --- --- 8200 --- <br />Eagle River at <br />Eaale 650 --- --- 6800 --- <br />Eagle River at <br />Edwards 496 --- --- 5600 --- <br />Eagle River at <br />Minturn 265 --- --- 2900 --- <br /> <br />STUDY RESULTS <br /> <br />Peak flows were calculated for each gauging station within the study reach on the main <br />stem of the Eagle River, and on pertinent tributaries. A total of 14 gages were analyzed. <br />Table 9 shows the gage name, USGS station number, total drainage basin area, <br />tributary area above 10,000 feet elevation, calculated peak flows for the 10, 50, 100, and <br />500 year events, and a comparison of runoff per square mile for the full watershed and <br />the area above 10,000 feet elevation. Gages are sequentially numbered by location as <br />shown on Figure 1. <br /> <br />Initial results indicated an anomaly in existing data for the Eagle River at Eagle gage. <br />This gage was in service for 14 years, from 1911 to 1924. The Log Pearson Type III <br />analysis of peak flows showed the 1 OO-year event at this gage to be approximately 350 <br />cfs higher than the 100 year flood event at the Eagle River below Gypsum gage. The <br />Eagle River below Gypsum is seven miles downstream, has a much longer period of <br />record (57 years) and also includes additional runoff received from Brush Creek and <br />Gypsum Creek. <br /> <br />9 <br /> <br />~ <br /> <br />I Water Resource Consultants, LLC <br />.....l <br />