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<br />12 <br /> <br />Irrioation Well Reoistrations <br /> <br />Irrigation w~ll registrations for Water 'District 2 show the following <br />dates of well drilling and number of wells by decades I <br /> <br />, <br /> <br />, <br /> <br />1900 to 1909, inclusive 7 <br />1910 to 1919, 33 <br />1920 to 1929, 80 <br />1930 to 1939, 270 <br />1940 to 1949, 340 <br />19~0 to 19~9, 634 <br />1960 to 1968, l~+ <br />Total irrigation wells l,~~2+ <br /> <br />It can be seen from the' above that more than one-half of the irri- <br />gation wells in use in Water District 2 have been drilled since 19~0. <br />About 20 percent of the irrigation wells were drilled during the two years <br />of 19~4 and 19~~. The average registered yield of all irrigation wells is <br />slightly over 800 gallons per minute, or about 1.8 cubic foet per second. <br />Experience shows that the registered well yields are generally high, how. <br />ever since it is also true that all irrigation wells are not registered it <br />is quite likely that the total irrigation well capacity in Water District 2 <br />is at least 2,800 cubic feet per second.' This amounts to more than the <br />surface water decrees senior to 1890 and is, theoretically, a sufftcient <br />water supply to irrigate over 100,000 acres during the peak water demand <br />p~i~. ' <br /> <br />In addition, there al11 approximately 260 commercial, industrial, and <br />municipal w~lls in Water District 2 which have an average registered yi'eld <br />of about 2a~gallons per minute. These wells, although lower in'discharge <br />capacity, generally pump many more hours per year than do the irrigation <br />wells. . <br /> <br />. <br /> <br />Estimated sUDDlv. utilization. and Dotential <br /> <br />Through test drilling and examination of well logs in the area the <br />U. S. Geological Survey has made estimates of the amount of groundwater <br />in storage in various sections of Water District 2. From field studies, <br />and discharge measurements, they have also estimated the average amount <br />of groundwater pumped in each section. Table 1 relays this information. <br /> <br />It Can be seen from this table that the actively used portion of the <br />groundwater reservoir amounts to about 10 percent of the total storage <br />capacity. Records of groundwater elevations in a number of observation <br />wells throughout the area taken by Colorado State University since 1930 <br />show 'a very stable groundwater situation. <br />