Shapefile
Tags
Texas, Aquifers
This layer contains the minor underground aquifers found in Texas. This polygon file was designed for medium to small scale thematic mapping and analysis.
The spatial data were obtained from the Texas Water Development Board (TWDB) and are current as of 2007. Attributes were modified to include only aquifer name, code, and area information. The coordinate system of this data is WGS 1984.
"Lines were digitized from the Bureau of Economic Geology's Geologic Atlas Sheets (GAT) at 1:250,000 scale. Work started in January 1990 and was completed in May 1990. All digitizing was done at the USGS office in Austin, Texas using Arc/Info. REVISIONS MADE TO THE MAJOR AQUIFERS FOR THE 2007 STATE WATER PLAN: The Edwards aquifer southern boundary has been updated based on new geochemical data. The boundary of the 1,000-mg/L line of equal dissolved solids concentration has been revised and moved both to the north and south of the previous boundary. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. In general, the Pecos Valley aquifer is defined by: (1) the occurrence of structural highs that have the potential to form barriers to groundwater flow and (2) the spatial extent of the Pecos Valley sediment. The Pecos Valley aquifer boundary differs from its former boundary in two ways. First, we revised the aquifer boundary, extending the aquifer into New Mexico to coincide with perceived hydrologic boundaries. Second, the old aquifer boundary excluded parts of Loving, Winkler, Ward, Pecos, and Crane counties where the alluvium is thin. This presents a problem to modeling groundwater flow because it incorrectly restricts access to the Pecos River, the main discharge zone. The new aquifer boundary better represent the geology as indicated by the 1:250,000 maps of the Geologic Atlas of Texas by including these areas of thinner alluvium. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. Aware of reports that not all of the mapped Seymour Aquifer held water, TWDB reviewed well information to determine which parts of the aquifer hold water and which parts do not. This review was done prior to developing the groundwater availability model for the Seymour Aquifer.
In the process of developing the model, additional changes were made to the aquifer’s extent. Therefore, TWDB has changed the boundary so that only those sediments that are known to hold groundwater are part of the Seymour Aquifer More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. The Trinity Aquifer extends beneath the Edwards (Balcones Fault Zone) Aquifer ending in the subsurface toward the west in eastern Uvalde County. This subsurface boundary in Uvalde County appears to coincide with the Sabinal River and, therefore, has a great amount of sinuosity and detail. Groundwater in the Trinity Aquifer in Uvalde County presumably flows beneath the Edwards (Balcones Fault Zone) Aquifer toward the south, in the same direction of the Sabinal River, which is probably why TWDB chose the river as the subsurface boundary of the aquifer. However, the boundary has much greater detail than what is known about the groundwater flow line. Therefore, TWDB has smoothed the shape of this line to better reflect the knowledge of its position. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. * The Edwards-Trinity Aquifer (outcrop) lines in West Texas were adjusted to lie adjacent to the updated Pecos Valley aquifer lines. Also, a small part of the outcrop was reclassified to subcrop in order to show the adjusted outcrop of the Pecos Valley aquifer which lies on top of the Edwards-Trinity in northern Pecos County. Also, a small part of the Ogallala aquifer in West Texas (specifically Andrews and Ector counties) was adjusted to lie adjacent to the updated Pecos Valley and Edwards-Trinity aquifer lines." - TWDB
Center for Geospatial Technology, Texas Tech University Texas Water Development Board
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data was prepared for inclusion in the TPWD Base SDE database by the Texas Parks and Wildlife Department GIS Lab. The Texas Parks and Wildlife Department, its employees, and personnel, make no warranty as to its accuracy. The Texas Parks & Wildlife Department, its employees, and personnel MAKE NO WARRANTY FOR FITNESS OF USE FOR A PARTICULAR PURPOSE EXPRESS OR IMPLIED WITH RESPECT TO THIS DATA. THIS IS NOT A SURVEYED PRODUCT. Title 1 Part 10 Chapter 201 Rule §201.6 of the Texas Administrative Code suggests data showing the full extent of Texas be projected in the Texas State Mapping System. This feature class as provided by TPWD is unprojected.</SPAN></P></DIV></DIV></DIV>
Extent
West | -105.849214 | East | -93.609396 |
North | 36.501238 | South | 26.352271 |
Maximum (zoomed in) | 1:5,000 |
Minimum (zoomed out) | 1:150,000,000 |
Lines were digitized from the Bureau of Economic Geology's Geologic Atlas Sheets (GAT) at 1:250,000 scale. Work started in January 1990 and was completed in May 1990. All digitizing was done at the USGS office in Austin, Texas using Arc/Info. The Yegua Jackson aquifer was digitized and added to the original dataset in 2001. REVISIONS MADE TO THE MINOR AQUIFERS FOR THE 2007 STATE WATER PLAN: The boundary of the Blaine aquifer was revised based on current information from well yields, groundwater levels, and groundwater chemistry. It was extended farther south to include most of the larger outcrops of the Blaine Formation. The boundaries of the Blaine Formation are based on the digital Geological Atlas of Texas (see TNRIS). The downdip extent of the aquifer, west of the exposure of the Blaine Formation, includes wells that produce groundwater with total dissolved solids of 10,000 ppm or less. The subsurface boundary along parts of the aquifer to the east includes all wells that draw water from the aquifer, and is not defined in terms of groundwater salinity. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. The Bone Springs–Victorio Peak aquifer is defined on the east by the center line of the Salt Basin, the original, pre-development discharge for groundwater flow in the area. Its southern boundary coincides with the Bitterwell Break, a Tertiary normal fault, out of the Salt Basin. This feature reportedly corresponds to a groundwater divide. Moving westward, the southern boundary transfers from the Bitterwell Break to the Babb Flexure, a structural hinge or bend in the rocks. To the northwest, the boundary follows a flow line based on the area’s potentiometric surface. The northern extent of the aquifer in Texas is defined by the state line with New Mexico. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. The revised boundary for the Igneous aquifer encloses contiguous Tertiary igneous rocks. Large exposures of pre-Tertiary, mainly Cretaceous, age rocks were kept outside of the boundary. It is defined to include the majority of wells drawing from Tertiary igneous rocks. For the most part, the boundary follows that defined by the USGS. However, the revised boundary excludes the northernmost extension of the USGS boundary in Culberson County since that area consists of mostly Permian rocks, and includes areas of Tertiary rocks that are within a LBG-Guyton boundary in the northeast part of the study area. We included an area in the southwest part of the proposed boundary because that area appears to contain Tertiary igneous rocks overlain by Quaternary sediments. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. The revised boundary for the Lipan aquifer includes Quaternary alluvium, mainly Qau, outside the present boundary. By including more alluvium the Lipan aquifer is coincident with the boundary for the Edwards-Trinity Plateau aquifer to the north, west, and south. To the east the boundary remains essentially unchanged, occurring at the boundary between the Leona Formation and the Permian Clear Fork Group or Lueders Formation. The boundary of the GAM model, defined by the groundwater divide, is used to determine a subsurface limit for the Lipan aquifer to the south. The northern edge of the Edwards-Trinity Plateau aquifer defines the northern subsurface boundary. The contact between the Permian Clear Fork Group and the Lueders Formation is extended along strike to the south to delineate an eastern subsurface limit. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp. Minor adjustments to the eastern boundary of the 'Presidio-Redford' portion of the West Texas Bolsons aquifer were done to show the contact with the new Igneous aquifer boundary. Minor adjustments were also made to show the contact with a smaller portion of the 'bolsons'/Igneous boundary in western Jeff Davis and southern Culberson county. (Editing was done in ArcGIS 9.1) Original contact information for this dataset: Mark Hayes TWDB mailing and physical address: 1700 North Congress Avenue PO Box 13231 Austin, Texas 78711-3231 USA (512)936-0828 (voice) (512)463-8423 (fax) mark.hayes@twdb.state.tx.us
Center for Geospatial Technology, Texas Tech University Texas Water Development Board
publication date
8 am - 5 pm, Mon - Fri
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This data was prepared for inclusion in the TPWD Base SDE database by the Texas Parks and Wildlife Department GIS Lab. The Texas Parks and Wildlife Department, its employees, and personnel, make no warranty as to its accuracy. The Texas Parks & Wildlife Department, its employees, and personnel MAKE NO WARRANTY FOR FITNESS OF USE FOR A PARTICULAR PURPOSE EXPRESS OR IMPLIED WITH RESPECT TO THIS DATA. THIS IS NOT A SURVEYED PRODUCT. Title 1 Part 10 Chapter 201 Rule §201.6 of the Texas Administrative Code suggests data showing the full extent of Texas be projected in the Texas State Mapping System. This feature class as provided by TPWD is unprojected.</SPAN></P></DIV></DIV></DIV>
8 am - 5 pm, Mon - Fri
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Feature geometry.
ESRI
Coordinates defining the features.
Aquifer Name
TWDB
The number '0' refers to a hole in the aquifer (no outcrop or subcrop/downdip). The number '1' refers to the outcrop (at the surface). The number '2', refers to the subcrop or downdip (below the surface).
TWDB
Area of feature in internal units squared.
ESRI
Positive real numbers that are automatically generated.
8 am - 5 pm, Mon - Fri
This is a dataset containing what the Texas Water Development Board (TWDB) in Austin, Texas considers the 21 Minor aquifers of Texas.
To update the delineations for the minor aquifers of Texas for the purpose of adding them to the 1991 Water Plan.
This feature class is a component of TPWD 'base' data.
'Base' data includes current, statewide geospatial information intended to provide context for mapping purposes.
Lines were digitized from the Bureau of Economic Geology's Geologic Atlas Sheets (GAT) at 1:250,000 scale. Work started in January 1990 and was completed in May 1990. All digitizing was done at the USGS office in Austin, Texas using Arc/Info.
The Yegua Jackson aquifer was digitized and added to the original dataset in 2001.
REVISIONS MADE TO THE MINOR AQUIFERS FOR THE 2007 STATE WATER PLAN: The boundary of the Blaine aquifer was revised based on current information from well yields, groundwater levels, and groundwater chemistry. It was extended farther south to include most of the larger outcrops of the Blaine Formation. The boundaries of the Blaine Formation are based on the digital Geological Atlas of Texas (see TNRIS). The downdip extent of the aquifer, west of the exposure of the Blaine Formation, includes wells that produce groundwater with total dissolved solids of 10,000 ppm or less. The subsurface boundary along parts of the aquifer to the east includes all wells that draw water from the aquifer, and is not defined in terms of groundwater salinity. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp.
The Bone Springs–Victorio Peak aquifer is defined on the east by the center line of the Salt Basin, the original, pre-development discharge for groundwater flow in the area. Its southern boundary coincides with the Bitterwell Break, a Tertiary normal fault, out of the Salt Basin. This feature reportedly corresponds to a groundwater divide. Moving westward, the southern boundary transfers from the Bitterwell Break to the Babb Flexure, a structural hinge or bend in the rocks. To the northwest, the boundary follows a flow line based on the area’s potentiometric surface. The northern extent of the aquifer in Texas is defined by the state line with New Mexico. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp.
The revised boundary for the Igneous aquifer encloses contiguous Tertiary igneous rocks. Large exposures of pre-Tertiary, mainly Cretaceous, age rocks were kept outside of the boundary. It is defined to include the majority of wells drawing from Tertiary igneous rocks. For the most part, the boundary follows that defined by the USGS. However, the revised boundary excludes the northernmost extension of the USGS boundary in Culberson County since that area consists of mostly Permian rocks, and includes areas of Tertiary rocks that are within a LBG-Guyton boundary in the northeast part of the study area. We included an area in the southwest part of the proposed boundary because that area appears to contain Tertiary igneous rocks overlain by Quaternary sediments. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp.
The revised boundary for the Lipan aquifer includes Quaternary alluvium, mainly Qau, outside the present boundary. By including more alluvium the Lipan aquifer is coincident with the boundary for the Edwards-Trinity Plateau aquifer to the north, west, and south. To the east the boundary remains essentially unchanged, occurring at the boundary between the Leona Formation and the Permian Clear Fork Group or Lueders Formation. The boundary of the GAM model, defined by the groundwater divide, is used to determine a subsurface limit for the Lipan aquifer to the south. The northern edge of the Edwards-Trinity Plateau aquifer defines the northern subsurface boundary. The contact between the Permian Clear Fork Group and the Lueders Formation is extended along strike to the south to delineate an eastern subsurface limit. More information on the new aquifer boundary can be found in the Texas 2007 State Water plan at http://www.twdb.state.tx.us/home/index.asp.
Minor adjustments to the eastern boundary of the 'Presidio-Redford' portion of the West Texas Bolsons aquifer were done to show the contact with the new Igneous aquifer boundary.
Minor adjustments were also made to show the contact with a smaller portion of the 'bolsons'/Igneous boundary in western Jeff Davis and southern Culberson county.
(Editing was done in ArcGIS 9.1)
Original contact information for this dataset:
Mark Hayes
TWDB
mailing and physical address:
1700 North Congress Avenue
PO Box 13231
Austin, Texas 78711-3231
USA
(512)936-0828 (voice)
(512)463-8423 (fax)
mark.hayes@twdb.state.tx.us
publication date
None.
This data was prepared for inclusion in the TPWD Base SDE database by the Texas Parks and Wildlife Department GIS Lab. The Texas Parks and Wildlife Department, its employees, and personnel, make no warranty as to its accuracy. The Texas Parks & Wildlife Department, its employees, and personnel MAKE NO WARRANTY FOR FITNESS OF USE FOR A PARTICULAR PURPOSE EXPRESS OR IMPLIED WITH RESPECT TO THIS DATA. THIS IS NOT A SURVEYED PRODUCT.
Title 1 Part 10 Chapter 201 Rule §201.6 of the Texas Administrative Code suggests data showing the full extent of Texas be projected in the Texas State Mapping System. This feature class as provided by TPWD is unprojected.
Dataset copied.
Dataset copied.
Dataset copied.
Dataset copied.
Metadata imported.
Dataset copied.