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<br /> <br />-11- <br /> <br /> <br />approximately 30 inches. <br />Growing Season <br />The growing season is short, 90 to lZO days. <br />Temperature <br />During summer, the days are warm and the nights are <br />cool. Winter is cold, occasionally down to 300F below zero. <br />Geology <br />The Closed Basin of the San LUis Valley is a shallow <br />depression or topographically closed area within a large <br />valley which is filled with alluvial sediments washed into <br />it from the high mountain ranges bounding it,on the east, <br />west and north. The maximum depth of these alluvial sedi- <br />ments is not yet known but oil exploration drilling and <br />seismic surveys show evidence that they extend to several <br />thousands of feet below the present land surface. The <br />water-bearing layers of these sediments extend practically <br />from the surface to at least as deep as the sediments have <br />been drilled and probably to their full depth. At this <br />time the depth of the deepest water producing well in the <br />Closed Basin is reported to be greater than 2,000 feet. <br />Most wells in the Valley, both within and outside of the <br />Closed Basin are, to some degree, artesian, with many of <br />them flowing. Even the lowest estimates of ground water <br />in storage in the entire San Luis Valley run as high as <br />several hundred million acre-feet. The Closed Basin area is <br /> <br />included within this area. <br /> <br />000395 <br /> <br /> <br />.... <br />