Central Valley Aquifer, Chapters A and B - MAE Class Websites
Central Valley Aquifer, Chapters A and B - MAE Class Websites Central Valley Aquifer, Chapters A and B - MAE Class Websites
98 Groundwater Availability of the Central Valley Aquifer, California - and ). The increased - Land Subsidence - others (1999) compiled a summary on the phenomena of land - 1991) ( - - - other four processes (Williamson and others, 1989). - - 2 ( others, 1975). 2 2 in the 2 Ireland and others, 1984) (- caused inelastic compaction of the clayey beds and resulted ( and fraction of the total simulated aquifer-system compaction in affected by subsidence (mented that as much as 4 ft of subsidence has occurred in the feet in the early 1990s (Ikehara, 1995).
A 11N/1E-24Q8 0 50 100Miles 0 50 100 Kilometers Shaded relief derived from U.S. Geological Survey National Elevation Dataset, 2006. Albers Equal Area Conic Projection A 14S/12E-12H1 18S/16E-33A1 Development and Changes to the Hydrologic Budget 99 EXPLANATION Area of subsidence due to compaction of peat and based on field surveys in 1952 Area of subsidence due to compaction of peat, more than 10 feet as of 1981 Area of subsidence due to hydrocompaction Area of subsidence due to water-level decline, more than 1 foot as of 2000 Historic lakes Major land-subsidence area from Ireland, 1984. Simulated subsidence 1962-2003, in feet 5 10 Central Valley boundary Subsidence measurement locations (extensometers)—Data for labeled sites shown on figure 15B 13S/15E-31J3 B 17S/15E-14Q1 C 23S/25E-16N3 32S/28E-20Q1 Figure B15. A, Areal extent of land subsidence in the Central Valley (modified from figure 9 Thomas and Phoenix, 1976; figure 11 Bertoldi and others, 1991) and locations of extensometers. Contours show simulated subsidence for water years 1962-2003. B, Compaction data from selected extensometers and total simulated pumpage in the Central Valley.
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98 Groundwater Availability of the <strong>Central</strong> <strong>Valley</strong> <strong>Aquifer</strong>, California<br />
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