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<br />Based on a drainage area of 1550 square miles at Uravan, the MSM <br />flood frequency curves yield flows in the San Miguel River as <br />follows: <br /> <br />FREQUENCY, YRS <br />10 <br />50 <br />100 <br />500 <br /> <br />EEAK FLOW, CFS <br />7,700 <br />11 ,700 <br />13,500 <br />18,700 <br /> <br />Due to the proximity of the Club Ranch Ponds to Atkinson Creek, the <br />study area of this report analyzed the river reach from 2,200 feet <br />downstream of the confluence of Atkinson Creek with the San Miguel <br />to 2,300 feet upstream of the confluence of Hieroglyphic Canyon <br />with the San Miguel. Because of this, the additional 34 square mile <br />drainage area of Atkinson Creek, not included in the MSM study, was <br />considered. The MSM flood frequency curves yielded peak flows for <br />Atkinson Creek as follows: <br /> <br />FREQUENCY, YRS <br />10 <br />50 <br />100 <br />500 <br /> <br />PEAK FLOI" CFS <br />880 <br />1,230 <br />1,430 <br />2,000 <br /> <br />These values were verified for reasonableness by checking the~ <br />against the peak flows calculated by the methods outlined in the <br />Colorado Water Conservation Board's Technical f'lanual No.1: "Manual <br />for Estimating Flood Characteristics of Natural-Flow Streams in <br />Colorado". The values predicted by this publication averaged 13 <br />percent lower than the MSM curve values. Due to the regional <br />nature of the MSM study based on local data, and to assure conserva- <br />tive results, the MSM values were used as inputs to the computer <br />model employed in this study. <br /> <br />B <br />