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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />IV. DESCRIPTION OF PREVIOUS STUDIES <br /> <br />The Breckenridge Floodplain Information Report (Ref. 1), completed in 1975, <br /> <br />derived frequency - discharge relationships for certain tributaries within the <br /> <br />Town of Breckenri dge. Synthet i c storms were deri ved from the statist i ca 1 <br /> <br />analysis of rainfall data as presented in Technical Paper 40 of the U.S. <br /> <br />Department of Commerce, Weather Service. The peak flow rate data for French <br /> <br />Gulch and the Blue River (downstream of Goose Pasture Tarn) are contained in the <br /> <br />1975 report and provide peak flow rates for the 10-, 100-, and 500-year <br /> <br />recurrence intervals. <br /> <br />The Hydrology Report for the Summit County Flood Insurance Studies completed in <br />1978 (Ref. 2) contained the discharge-frequency data that is tabulated in the <br />published FIS. Stream gage data for a particular study reach was statistically <br />analyzed to compute peak flow rates for specific recurrence intervals. This was <br />done for the Snake River using data from Gage No. 475 and for Tenmile Creek using <br />data from Gage No. 501. Adjustments for locations other than at the gage station <br />were made by making a discharge versus drainage area comparison. <br /> <br />A regional regression analysis was performed to provide a basis for estimating <br /> <br />flows from ungaged dra i nage bas i ns havi ng s imil ar characteri st i cs of gaged <br /> <br />drainage basins. A single variable (drainage area) algorithm was developed from <br /> <br />the regress i on anal ys is for each selected flood frequency. These algorithms were <br /> <br />converted into a graphical depiction (Ref. 2, Fig. 2) of drainage area versus <br /> <br />peak flow rate wi th each 1 i ne represent i ng all val ues of the same frequency <br /> <br /> <br />event. <br /> <br />5 <br />