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GROUND WATER IN THE CENTRAL VALLEY, CALIFORNIA A3 <br />Agriculture is the major commercial activity in the <br />valley, providing jobs for about 30 percent of the popu- <br />lation and cash receipts to farmers of about $13 billion in <br />1983. The Central Valley contains 5 of the top 10 <br />agricultural counties (in value of crops sold) in the United <br />States, including Fresno (number 1), Kern (number 2), <br />and Kings (number 3). To support this level of agricul- <br />tural activity in an area that is deficient in precipitation <br />requires a substantial amount of irrigation water. During <br />the 1960's and 1970's, an average of 22 million acre-ft of <br />120 <br />EXPLANATION <br />HYDROGRAPHIC SUBREGIONS CONSTITUTING <br />THE CENTRAL VALLEY <br />S Sacramento <br />D Delta <br />SJ San Joaquin <br />T Tulare <br /> AREAL EXTENT OF CENTRAL VALLEY <br />AQUIFER SYSTEM <br />HYDROGRAPHIC SUBREGION BOUNDARY <br />^"VSJjNSn 1-- ^«'V '^ *M? f * - % - 1 -.A^ '«Jv\ /--A .T-*:' ; <br />50 100 KILOMETERS <br />EX'CO <br />FIGURE 1. Location of study area. A, Shaded relief map of California showing Central Valley drainage basins. B, Counties <br />and cities of the Central Valley.