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<br />Where: <br />A = Drainage Area, square miles (12<A<280) <br />Q = 100 year peak flow, cfs <br /> <br />ARK-3: CENTRAL FOOTIDLLS SUBREGION <br /> <br />Ibis subregion includes streams within the central foothills area, The streams in this subregion <br />may have part of their drainage basins above an elevation of 7500' MSL, but the subregion only <br />includes stream reaches that are downstream of (east of) the 7500' elevation limit. This subregion <br />is bounded as follows: <br /> <br />. On the south by the Greenhorn Creek-Huerfano River basin divide; <br />. And on the south by the basin divide between the following watersheds: <br />I. streams flowing into the Huerfano River upstream of and including the Cucharas <br />River <br />2. streams flowing into the Huerfano River downstream of its confluence with the <br />Cucharas River; <br />. On the east (south of the Arkansas River mainstem) by the Huerfano River-Apishapa River <br />basin divide; <br />. On the northeast by the Arkansas River mainstem between its confluence with Huerfano Creek <br />and its confluence with Chico Creek; <br />. And on the northeast by the basin divide between the following watersheds: <br />1. streams flowing into the Arkansas River or Fountain Creek downstream of its <br />confluence ~th Williams Creek; and <br />2. the Chico Creek watershed <br />. And on the northeast by the basin divide between the following watersheds: <br />I. streams flowing into Fountain Creek (from the west) upstream of and <br />including Young Hollow; and <br />2. streams flowing into the Arkansas River or Fountain Creek (from the west) <br />downstream of its confluence with Young Hollow <br />. On the north by the Arkansas River-South Platte River Basin divide; <br />. On the northwest by the Fourmile Creek-Currant Creek basin divide; and <br />. On the southwest by an elevation line of generally 7500'; <br /> <br />The Cripple Creek area was included in this subregion, despite its high elevation (about 10,000 <br />feet), because the flow values from the Cripple Creek study fit much better with the other data used <br />for this subregion. The regression equation for this subregion is only valid for tributary streams <br />that have drainage areas between 1 mi2 and 930 mil. The mainstems of the Arkansas River and <br />Fountain Creek are exempt from this subregion. A detailed study or other hydrologiC analysis must <br />be performedfor projects involving the Arkansas River and Fountain Creek mainstems or streams <br />with drainage areas thatfall outside of the applicable range. <br /> <br />11 <br />