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GROUND WATER IN THE CENTRAL VALLEY, CALIFORNIA A19 <br />250 <br />200 <br />150 <br />100 <br />50 <br />uj Sea <br />> level <br />UJ <br />CO <br />LLJ <br />0 <br />50 <br />300 <br />10N/1E-33A01M <br />Amtude, 120 feet <br />\10N/1E-28K01M <br />Altitude, 109 feet <br />10N/1E-23Q02M <br />Altitude, 87 feet <br />g <br />LLJ <br />CD 200 <br />OC <br />O <br />UJ <br />> 100 <br />O <br />CD <br />< <br />fc Sea <br />level <br />100 <br />200 <br />^ 300 <br />UJ <br />-J 350 <br />cc <br />UJ <br />I II I I <br />NOTE: Vertical scale is 2 times that of other hydrographs <br />20S/18E-36D01M <br />Altitude, 260 feet <br />Depth, 1,400 feet <br />20S/18E-11Q03M <br />Altitude, 268 feet <br />Perforations, 1,885 to 1,930 feet <br />20S/18E-11Q01M <br />Altitude, 268 feet <br />Depth, 710 feet <br />D 20S/18E-06D01M <br />** Altitude, 317 feet <br />Depth, 1,017 feet <br />_|_____I_____I_____I_____I_____I_____I <br />20S/19E-09A01M <br />Altitude, 224 feet <br />300 <br />250 <br />200 <br />150 <br />100 <br />50 <br />31S/29E-9A01M <br />Altitude, 468 feet <br />I I I <br />31S/29E-29A01M <br />-Altitude, 400 feet <br />Depth, 530 feet <br />31S/29E-20M02M <br />Altitude, 392 feet <br />Perforations, 170 to 270 feet <br />31S/29E-34A01M <br />Altitude, 413 feet <br />Depth, 800 feet <br />31S/29E-12M01lti <br />Altitude, 513 feet <br />Perforations, 380 to 982 feet <br />1925 30 35 40 45 50 55 <br />YEAR <br />60 65 70 75 1980 <br />FIGURE 12. Representative hydrographs showing long-term changes in ground-water levels in the Central Valley <br />(modified from Williamson and others, 1989). See figure 5 for well-numbering system. A, Wells in Central <br />Valley near Woodland. B, Wells on west side of San Joaquin Valley north of Kettleman City. C, Wells in <br />southern San Joaquin Valley near Bakersfield.