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Figure 4 <br />Diversions from Surface Water and Ground Water <br />1800000 <br />1600000 <br />1400000 <br />y 1200000 <br />N <br />L <br />~ 1000000 <br />c <br />O 800000 <br />•L <br />>_ 600000 <br />400000 <br />200000 <br /> <br /> <br /> <br /> <br /> <br /> ~ <br />~ <br />« • <br />~ <br />~ , I~• ~ I <br /> <br />• I <br />a I <br />I • <br />I , I ~ '~ " • ~ • ~ <br />• • <br />• ~, ~ <br />~ ~ 'I <br />^ <br /> <br />1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 <br />Surface Water Diversion - - Ground Water Diversion <br />Figure 5 shows the average annual calculated application efficiencies for surface and <br />ground water supplies. The average annual surface water application efficiency from <br />1950 through 2002 was approximately 53 percent while the average annual ground water <br />efficiency (pumping) was approximately 67 percent. Note that surface water application <br />efficiencies generally reflect flood irrigation practices, while ground water efficiencies <br />reflect a combination of flood and sprinkler irrigation practices. As shown in Figure 5, <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 as ground water use become more prevalent through the 1990s and excess <br />surface water is diverted for ground water recharge and not used directly to satisfy crop <br />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 />cureport_6-2004.doc 6 of 48 June, 2004 <br />