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<br />The equation for subregion SPL-I is: <br /> <br />Q = 707.9(A).654 <br /> <br />Where: <br />A = Drainage Area, square miles (2<A <1090) <br />Q = 100 year peak flow, cfs <br /> <br />SPL-2: SOUTHERN FOOTHILLS SUBREGION <br /> <br />This subregion includes stream reaches in the southern foothills area of the South Platte River <br />basin, The streams in this subregion may have part of their drainage basins above an elevation of <br />7500' MSL, but this subregion only includes stream reaches that are downstream of (below) the <br />7500' elevation limit. The subregion is bounded as follows: <br /> <br />. On the south by the South Platte River-Arkansas River basin divide; <br />. On the east by the Kiowa Creek-West Bijou Creek basin divide; <br />. And on the east by the Kiowa Creek-Comanche Creek basin divide (to the south of Elbert); <br />. And on the east by the Box Elder Creek-Kiowa Creek basin divide (to the north of Elbert); <br />. On the north by the southern boundary of the Urban Drainage and Flood Control District; and <br />. On the west by an elevation line that is generally 7500' <br /> <br />The regression equation for this subregion is only valid for natural tributary streams that have <br />drainage areas between 1 mi2 and 170 mil. A detailed study or other hydrologic analysis must be <br />performed for projects involving streams with drainage areas that fall outside of the applicable <br />range. <br /> <br />The equation for subregion SPL-2 is: <br /> <br />Q = lOOS.S(A)"638 <br /> <br />Where: <br />A = Drainage Area, square miles (1 <A <170) <br />Q = 100 year peak flow, cfs <br /> <br />SPL-3: CENTRAL FOOTIDLLS SUBREGION <br /> <br />This subregion includes stream reaches in the central foothills area of the South Platte River basin <br />that are located to the west of the western boundary of the Urban Drainage and Flood Control <br />District. The streams in this subregion may have part of their drainage basins above an elevation <br />of7500' MSL, but this subregion only includes stream reaches that are downstream of (below) the <br />7500' elevation limit. The subregion is bounded as follows: <br /> <br />17 <br />