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tine 1'~.pr~ K:uierl'1OJ Sande Buttoudand \11 R \ i.7g (rnual high F'Luu~. RuwLrtu I'an R(16761'll;I('O United States Department of Agriculture Natural Resources Conservation Service Ecological Site Description Wyunun(r _ - - Site Type: Rangeland NebresM .~ Site Name: Sandy Bottomland sr n Site ID: R0678Y031CO I __ Major Land Resource Area: 676 -Central High Plains. Southern Part ~ bra Physiographic Features ,__ - This sde occupies the first hood-plain step behveen the streambed and Knnaos I Culurodu higher sandy terraces It may also be found m a few sandy valleys and -- drainayeways where there is some effect from extra moisture Topography is nearly level to gently sloprng Surface may be smooth or exhibit minor undulations ' I Landform: flood plain, flood-plain step Aspect: N!A _ __ _ _ _ _ I _ Minimum Maximum ____ Elevation (feed: 3800 5600 Slope (percent): 0 3 Water Tablo Depth (inches): 60 60 Flooding: Frequency: rare frequent Duration; very beef brief Ponding: Depth (inches): p p Frequency: none none Duration: none none Runoff Class: neghy~ble very low Climatic Features The mean average annual precipitafion vanes from 12 to 16 inches per year depending on location and ranges from less than 8 inches to over 20 inches per year Approximately 75 percent of the annual precipitation occurs during the growing season from rtnd-April to late-September. Snowfall can vary greatly from year to year but averages 35 to 45 inches per year. VJinds are estimated to average about 9 miles per hour annually. ranging from 10 miles per hour during the spring to 9 miles per hour during late summer Daytime winds are generally stronger than nighttime and occasional strong storms may bang periods of high winds with gusts to more than 90 miles per hour The average length of the growing season Is 142 days, but vanes from 129 to 154 days The average date of first frost in the fall is September 28 and the last frost in the spring is about May 9 July Is the hottest month and December and January are the coldest. It is not uncommon for the temperature to exceed 100 degrees F during the summer. Summer humidity rs low and evaporation is high. The winters are characterized with frequent northerly winds, producing severe cold with temperatures dropping to -35 degrees F or lower. 'technical Gurdc I;SUr1 NK(:S Secuon Illy. I kc~ i:(W