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<br />DETAILED PROJECT REPORT <br />INVESTIGATION FOR FLOOD PROTECTION <br />GRANADA, COLORADO <br /> <br />APPENDIX I - HYDROLOGY <br /> <br />1. Watershed Description. Wolf Creek originates in the south- <br /> <br />central part of Prowers County, Colorado. This county encompasses some <br /> <br />1640 square miles in the southeaste:rn part of Colorado. l~~e a.rea is <br /> <br />devoted almost exc:lusi vely to agric:ul ture with about half to ranching <br /> <br />and half to farming. The county is entirely in the Great Plains <br /> <br />physiographic province. The draina.ge area of Wolf Creek above Granada <br /> <br />comprises 122 square miles. The stream trends northeastward a.nd enters <br /> <br />the Arkansas River near Granada. The watershed is steep with an average <br /> <br />thalweg slope of about 20 feet per miIe. The area is spanely covered <br /> <br />with vegetation engendered by the semiarid climate. These conditions <br /> <br />tend to produce floods with high peaks and moderate volumes. 'l1lC <br /> <br />watershed for Wolf Creek is shown on Plate 1. <br /> <br />2. Climatological Data. The climate in the vicinity of Granada is <br /> <br />classified as semi-arid continental. It is characterized by mild summers <br /> <br />and cold winters. The nearest climatological station is at Lamar, Colorado, <br /> <br />about 17 miles west of Granada. Data for this station are considered <br /> <br />indicative for Granada. The average annual maximum and minimum temperatures <br /> <br />at Lamar are 69.4 and 37.6 degrees \iith extremes ranging from 111 to -30 <br /> <br />degrees fahrenheit. Average annual rain.fall and snowfall at Lamar are <br /> <br />14.91 and 15.7 inches. During the, storm of June 1965 an unofficial <br />