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VERHOEFF PIT # 2 <br />T _. <br />Site Type: Rangeland EXHIBIT. <br />MLRA: 69 -Upper Arkansas Valley Rolling Plains <br />United States Department of Agriculture <br />Natural Resources Conservation Service <br />Ecological Site Description <br />Site Type: Rangeland ( ~, " <br />Site Name: Gravel Breaks <br />Site ID: R069XY064C0 <br />1``~ fig <br />Major Land Resource Area: 69 -Upper Arkansas Valley ;---~. ~. <br />Rolling Plains ~ Y_.' , <br />Physiographic Features ' ~- <br />This site occurs on gently sloping to moderately steep hills. ~ New Mexic <br />Landform: fan remnants, hill, ridge, terrace Aspect: ' N/A <br />Minimum Maximum <br />Elevation (feet): 3600 6000 <br />Slope (percent): 2 30 <br />Water Table Depth (inches): 60 60 <br />Flooding: <br />Frequency: <br />Duration: <br />Ponding: <br />Depth (inches): <br />Frequency: <br />.Duration: <br />Runoff Class: <br />none none <br />none none <br />0 0 <br />none none <br />none none <br />low very high, <br />ivel Breaks <br />IXY064C0 <br />Colorado <br />Oklahoma <br />Climatic Features <br />The mean average annual precipitation varies from 10 to 14 inches per year depending on location <br />and ranges from 5 inches to over 24 inches per year. Approximately 75 percent of the annual <br />precipitation occurs during the growing season from mid-April to late-September. Snowfall can vary <br />greatly from year to year and can range from 20 to 40 inches per year. Winds are estimated to <br />average about 6 to 7 miles per hour annually. Daytime winds are generally stronger than nighttime <br />and occasional strong storms may bring brief periods of high winds with gusts to more than 60 miles <br />per hour. <br />The average length of the growing season is 155 days, but varies from 147 to 162 days. The average <br />date of first frost in the fall is October 10, and the last frost in the spring is about May 5. July is the <br />hottest month and January is the coldest. It is not uncommon for the temperature to exceed 100 <br />degrees F during the summer. Summer humidity is low and evaporation is high. The winters are <br />characterized with frequent northerly winds, producing severe cold with temperatures dropping to as <br />low as -35 degrees F. <br />Technical Guide USDA NRCS <br />Section IIE 1 Rev. 3/04 <br />