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
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A<br />
11N/1E-24Q8<br />
0 50 100Miles<br />
0 50 100 Kilometers<br />
Shaded relief derived from U.S. Geological Survey<br />
National Elevation Dataset, 2006. Albers Equal Area Conic Projection<br />
A<br />
14S/12E-12H1<br />
18S/16E-33A1<br />
Development <strong>and</strong> Changes to the Hydrologic Budget 99<br />
EXPLANATION<br />
Area of subsidence due to compaction<br />
of peat <strong>and</strong> based on field surveys in 1952<br />
Area of subsidence due to compaction<br />
of peat, more than 10 feet as of 1981<br />
Area of subsidence due to hydrocompaction<br />
Area of subsidence due to water-level<br />
decline, more than 1 foot as of 2000<br />
Historic lakes<br />
Major l<strong>and</strong>-subsidence area from Irel<strong>and</strong>, 1984.<br />
Simulated subsidence 1962-2003, in feet<br />
5<br />
10<br />
<strong>Central</strong> <strong>Valley</strong> boundary<br />
Subsidence measurement locations<br />
(extensometers)—Data for labeled<br />
sites shown on figure 15B<br />
13S/15E-31J3<br />
B<br />
17S/15E-14Q1<br />
C<br />
23S/25E-16N3<br />
32S/28E-20Q1<br />
Figure B15. A, Areal extent of l<strong>and</strong> subsidence in the <strong>Central</strong> <strong>Valley</strong> (modified from figure 9 Thomas <strong>and</strong> Phoenix, 1976; figure 11<br />
Bertoldi <strong>and</strong> others, 1991) <strong>and</strong> locations of extensometers. Contours show simulated subsidence for water years 1962-2003.<br />
B, Compaction data from selected extensometers <strong>and</strong> total simulated pumpage in the <strong>Central</strong> <strong>Valley</strong>.
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