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• period of record of five years. In addition, the gage is listed <br />as being materially affected by diversions and regulation. Gage <br />No. 2991, "Fish Creek near Milner, Colorado" is located about 12 <br />miles north of the study area and has a drainage area of about <br />34.5 square miles. This gage has a listed period of record of <br />eight years. In addition, a gage was placed and maintained by <br />Colorado State University.during 1974 and 1975 as apart of a <br />master's thesis study. This gage, however, only adds two years <br />to the available records. As a result, it is 'not felt that there <br />is sufficient data available to complete a satisfactory Log-Pearson <br />Type III or other statistical analysis. <br />The procedure outlined in "Procedures for Determining Peak <br />Flows in Colorado" published by the Soil Conservation Service, <br />• U.S. Dept. of Agriculture in December 1972 was investigated but <br />was felt to be unreliable for this analysis. The procedure is <br />primarily directed at rainfall derived runoff events. The Trout <br />Creek basin under study has a mean elevation of approximately 9500 <br />feet. It is generally conceded that runoff events from basins <br />above elevations of 7500 to 8000 feet primarily result from snow- <br />melt occurrences rather than rainfall. In addition, the size of <br />the basin and the variability of conditions affecting runoff within <br />~ the basin make accurate selection of key parameters very difficult. <br />The D.S. Geological Survey has published in "Magnitude and <br />Frequency of Floods in Colorado, Part 9" a procedure for determining <br />the magnitude of runoff events at ungaged locations. From the infor- <br />oration available for the Trout Creek drainage basin, this method <br />~ ~ appears to be the most:appropriate. It is reliable through,tbe. ~~•- <br />.~ <br />I _ ._ ~ -_ -~- _ __ i3s <br />