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Data for timescales of water-quality change in a karst aquifer, south-central Texas


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Musgrove, M., Solder, J.E., Opsahl, S.P., and Wilson, J.T., 2019, Data for timescales of water-quality change in a karst aquifer, south-central Texas: U.S. Geological Survey data release,


Continuous monitoring and discrete water-quality sampling were coupled in a karst aquifer to assess drivers and timescales of water-quality change. Water-quality data included environmental tracers of groundwater age (tritium [3H], tritiogenic helium-3 [3He-trit], sulfur hexafluoride [SF6], carbon-14 [14C], and radiogenic helium-4 [4He-rad]). All water quality data is available from the U.S. Geological Survey NWIS database (U.S. Geological Survey, 2019). Groundwater ages were estimated by calibration of environmental tracers to lumped parameter models of groundwater age for multiple samples collected at six groundwater wells using the program TracerLPM (Jurgens and others, 2012). The final estimates for mean groundwater age ranged [...]


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Data were collected from three primary groundwater wells during 2013-2017 as one component of the National Water-Quality Assessment project’s Enhanced Trends Network (ETN) study. ETN samples for dissolved gases and environmental tracers were collected from three wells that withdraw water from the Edwards (Balcones Fault Zone) aquifer in central Texas (referred to herein by its common name [the Edwards aquifer]). Ancillary tritium (3H) data obtained from three additional wells completed in the Edwards aquifer were also considered. Data are used to understand the age and vulnerability of the aquifer to natural and anthropogenic contaminants. For more information about the data collection and interpretation of dissolved gases and groundwater age, please read the process steps provided in this metadata (xml) file and in the journal article associated with this data release and citations therein.



  • National Water-Quality Assessment Project
  • USGS Data Release Products



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DOI doi:10.5066/P9247J56

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