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<br />efficiently transport this runoff and pollutants to nearby receiving <br />waters <br /> <br />Rainfall Distribution Analysis <br /> <br /> <br />Prior to applying models and data from the DRURP to predict annual loads <br /> <br /> <br />and runoff by land use type. an annual distribution of storm events by <br /> <br /> <br />storm size had to be derived. Models from DRURP use rainfall as one of <br /> <br /> <br />the inputs to predict loads of runoff. Not only is data needed <br /> <br /> <br />pertaining to the size of storms expected during any given year, but also <br /> <br /> <br />on how many storms of any size will occur per year. <br /> <br /> <br />Annual storm size distribution was developed for Bear Creek Basin using <br /> <br /> <br />daily precipitation records from two stations, the Evergreen station and <br /> <br /> <br />the Morrison 1 SW station. Information on these two stations was <br /> <br /> <br />supplied by the Colorado Climate Center at Colorado State University. <br /> <br /> <br />The number of storms of a specified storm size interval occurring per <br /> <br /> <br />year at each station was determined. The two raingages were used as <br /> <br /> <br />there is a significant difference of rainfall over the basin due mainly <br /> <br /> <br />to elevation and topographic differences. The data from the Morrison 1 <br /> <br /> <br />SW gage was applied to only the Direct Flow 1 and Rooney Gulch <br /> <br /> <br />sub-basins. The Evergreen raingage data was applied to all other <br /> <br /> <br />sub-basins. <br /> <br /> <br />Specific rainfall intervals were delineated based upon the range of storm <br /> <br /> <br />sizes and requi rements of the DRU RP models. The distribution of storms <br /> <br /> <br />within the basin (rainfall event frequency) for the two raingages is <br /> <br /> <br />displayed in Tables 3 and 4. <br /> <br />62 <br />