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<br /> <br />. <br /> <br />00312,2 <br /> <br />TENTATIVE PLANS FOR LOCAL PROTECTION l^JORKS <br />CATAGORY I, AhlR - GRANADA, COLORADO <br />WOLF CREEK <br /> <br />HYDROLOGY <br /> <br />-I. General Hydrolo~ic Data. - The drainage area of Wolf Creek <br /> <br /> <br />at Granada, Colorado, is approximately 127 square miles. The drainage <br /> <br />area above the proposed dam site is approximately 115 square miles. <br /> <br />About four square miles of drainage area is intervening between the <br /> <br />proposed dam site and U. S. Highway No. 50 bridge located west of <br /> <br />Granada. The remaining drainage area lies north and east of U. S. <br /> <br />Highway No. 50 and from this point the original channel has been diverted <br /> <br />eastward through an old drainage ditch, to the Arkansas River. The <br /> <br />terrain rises from elevation 3480 feet in the vicinity of Granada to <br /> <br />elevation 4300 feet in the hills about 20 miles south of Granada. The <br />average slope of Wolf Creek in the vicinity of the U. S. Highway No. 50 <br /> <br />bridge is 18 feet per mile. A maP of the general area is shown on <br /> <br />plate 1. <br /> <br />2. The avera~e annual precipitation for Holly, based on 56 years <br />. of record is 15.08 inches. The maximum observed 24-hour precipitation <br />was 3.25 inches which occurred on June 6, 1903. Maximum and minimum <br /> <br />recorded temperatures at Holly which has 48 years of record are 110 and <br /> <br />-23 degrees, respectively. <br /> <br />3. Flood producing storms over Wolf Creek are generally of the <br /> <br />thunderstorm type and occur during the summer months. There are no <br /> <br />records of stream gaging stations on Wolf Creek. Estimates have been, <br /> <br />made Of peak discharges for some of the damaging floods of recent <br /> <br />years. The first flood of which an estimate is available occurred <br /> <br />"', <br /> <br />