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A24 <br />123° <br />REGIONAL AQUIFER-SYSTEM ANALYSIS-CENTRAL VALLEY, CALIFORNIA <br />122° 121° 120° 119°118° <br />40' <br />39' <br />38' <br />37' <br />36' <br />35° ~ <br />Red Bluff <br />EXPLANATION <br />LINE OF EQUAL ANNUAL PUMPAGE <br />Interval 1 foot <br />Alluvial <br />boundary <br />50 100 MILES <br />50 100 KILOMETERS <br />FIGURE 15. Ground-water pumpage in the Central Valley for 1975 and 1977 (modified from Williamson and others, 1989). A, 1975 (wet year). <br />B, 1977 (drought year).