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<br />COL-4: UPPER GUNNISON RIVER SUBREGION <br /> <br />This subregion includes the Gunnison River, East River, Taylor River, and Ohio Creek mainstems <br />and their tributaries generally upstream of the City of Gunnison. Streams in this subregion are <br />located in Gunnison County, This subregion does not include the Tomichi Creek basin. The <br />subregion is bounded as follows: <br /> <br />. On the north by the Tomichi Creek - Taylor River basin divide; <br />. On the east by the Tomichi Creek - Arkansas River basin divide; <br />. On the south by the Tomichi Creek - Rio Grande basin divide; and <br />. On the west by the basin divide between Tomichi Creek and Cebolla Creek/South Beaver <br />Creek, <br /> <br />The regression equation for this subregion is only valid for natural Iributary slreams that have <br />drainage areas between 20 mi2 and 300 mi2. A detailed study or other hydrologic analysis must <br />be performed for projects involving slreams with drainage areas that fall outside of Ihe applicable <br />range. <br /> <br />The equation for subregion COL-4 is: <br /> <br />Q = SO.1(A).838 <br /> <br />Where: <br />A = Drainage Area, square miles (20<A<300) <br />Q = 100 year peak flow, cfs <br /> <br />24 <br />