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<br />.1 <br />I <br />(I <br />I: I <br />I <br />'i I <br />, I <br />Ii I <br />II <br />. , <br /> <br />through each sub-basin are less than the computation increment. <br /> <br />In this manner, hydrographs are properly lagged through the <br />study reach. <br /> <br />Input Data <br /> <br />Rainfall information for this study was taken from the NOAA <br /> <br />Atlas, Volume II, Colorado (Reference 7). The 500-year rainfall, <br /> <br />il <br /> <br />not available from the Atlas, was extrapolated assuming a Gumbel <br /> <br />distribution. The total rainfall depths for each frequency for <br /> <br />I <br />I <br />'II <br />Ii I <br />\ <br />II <br />,I <br />II <br />II <br />II <br />II <br />I <br />I <br /> <br />a one-hour duration storm were adjusted by an areal reduction <br />factor, and these adjusted values are shown in Table III. <br /> <br />The one-hour duration cloudburst event was assumed to be the <br /> <br />typical storm-producing flood peaks along the front range of <br /> <br />Colorado. <br /> <br />Table III. Rainfall Depths for One-Hour Duration Storm <br /> <br />Frequency Depth <br />2-Year 0.62" <br />5-Year 0.90" <br />10-Year 1.10" <br />50-Year 1.60" <br />100-Year 1.89" <br />500-Year 2.72" <br /> <br />;:'/"":::;'li <br />:t<~~- <br />