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<br />6.0 GREEN RIVER BASIN <br /> <br />DRAFT <br /> <br />DRAFT <br /> <br />DRAFT <br /> <br />Hydrology data from detailed floodplain analyses were obtained and analyzed for the Green River <br />basin, The Green River basin was not divided into subregions. A description of the Green River <br />region along with the associated regression equation and application criteria are presented below. <br />Figure 1.0, which graphically presents the regional and subregional boundaries for the state, is <br />located in the map pocket at the end of this report. <br /> <br />GRN-I: GREEN RIVER SUBREGION <br /> <br />This subregion includes the Green River mainstem and its tributaries in northwestern Colorado. <br />Streams in this subregion are located in Routt County, Moffat County, and Rio Blanco County. <br />Major tributaries in this subregion include the Yampa River basin, Elk River basin, and White <br />River basin. The subregion is bounded as follows: <br /> <br />. On the north by the Colorado - Wyoming state line; <br />. On the east by the Green River - North Platte River basin divide; <br />. On the south by the Green River - Colorado River basin divide; and <br />. On the west by the Colorado - Utah state line, <br /> <br />The regression equation for this subregion is only valid for natural tributary streams that have <br />drainage areas between 1 mi2 and 3,300 mi2. A detailed study or other hydrologic analysis must <br />be performed for projects involving streams with drainage areas that fall outside of the applicable <br />range. <br /> <br />The equation for subregion GRN-l is: <br /> <br />Q = 470.9(A).417 <br /> <br />Where: <br />A = Drainage Area, square miles (1 <A<3,300) <br />Q = 100 year peak flow, cfs <br /> <br />Sub- Sub- #of R Squared Std <br />region region Regression Data Min. Max. (Regression Error of <br />Name Description Equation Points D.A. D.A. Correlation) Estimate <br />GRN-l Green River Q = 470,9(A)417 40 1 3300 .873 36% <br /> Basin <br /> <br />27 <br />