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Brackish Resource Aquifer Characterization System Water Quality Calculations

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Texas Water Development Board
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Metadata

Point locations of the wells with calculated total dissolved solids concentrations (in milligrams per liter) in the Brackish Resource Aquifer Characterization System (BRACS) database.

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Metadata

Update Type

Manual

Update Frequency

Quarterly

Quality Control Level

Manual Spot Check

Data Contact Email

Caveats and Usage

Be aware that most of the locations of wells in this shapefile are not verified by TWDB BRACS staff and may be inaccurate. The BRACS Database and Data Dictionary are available on our website (see Supporting URLs).

Citation

Texas Water Development Board (TWDB). Brackish Resource Aquifer Characterization System Water Quality Calculations, https://txwaterdatahub.org/dataset/bracs-water-quality-calculations. 2023-12-10.

Collection Method

Other

Collection Method Description

We calculate total dissolved solids concentration (in milligrams per liter) from applicable geophysical well logs. See field TDS_method for information regarding salinity calculation method used.

Quality Control Level

Manual Spot Check

Quality Assurance Description

Typically, before total dissolved solids (TDS) concentration calculations are done, we establish well pairs: a well pair consists of a well with a measured groundwater sample located proximal to a well with a geophysical log from which a calculated value of total dissolved solids concentration can be derived. The total dissolved solids concentration from the geophysical log is “calibrated” to the sample result by adjusting the parameters that are included in the calculation. If a calculated value is within the range of measured values or plus-minus ten percent, then it is considered a pair for the purposes of determining characteristic parameter values for a certain formation. The parameter values that are derived from the well pair calibration are then used as study-wide values.

Spatial Coverage

Bounding Coordinates

  • North: 36.50853
  • East: -93.51963
  • South: 25.77887
  • West: -106.62922

Coordinate System

NAD83

Spatial Description

Statewide in Texas

Disclaimer

The data provided in these files is accurate as of the date of the file. The TWDB provides this information as a public service in accordance with its statutory responsibility. Users of this data are responsible for checking the accuracy, completeness, currency, or suitability of the information for any particular purpose. The TWDB disclaims any liability for any claims or damages that may result from the use of this data.

Additional Information

Wells with calculated TDS in the BRACS database. The TDS concentrations are calculated from geophysical well logs from oil and gas wells and “calibrated” to available measured water quality samples. For the TDS calculation method used for each well location see field TDS_METHOD.

Program Area

Brackish Resource Aquifer Characterization System (BRACS)

Supporting URLs

https://www.twdb.texas.gov/groundwater/...
https://www.twdb.texas.gov/groundwater/...
https://www.twdb.texas.gov/groundwater/...
https://www.twdb.te...
https://www.twdb.te...
https://www.twdb.te...

Data Contact Email

Categories

Tags

Spatial Keywords

Summary
Update Type Manual
Update Frequency Quarterly
Quality Control Level Manual Spot Check
Data Contact Email

Caveats and Usage

Be aware that most of the locations of wells in this shapefile are not verified by TWDB BRACS staff and may be inaccurate. The BRACS Database and Data Dictionary are available on our website (see Supporting URLs).

Citation

Texas Water Development Board (TWDB). Brackish Resource Aquifer Characterization System Water Quality Calculations, https://txwaterdatahub.org/dataset/bracs-water-quality-calculations. 2023-12-10.

Collection Method

Other

Collection Method Description

We calculate total dissolved solids concentration (in milligrams per liter) from applicable geophysical well logs. See field TDS_method for information regarding salinity calculation method used.

Quality Control Level

Manual Spot Check

Quality Assurance Description

Typically, before total dissolved solids (TDS) concentration calculations are done, we establish well pairs: a well pair consists of a well with a measured groundwater sample located proximal to a well with a geophysical log from which a calculated value of total dissolved solids concentration can be derived. The total dissolved solids concentration from the geophysical log is “calibrated” to the sample result by adjusting the parameters that are included in the calculation. If a calculated value is within the range of measured values or plus-minus ten percent, then it is considered a pair for the purposes of determining characteristic parameter values for a certain formation. The parameter values that are derived from the well pair calibration are then used as study-wide values.

Spatial Coverage

Bounding Coordinates

  • North: 36.50853
  • East: -93.51963
  • South: 25.77887
  • West: -106.62922

Coordinate System

NAD83

Spatial Description

Statewide in Texas

Disclaimer

The data provided in these files is accurate as of the date of the file. The TWDB provides this information as a public service in accordance with its statutory responsibility. Users of this data are responsible for checking the accuracy, completeness, currency, or suitability of the information for any particular purpose. The TWDB disclaims any liability for any claims or damages that may result from the use of this data.

Additional Information

Wells with calculated TDS in the BRACS database. The TDS concentrations are calculated from geophysical well logs from oil and gas wells and “calibrated” to available measured water quality samples. For the TDS calculation method used for each well location see field TDS_METHOD.

Program Area

Brackish Resource Aquifer Characterization System (BRACS)

Supporting URLs

https://www.twdb.texas.gov/groundwater/...
https://www.twdb.texas.gov/groundwater/...
https://www.twdb.texas.gov/groundwater/...
https://www.twdb.te...
https://www.twdb.te...
https://www.twdb.te...

Data Contact Email

Categories

Tags

Spatial Keywords

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