2020-01-21_PERMIT FILE - M2019046 (2)

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12/9/2019 ESD Printable Report its W Physiographic Image.-Loamy Plains,LRUs A 8 B Block Diagram Landform: (1)Plain (2)Fan (3)Terrace Minimum Maximum Elevation(feet): 4000 5400 Slope(percent): 0 10 Flooding Frequency. None None Ponding Depth(inches): 0 0 Frequency. None None Runoff class: Very low High Aspect: No Influence on this site Climatic Features LRU A in the Arkansas River Valley,is the hottest and driest portion of the MLRA.Mean Annual Precipitation(MAP)is 10-12 inches. LRU B is the largest extent,MAP is 12-14 inches.The climate information provided below are combined averages across the LRU A and B extent.The mean annual air temperature is 50-54 degrees,and the combined MAP is 10-14 Inches.Approximately 75%of the annual precipitation occurs during the growing season from mid-April to late September.Snowfall can vary greatly from year to year and can range from 20 to 40 inches per year.Winds are estimated to average 6 to 7 miles per hour annually.Daytime winds are generally stronger than nighttime and occasional strong storms may bring brief periods of high winds with gusts to more than 60 miles per hour.The average length of the freeze-free period (28°F)is 162 days.The average date of first freeze(28°F or below)in the fall is October 16 and the average last freeze in the spring is April 21.The average length of the frost-free period(below 32°F)is 140 days.The average date for first frost in the fall(32°F),is October 9th.The last frost in the spring is May 1 st.July is the hottest month and January is the coldest. It is not uncommon for temperature to exceed 100°F during the summer.Summer humidity is low and evaporation is high.The winters are characterized with frequent northerly winds,producing severe cold with temperatures dropping to-30°F.Southeastern Colorado was strongly affected by extended drought conditions in the"Dust Bowl"period of the 1930's,with recurrent drought cycles in the 1950's and 1970's.Extreme to exceptional drought conditions have re-visited the area from 2002 to 2012,with brief interludes of near normal to normal precipitation years.Dust storms reminiscent of the Dust Bowl era may still form during drought years,in windy periods.The long-term effects of these latest drought years have yet to be determined.Growth of native cool season plants begins about April 15 and continues to mid-June.Native warm season plants begin growth about May 1 and continue to about August 15.Regrowth of cool season plants occurs in September and October in most years,depending on moisture.For detailed information and specific climate stations of interest,visit the Western Regional Climate Center website at http://www.wrcc.dri.edu/ Averagad Frost-free period(days): 152 Freeze-free period(days): 173 Mean annual precipitation(inches): 13.12 Month y PLe-cipitatigil-(Inches),- Jan Eeb Mar ARr May Jun JILT Aug .9gp 9-Qt Imo[ D-e-c High 0.53 0.52 1.30 1.86 2.46 2.12 2.95 2.93 1.28 1.41 0.71 0.50 Medium 0.31 0.28 0.80 1.08 1.48 1.34 1.93 2.01 0.78 0.59 0.26 0.27 Low 0.12 0.13 0.43 0.50 0.74 0.83 0.93 1.17 0.46 0.20 0.10 0.16 https://esis.sc.egov.usda.gov/ESDReporttfsReportPrt.aspx?id=R069XY006CO&rptLevel=all&approved=yes&repType=regular&scros=&comm= 2118