Hydrostratigraphic subdivisions and fault barriers of the Edwards aquifer, south-central Texas, U.S.A.

Maclay, R.W.; Small, T.A.

doi:10.1016/0022-1694(83)90239-1

Cited by 55 publications

(39 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The dissolution or precipitation of common trace minerals in carbonate rocks, such as celestite or gypsum, can also affect water composition. Gypsum is present in Edwards Group rocks (Maclay and Small, 1983) and might affect groundwater sulfate (SO 4 )/ chloride (Cl) ratios and SO 4 concentrations. Saturation index values were evaluated for aragonite, calcite, celestite, dolomite, gypsum, and strontianite and for carbon dioxide and dissolved oxygen gas phases.…”

Section: Numerical and Statistical Methodsmentioning

confidence: 99%

Origin and characteristics of discharge at San Marcos Springs based on hydrologic and geochemical data (2008-10), Bexar, Comal, and Hays Counties, Texas

Musgrove¹,

Crow²

2012

Scientific Investigations Report

View full text Add to dashboard Cite

Section: Numerical and Statistical Methodsmentioning

confidence: 99%

Origin and characteristics of discharge at San Marcos Springs based on hydrologic and geochemical data (2008-10), Bexar, Comal, and Hays Counties, Texas

Musgrove¹,

Crow²

2012

Scientific Investigations Report

View full text Add to dashboard Cite

“…While faults can act as either low-permeability barriers that inhibit fluid flow or as conduits [e.g., Caine et al, 1996], the Silver Creek fault clearly acts to partition the groundwater system. This can be accomplished either when lithologic units of different permeability are juxtaposed during faulting [Maclay and Small, 1983], when sedimentation varies across a syndepositionally active fault [Aydin, 2000], or by the grain size reduction and gouge development in the fault core [Teufel, 1987].…”

Section: Silver Creek Faultmentioning

confidence: 99%

Time‐dependent land uplift and subsidence in the Santa Clara valley, California, from a large interferometric synthetic aperture radar data set

2003

View full text Add to dashboard Cite

[1] We invert 115 differential interferograms derived from 47 synthetic aperture radar (SAR) scenes for a time-dependent deformation signal in the Santa Clara valley, California. The time-dependent deformation is calculated by performing a linear inversion that solves for the incremental range change between SAR scene acquisitions. A nonlinear range change signal is extracted from the ERS InSAR data without imposing a model of the expected deformation. In the Santa Clara valley, cumulative land uplift is observed during the period from 1992 to 2000 with a maximum uplift of 41 ± 18 mm centered north of Sunnyvale. Uplift is also observed east of San Jose. Seasonal uplift and subsidence dominate west of the Silver Creek fault near San Jose with a maximum peak-to-trough amplitude of $35 mm. The pattern of seasonal versus long-term uplift provides constraints on the spatial and temporal characteristics of water-bearing units within the aquifer. The Silver Creek fault partitions the uplift behavior of the basin, suggesting that it acts as a hydrologic barrier to groundwater flow. While no tectonic creep is observed along the fault, the development of a low-permeability barrier that bisects the alluvium suggests that the fault has been active since the deposition of Quaternary units.

show abstract

“…For example, conductive faults and fractures that penetrate multiple hydrogeologic units in a groundwater system might allow vertical movement of groundwater between the units, even if a confining unit is present. Conversely, faults that are only marginally conductive or result in an offset that disconnects a unit from itself horizontally can act as barriers to flow in the vertical, horizontal, or both directions (Maclay and Small, 1983). Scant high-resolution information pertaining to VK and storage in the model area was available; VK typically is determined by using laboratory techniques on cores obtained from well bore holes (Dagan, 1986), and the calculation of storage typically requires lengthy pumping tests with multiple observation wells (Heath, 1983).…”

Section: Vertical Hydraulic Conductivity and Storagementioning

confidence: 99%

Simulation of groundwater flow in the Edwards-Trinity and related aquifers in the Pecos County region, Texas

Clark¹,

Bumgarner²,

Houston³

et al. 2014

Scientific Investigations Report

View full text Add to dashboard Cite

CRANE COUNTY Belding Fort Stockton Pecos R iv e rObliqueFor more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprodTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD83).Altitude, as used in this report, refers to distance above the vertical datum. Simulation of Groundwater Flow in the Edwards-Trinity and Related Aquifers in the Pecos County Region, TexasBy Brian R. Clark, Johnathan R. Bumgarner, Natalie A. Houston, and Adam L. Foster AbstractThe Edwards-Trinity aquifer is a vital groundwater resource for agricultural, industrial, and public supply uses in the Pecos County region of western Texas. The U.S. Geological Survey completed a comprehensive, integrated analysis of available hydrogeologic data to develop a numerical groundwater-flow model of the Edwards-Trinity and related aquifers in the study area in parts of Brewster, Jeff Davis, Pecos, and Reeves Counties. The active model area covers about 3,400 square miles of the Pecos County region of Texas west of the Pecos River, and its boundaries were defined to include the saturated areas of the Edwards-Trinity aquifer. (2008) pumping rates as assigned in scenario 1 with year-round maximum permitted pumping rates in the Belding area. Results of scenario 2 are similar in waterlevel decline and extent as those of scenario 1. The extent of the projected groundwater-level decline in the range from 5.0 to 15.0 feet in the Leon-Belding irrigation area expanded slightly (about a 2-percent increase) from that of scenario 1. Maximum projected groundwater-level declines in the Leon-Belding irrigation area were approximately 31.3 feet in small isolated areas. Scenario 3 evaluated the effects of periodic increases in pumping rates over the 30-year extended period. Results of scenario 3 are similar to those of scenario 2 in terms of the areas of groundwater-level decline; however, the maximum projected groundwater-level decline increased to approximately 34.5 feet in the Leon-Belding area, and the extent of the decline was larger in area (about a 17-percent increase) than that of scenario 2. Additionally, the area of projected groundwater-level declines in the eastern part of the model area increased from that of scenario 2-two individual areas of decline coalesced into one larger area. The localized nature of the projected groundwater-level de...

show abstract

Hydrostratigraphic subdivisions and fault barriers of the Edwards aquifer, south-central Texas, U.S.A.

Cited by 55 publications

References 1 publication

Origin and characteristics of discharge at San Marcos Springs based on hydrologic and geochemical data (2008-10), Bexar, Comal, and Hays Counties, Texas

Origin and characteristics of discharge at San Marcos Springs based on hydrologic and geochemical data (2008-10), Bexar, Comal, and Hays Counties, Texas

Time‐dependent land uplift and subsidence in the Santa Clara valley, California, from a large interferometric synthetic aperture radar data set

Simulation of groundwater flow in the Edwards-Trinity and related aquifers in the Pecos County region, Texas

Contact Info

Product

Resources

About