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A preliminary assessment of land-surface subsidence in the El Paso area, Texas

Water-Resources Investigations Report 85-4155

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Abstract

The Hueco bolson deposits in the El Paso area consist mostly of lenses of gravel, sand, silt, and clay. In the Rio Grande Valley , about 400 to 450 feet of these deposits have been eroded and replaced with as much as 200 feet of alluvium. Groundwater in the shallow alluvial aquifer in the Rio Grande Valley in the Hueco bolson aquifer outside the valley is under water table conditions, whereas groundwater in the bolson aquifer in the valley is under leaky artesian conditions. In the downtown area of El Paso, water level declines of 125 and 150 feet have occurred in the shallow and Hueco bolson aquifers, respectively. Surveys that releveled bench marks along lines to the northeast, the southeast, and along the Rio Grande commonly show subsidence of 0.2 foot and a maximum of 0.41 foot near the river. A comparison of subsidence, water level declines, and clay thickness along the three survey lines shows the expected correlation of greater subsidence for thicker accumulated clay material for a given decline in water levels. Data are not sufficient to determine if the preconsolidation stress has been exceeded. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A preliminary assessment of land-surface subsidence in the El Paso area, Texas
Series title:
Water-Resources Investigations Report
Series number:
85-4155
Edition:
-
Year Published:
1985
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
vi, 96 p. :ill., maps ;28 cm.