U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2005-5074
Sacramento, California 2005
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Historically, the U.S. Air Force Plant 42 has relied on ground water as the primary source of water owing, in large part, to the scarcity of surface water in the region. Groundwater withdrawal for municipal, industrial, and agricultural use has affected ground-water levels at U.S. Air Force Plant 42, and vicinity. A study to document changes in groundwater gradients and to present historical water-level data was completed by the U.S. Geological Survey in cooperation with the U.S. Air Force. This report presents historical water-level data, hydrographs, and generalized seasonal water-level and water-level contours for September–October 2000 and March–April 2001. The collection and interpretation of ground-water data helps local water districts, military bases, and private citizens gain a better understanding of the ground-water flow systems, and consequently water availability.
During September–October 2000 and March–April 2001
the U.S. Geological Survey and other agencies made a total of
102 water-level measurements, 46 during September–October
2000 and 56 during March–April 2001. These data document
recent conditions and, when compared with historical data,
document changes in ground-water levels. Two water-level
contour maps were drawn: the first depicts water-level conditions
for September–October 2000 map and the second depicts
water-level conditions for March–April 2001 map. In general,
the water-level contour maps show water-level depressions
formed as result of ground-water withdrawal. One hundred
sixteen long-term hydrographs, using water-level data from
1915 through 2000, were constructed to show water-level
trends in the area. The hydrographs indicate that water-level
decline occurred throughout the study area, with the greatest
declines south of U.S. Air Force Plant 42.
Abstract
Introduction
Acknowledgments
Description of Study Area
Geohydrology
Ground-Water Levels and Movement
Water-Level Changes
References Cited
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