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Last modified
5/14/2010 8:58:16 AM
Creation date
9/30/2006 10:00:00 PM
Metadata
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Template:
Publications
Year
1999
Title
Sustainability of Ground-Water Resources: U.S. Geological Survey Circular 1186
CWCB Section
Interstate & Federal
Author
William M. Alley, Thomas E. Reilly, O. Lehn Franke
Description
Illustration of the hydrologic, geologic, and ecological concepts to assure wise and sustainable use of ground-water resources
Publications - Doc Type
Historical
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<br /> <br /> <br />, <br /> <br />"-. -'~r-< ...".. -r~_ <br />_ ., .~ ")$ .. l.l~S. <br />~? <br />~'" . " <br /> <br />Under natural conditions, water levels in wells completed in many <br />confined aquifers rise above the land surface, resulting in artesian <br />flow. The well shown in the photograph was drilled near Franklin, <br />Virginia, in 1941 to a depth of about 600 feet in confined aquifers. <br />The initial water level in the well was about 7 feet above land surface. <br />The above-ground structure shown in the photograph (Cederstrom, <br />1945) was built in the 1940's as a creative solution to measure the <br />water level in this well. Measurements at the well were discontinued <br />in 1960. Today, measurements at other nearby wells indicate that <br />water levels are now 150 to more than 200 feet below land surface. <br />
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