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<br />. On the south by an elevation line that is generally 7500'; <br />. On the east by the western boundary of the Urban Drainage and Flood Control District; <br />. On the north by the Lefthand Creek-St. Vrain Creek basin divide; <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 beIWeen 1 mi2 and 175 mi2. A detailed study or other hydrologic analysis must be <br />performed for projects involving streams within the Urban Drainage and Flood Control District <br />and streams with drainage areas that fall outside of the applicable range. <br /> <br />The equation for subregion SPL-3 is: <br /> <br />Q = 762.4(A}"546 <br /> <br />Where: <br />A = Drainage Area, square miles (1 <A<175) <br />Q = 100 year peak flow, cfs <br /> <br />SPL-4: NORTHERN FOOTIDLLS SUBREGION <br /> <br />lbis subregion includes stream reaches in the northern 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 northern boundary of the Urban Drainage and Flood Control District; <br />. On the southeast by the South Platte River mainstem between the northern boundary of the <br />Urban Drainage and Flood Control District and the town of Dent; <br />. On the east by an arc that passes through the following three locations: <br />1. The town of Dent <br />2. The town of Bracewell <br />3, The confluence of Owl Creek and Lone Tree Creek <br />. On the northeast by the Owl Creek-Lone Tree Creek basin divide; <br />. On the north by the Colorado-Wyoming state line; <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 beIWeen 1 mi2 and 445 mi2. The mainstems of the South Platte River, Cache La <br />Poudre River below Poudre Park, Big Thompson River below Drake" and St. Vrain Creek below <br />Lyons are all exempt from this subregion. The incorporated areas of Fort Collins are also exempt <br />from this subregion. A detailed study or other hydrologic analysis must be performed for projects <br />involving those streams and streams with drainage areas that fall outside of the applicable range. <br /> <br />18 <br />