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<br />4.0 REPUBLICAN RIVER BASIN <br /> <br />Hydrology data from detailed floodplain analyses were obtained and analyzed for the Republican <br />River basin. The Republican River basin was not divided into subregions as was the case for the <br />Arkansas and the South Platte basins. A description of the single region along with the associated <br />regression equation and application criteria are presented below, Figure 1.0, which graphically <br />presents the regional and subregional boundaries for the state, is located in the map pocket at the <br />end of this report. <br /> <br />REP-l: REPUBLICAN RIVER BASIN <br /> <br />Thissubregion includes stream reaches in the plains area of eastern Colorado including areas within <br />portions of Phillips County, Logan County, Washington County, Yuma County, and Kit Carson <br />County. None of the streams in thissubregion originate in the foothills or mountains. The region is <br />bounded as follows: <br /> <br />. On the south by the Republican River - Arkansas River basin divide; <br />. On the north by the Republican River - South Platte River basin divide; <br /> <br />The regression equation for this subregion is only valid for natural tributary streams that have <br />drainage areas between 1 mi2 and 1300 mil. 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. Users need to be cautioned that there is significant soil i'!filtration variability within this <br />subregion. The regression equation may not appropriately estimate peakflow values depending on <br />the watershed characteristics (especially for watersheds located in sand hills areas). <br /> <br />The equation for subregion REP-l is: <br /> <br />Q = 289.1(AJ'67 <br /> <br />Where: <br />A = Drainage Area, square miles (1 <A<1300) <br />Q = 100 year peak flow, efs <br /> <br />Republican River Basin Regression Analysis Summary <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 />REP-! Republican Q - 289.1(A)661 29 ! 1300 . .906 36% <br /> basin <br /> <br />2! <br />