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<br />COL-5: TOMICm CREEK SUBREGION <br /> <br />This subregion includes the Tomichi Creek mainstem and its tributaries upstream of the City of <br />Gwmison. Streams in this subregion are located in portions of Gwmison County and Saguache <br />County, The 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 tributary streams that have <br />drainage areas between 100 mi2 and 1,070 mil. A detailed study or other hydrologic analysis <br />must be performed for projects involving streams with drainage areas that fall outside of the <br />applicable range. <br /> <br />The equation for subregion COL-5 is: <br /> <br />Q = 84.7(A).487 <br /> <br />Where: <br />A = Drainage Area, square miles (lOO<A<1,070) <br />Q = 100 year peak flow, cfs <br /> <br />25 <br />