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As presented in Table 18, approximately 52 percent of the crop consumptive use is <br />satisfied from surface water over the study period. Figure 15 shows annual percent of <br />consumptive use from surface water plus the yearly acreage with available ground water <br />supply. As shown, surface water tended to be a higher percent of the total consumptive <br />use in the early part of the study period prior to the prevalent use of ground water. <br />However, since the mid-1970s, surface water use as a percent of total consumptive use is <br />driven by hydrology (surface water availability) and the general preference to use <br />groundwater over surface water on lands served by a sprinkler. <br />90% <br />80% <br />70% <br />60% <br />7 <br />~ 50% <br />a <br />n <br />40% <br />U 30% <br />c <br />v <br />U <br />v 20% <br />a <br />10% <br />Figure 15 <br />Percent Consumptive Use Met by Surface Water and Acreage <br />with Available Ground Water Supply <br />0% ~-r~ <br />1950 <br />1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 <br />-Percent of CU Met by Surface Water Ground Water Acreage <br />350000 <br />300000 <br />250000 ~ <br />m <br />v <br />U <br />200000 Q <br />v <br />m <br />150000 ~ <br />c <br />0 <br />100000 (7 <br />50000 <br />0 <br />cureport_6-2004.doc 40 of 48 June, 2004 <br />