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Minor Aquifers

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Texas Water Development Board
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Metadata

The Texas Water Development Board (TWDB) has identified and characterized 9 major and 22 minor aquifers in the state based on the quantity of water supplied by each. A major aquifer is generally defined as supplying large quantities of water in large areas of the state. Minor aquifers typically supply large quantities of water in small areas or relatively small quantities in large areas. This dataset contains the 22 minor aquifers in the state of Texas.

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Metadata

Update Type

Automatic

Update Frequency

As needed

Quality Control Level

Comprehensive Review (multiple people)

Data Contact Email

Caveats and Usage

The "aquifer" attribute has up to 3 values. A '0' value denotes a 'hole' in the aquifer (no outcrop or downdip). A '1' value denotes the 'outcrop' of the aquifer (surface exposure). A '2' value denotes the 'downdip' of the aquifer (below surface).

Citation

Texas Water Development Board (TWDB). Minor Aquifers, https://txwaterdatahub.org/dataset/minor-aquifers. 2023-12-10.

Collection Method

Digitization

Collection Method Description

Arclines were digitized in Arc/Info using GAT 1:250,000 paper maps from the Bureau of Economic Geology (BEG) at the USGS office in Austin, TX. Lines were delineated where necessary by geologists at the Texas Water Development Board, Water Supplies Section. Digitizing was done using an Altex digitizing tablet and a 'PRIME' server. Data was transferred to 9mm tape by the USGS and given to the GIS section of the TWDB for further conversion into Arc/Info format. Arclines were then grouped and coded by aquifer (number). Data was projected to Lambert Conformal Conic (custom) projection (in meters) using Arc/Info. Data was then built as a line cover and then as a polygon cover, labels were created as well as additional fields for further descriptive purposes

Quality Control Level

Comprehensive Review (multiple people)

Quality Assurance Description

Minor Aquifer boundaries along the state line were edited to align with the state boundary layer (current as of 07/03/2019) to correct for sliver and gaps.

Spatial Coverage

Bounding Coordinates

  • North: 36.57446
  • East: -93.33727
  • South: 25.46916
  • West: -106.88736

Coordinate System

NAD83

Spatial Description

Statewide

Disclaimer

Although any data within this file geodatabase have been subjected to standard TWDB review protocols and is substantially complete, the TWDB reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data is released on condition that neither the TWDB nor the State of Texas shall be held liable for any damages resulting from its authorized or unauthorized use. Please note that any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the TWDB nor the State of Texas.

Supporting URL

http://www.twdb.texas.gov/mapping/gisda...
http://www.twdb.tex...

Data Contact Email

Categories

Tags

Spatial Keywords

Summary
Update Type Automatic
Update Frequency As needed
Quality Control Level Comprehensive Review (multiple people)
Data Contact Email

Caveats and Usage

The "aquifer" attribute has up to 3 values. A '0' value denotes a 'hole' in the aquifer (no outcrop or downdip). A '1' value denotes the 'outcrop' of the aquifer (surface exposure). A '2' value denotes the 'downdip' of the aquifer (below surface).

Citation

Texas Water Development Board (TWDB). Minor Aquifers, https://txwaterdatahub.org/dataset/minor-aquifers. 2023-12-10.

Collection Method

Digitization

Collection Method Description

Arclines were digitized in Arc/Info using GAT 1:250,000 paper maps from the Bureau of Economic Geology (BEG) at the USGS office in Austin, TX. Lines were delineated where necessary by geologists at the Texas Water Development Board, Water Supplies Section. Digitizing was done using an Altex digitizing tablet and a 'PRIME' server. Data was transferred to 9mm tape by the USGS and given to the GIS section of the TWDB for further conversion into Arc/Info format. Arclines were then grouped and coded by aquifer (number). Data was projected to Lambert Conformal Conic (custom) projection (in meters) using Arc/Info. Data was then built as a line cover and then as a polygon cover, labels were created as well as additional fields for further descriptive purposes

Quality Control Level

Comprehensive Review (multiple people)

Quality Assurance Description

Minor Aquifer boundaries along the state line were edited to align with the state boundary layer (current as of 07/03/2019) to correct for sliver and gaps.

Spatial Coverage

Bounding Coordinates

  • North: 36.57446
  • East: -93.33727
  • South: 25.46916
  • West: -106.88736

Coordinate System

NAD83

Spatial Description

Statewide

Disclaimer

Although any data within this file geodatabase have been subjected to standard TWDB review protocols and is substantially complete, the TWDB reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data is released on condition that neither the TWDB nor the State of Texas shall be held liable for any damages resulting from its authorized or unauthorized use. Please note that any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the TWDB nor the State of Texas.

Supporting URL

http://www.twdb.texas.gov/mapping/gisda...
http://www.twdb.tex...

Data Contact Email

Categories

Tags

Spatial Keywords

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