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GROUND WATER IN THE CENTRAL VALLEY, CALIFORNIA A29 <br />123 C 122 C 12V 120 C 119 C 118 C <br />40 C <br />39 c <br />38 C <br />37 C <br />36 C <br />35° - <br />EXPLANATION <br />AREA OF SUBSIDENCE DUE TO <br />HYDROCOMPACTION <br />AREA WHERE SUBSIDENCE DUE TO WATER- <br />LEVEL DECLINE IS MORE THAN 1 FOOT <br />AREA OF SUBSIDENCE DUE TO COMPACTION OF <br />PEAT AND BASED ON FIELD SURVEYS IN 1952 <br />AREA WHERE SUBSIDENCE DUE TO <br />COMPACTION OF PEAT IS MORE THAN <br />10 FEET AS OF 1981 <br />Davis-Zamora Area <br />Los Banos-Kettleman City Area <br />50 100 MILES <br />50 100 KILOMETERS <br />Tulare-Wasco Area <br />Arvin-Maricopa Area <br />FIGURE 19. Areal extent of land subsidence in the Central Valley (modified from Williamson and others, 1989).