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<br />The equation for subregion ARK-3 is: <br /> <br />Q = l089.3(A)o.653 <br /> <br />Where: <br />A = Drainage Area, square miles (I <A <930) <br />Q = 100 year peak flow, cfs <br /> <br />ARK-4a: NORTHERN FOOTHILLS SUBREGION; WEST OF MONUMENT CREEK <br />AND FOUNTAIN CREEK <br /> <br />This subregion includes streams in the northern foothills area which are tributary to and west of the <br />Monwnent Creek and Fountain Creek (downstream of Monwnent Creek) mainstems. The <br />subregion is bounded as follows: <br /> <br />· On the east by the Monwnent Creek mainstem; <br />. And on the east by the Fountain Creek mainstem (downstream of it confluence with Monwnent <br />Creek); <br />. On the north by the Arkansas River-South Platte River basin divide; <br />. On the west by the basin divide between the following watersheds: <br />1. 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; and <br />. On the west by the basin divide between the following watersheds: <br />1, streams flowing into the Arkansas River or Fountain Creek downstream of its <br />confluence with Williams Creek <br />2. the Chico Creek watershed <br /> <br />The Woodland Park/Rampart Range area was included in this subregion, despite its high elevation <br />(up to about 9,000 feet), because the flow values from the study in that area fit much better with the <br />other data used for this subregion. The regression equation for this subregion is only valid for <br />tributary streams that have drainage areas between 1 mi2 and 26 mil. The mainstems of Fountain <br />Creek and Monument Creek are exempt from this subregion due to available detailed hydrology <br />information on these streams. Stream reaches within the incorporated area of Colorado Springs <br />are also exempf from this subregion. Any jufure study in this subregion involving the Fountain <br />Creek mainstem, Monument Creek mainstem, or streams within the City of Colorado Springs <br />should be performed using detailed melhods. A delailed sludy or olher hydrologic analysis must <br />be performed for project involving streams with drainage areas that fall outside of the applicable <br />range. <br /> <br />12 <br />