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<br />o <br />a <br />" <br />"', <br />..... <br />o <br /> <br />.r',? <br /> <br />;. ~J <br /> <br />/.,,' <br /> <br />, <br /> <br />and study findings. State-of-the-art hydrology study methods <br />w~re used in completing the hydrologic analysis. The study <br />methods considered included: <br /> <br />1. Log-Pearson Type III Frequency Distribution, <br />Water Resources Council Bulletin No. 17 <br />(Ref. 5) <br /> <br />2. "Manual for Estimating Flood Characteristics <br />of Natural-Flow Streams in Colorado", Technical <br />Manual No.1, u. S. Geological Survey and Colorado <br />Water Conservation Boarq (Ref. 6) <br /> <br />3. Storm Water Management Model, Environmental <br />Protection Agency (Ref. 7) <br /> <br />The Log-Pearson Type III frequency distribution served as <br />the primary basis for estimating the flood discharge-frequency. <br />The other two methods served as a means of checking the study <br />results. The Log-Pearson Type III method relies on the historic <br />stream flow records at various gages on the river. The stream <br />gages on the Big Thompson River considered in the stUdy are <br />listed below: <br /> <br />Period of Years of <br />Re'cord Record Gage Name <br /> Big Thompson Rive;r, <br />1888-1976 49 at mouth of Canyon <br /> Big Thompson River, <br />1918-1955 38 below'Powerhouse <br /> North Fork Big Thompson River, <br />,1947-1976 30 at Drake <br /> Big Thompson River, <br />1947-1976 30 near Estes Park <br /> Big Thompson River, <br />1930-1976 48 at Estes Park <br /> <br />-11- <br />