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A4 REGIONAL AQUIFER-SYSTEM ANALYSIS-CENTRAL VALLEY, CALIFORNIA <br />irrigation water was required annually about one-half <br />from ground water and one-half from surface water. <br />During drought years, the amount supplied by ground <br />water increases; during wet years, the amount supplied <br />by surface water increases. During the early to middle <br />1980's, the overall usage of irrigation water increased <br />123°122 C 121'120°119°118° <br />40' <br />39' <br />38' <br />37' <br />36' <br />35° - <br />EXPLANATION <br />___ __ COUNTY BOUNDARY (some counties bounded <br />entirely by rivers) <br />( Siockton /\ <br />CONTRA-^ I SANJOAQUIN/ <br />COSTA W / <br />Modestn <br />Alluvial <br />boundary <br />I . 1 <br />Hanford \ <br />Kettleman ( <br />i Hills <br />I KINGS <br />100 KILOMETERS <br />FIGURE 1. Continued