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<br />The equation for subregion SPL-4 is: <br /> <br />Q = 800.8(A)"478 <br /> <br />Where: <br />A = Drainage Area, square miles (1 <A<445) <br />Q = 100 year pealdlow, cfs <br /> <br />SPL-5: MOUNTAINS SUBREGION <br /> <br />This subregion includes stream reaches in the mountains areas of the South Platte River basin, <br />except for the South Park area, The streams in this subregion have 100% of their drainage basins <br />and stream reaches above an elevation of7500' MSL. 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 an elevation line that is generally 7500'; <br />. On the north by Colorado-Wyoming state line; <br />. On the west by the South Platte River-Laramie River basin divide; <br />. And on the west by the South Platte River-Colorado River basin divide; <br />. And on the west by the South Platte River-Arkansas River basin divide. <br /> <br />The regression equation for this subregion is only valid for natural tributary streams that have <br />drainage areas between 2 mi2 and 480 mi2 Streams within the incorporated areas of Blackhawk <br />and Central City and the mainstem of the South Platte River are exempt from this subregion. The <br />South Park area is not included in this subregion, and is an area of no regression. A detailed <br />study or other hydrologic analysis must be performed for projects within the exempted areas and <br />for streams wilh drainage areas that fall outside of the applicable range. <br /> <br />The equation for subregion SPL-5 is: <br /> <br />Q = 39.4(A)"776 <br /> <br />Where: <br />A = Drainage Area, square miles (2<A<480) <br />Q = 100 year peak flow, cfs <br /> <br />19 <br />