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Summary of extensometric measurements in El Paso, Texas

Water-Resources Investigations Report 2003-4158

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Abstract

Two counter-weighted-pipe borehole extensometers were installed on the left bank of the Rio Grande between El Paso, Texas, and Ciudad Juarez, Chihuahua, Mexico, in 1992. A shallow extensometer measures vertical compaction in the 6- to 100-meter aquifer-system depth interval. A deep extensometer measures vertical compaction in the 6- to 305-meter aquifer-system depth interval. Both extensometers are referenced to the same surface datum, which allows time-series differencing to determine vertical compaction in the depth interval between 100 and 305 meters. From April 2, 1993, through June 13, 2002, 1.6 centimeters of compaction occurred in the 6-to 305-m depth interval. Until February 1999, most aquifer-system compaction occurred in the deeper aquifer-system interval between 100 and 305 meters, from which ground water was extracted. After that time, compaction in the shallow interval from 6 to 100 meters was predominant and attained a maximum of 7.6 millimeters by June 13, 2002. Minor residual compaction is expected to continue; continued maintenance of the El Paso extensometers would document this process.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Summary of extensometric measurements in El Paso, Texas
Series title:
Water-Resources Investigations Report
Series number:
2003-4158
Edition:
-
Year Published:
2003
Language:
ENGLISH
Description:
iii, 11 p. : ill. (some col.), col. map ; 28 cm.