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A4 REGIONAL AQUIFER-SYSTEM ANALYSIS—CENTRAL VALLEY,CALIFORNIA <br /> irrigation water was required annually--about one-half water increases; during wet years, the amount supplied <br /> from ground water and one-half from surface water. by surface water increases. During the early to middle <br /> During drought years, the amount supplied by ground 1980's, the overall usage of irrigation water increased <br /> 123' 122" 121' 120" 119" 118° <br /> Red Bluff <br /> 40° �'li9 ■ <br /> C[ming <br /> EXPLANATION <br /> .y CI,IL'❑ <br /> —_— COUNTY BOUNDARY (some counties bounded <br /> entirely by rivers] <br /> �r� L.IIE` A,eary5wlle <br /> LILJr- <br /> W imams 1%9 G� <br /> 39"— <br /> ptlnnrgAn`.� I � <br /> CQ ` SaCrarnenlo <br /> WaWlal.d• �p <br /> �0! I QP`r <br /> VaCavi++E' ■ 9y0 <br /> Rei •.tg�/I LCA11• �' <br /> 38" J �� <br /> CONTRA r SAN JOAQUIN 1 <br /> COSTA J'r <br /> �Mupestc <br /> f <br /> STANISLAUS �- <br /> Alluvial <br /> boundary r+arcea� <br /> + MERCEO <br /> 37' �!;MADERA <br /> Fresno r <br /> FRESNO <br /> 1� Visalia <br /> 1 Hanlord r <br /> kellleman I <br /> f I Ii11S <br /> 36' KINGS <br /> I <br /> TU LARE <br /> I <br /> 0 50 100 MILES <br /> 0 50 100 KILOMETERS KERN <br /> Bakersfield <br /> 35` B <br /> FiGuRE 1.—Continued <br />