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A28 <br />123 C <br />REGIONAL AQUIFER-SYSTEM ANALYSIS-CENTRAL VALLEY, CALIFORNIA <br />122° 121° 120° 119°118 C <br />40' <br />39' <br />38' <br />37' <br />36' <br />35' <br />EXPLANATION <br />CHANGE IN HYDRAULIC HEAD, IN FEET <br />Rise of 0 to 10 <br />Decline from 0 to 40 <br />Decline from 40 to 80 <br />Decline from 80 to 120 <br />Decline from 120 to 200 <br />Decline from 200 to 300 <br />Decline from 300 to 400 <br />Decline of more than 400 <br />R <br />FIGURE 18. Estimated change in hydraulic head in lower pumped zone from 1860 to 1961 (modified from Williamson and others, 1989).