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Table 20 provides the average monthly calculated application efficiencies for surface <br />water and ground water supplies. Note that surface water efficiencies generally reflect <br />flood irrigation practices while ground water efficiencies include a combination of flood <br />and sprinkler irrigation practices. Figure 18 shows the same data by year. As shown, <br />ground water efficiencies have increased with the increased use of sprinkler application <br />methods, beginning in the early 1970s. Surface water application efficiencies generally <br />decreased throughout the 1980s and 1990s as ground water use become more prevalent <br />and excess surface water was not used directly by several of the larger canals to satisfy <br />crop irrigation water requirements. Variations in surface water efficiencies is affected by <br />hydrology and, as shown, with limited available surface water in the 2000 through 2002 <br />period, surface water application efficiencies increased. <br />Table 20 <br />Average Monthly Calculated Application Efficiencies - 1950 through 1997 <br />Diversion Type Apr May Jun Jul Aug Sep Oct <br />Surface Water 49 % 51 % 53 % 57 % 58 % 54 % 50 <br />Ground Water 65 % 69 % 68 % 68 % 67 % 65 % 63 <br />Figure 18 <br />Surface Water and Ground Water Efficiencies <br />80% <br />70% <br />60% <br />C <br />V 50% <br />L <br />a <br />~ 40% <br />v <br />c <br />N <br />~U 30% <br />w <br />20% <br />10% <br />0% <br />,. • ~ <br />.~ <br />•~ i <br />1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 <br />Surface Water System Efficiency Ground Water Application Efficiency <br />cureport_6-2004.doc 44 of 48 June, 2004 <br />