Edwards-Trinity (High Plains) Aquiferinteractive map | cross-section

Summary

The Edwards-Trinity (High Plains) Aquifer is a minor aquifer that underlies about 9,000 square miles of the Ogallala Aquifer in western Texas and eastern New Mexico. Its water-producing units include sandstone of the Antlers Formation (Trinity Group) and limestone of the overlying Comanche Peak and Edwards formations. Regional groundwater flow in the aquifer is to the southeast, but locally flow is determined by the presence of Ogallala-filled paleochannels incised into the Cretaceous limestone. Recharge to the aquifer is primarily due to downward leakage from the younger Ogallala Aquifer. The greatest amount of recharge most likely occurs where low-permeability clay layers of the Duke Creek and Kiamichi formations, which lie between the Edwards-Trinity (High Plains) and Ogallala aquifers, are missing or thin or relatively permeable.

Groundwater typically contains more total dissolved solids than does the overlying Ogallala Aquifer. It generally is slightly saline, with total dissolved solids ranging from 1,000 to 2,000 milligrams per liter, but can range from 400 to more than 3,000 milligrams per liter. Groundwater is poorest in quality, with total dissolved solids in excess of 20,000 milligrams per liter, where the aquifer is overlain by saline lakes or the gypsum-rich Tahoka and Double Lakes formations. Freshwater saturated thickness in the aquifer averages 126 feet.

The aquifer provides water for irrigation, which uses approximately 95 percent of all groundwater that is pumped. Water level declines have occurred in some irrigated areas.

Reports

ID Date Type Description
B-6010 11/1/1960 Groundwater bulletin Geology and Ground-Water Resources of Hale County, Texas
R-015 2/1/1966 TWDB numbered report Ground-Water Resources of Gaines County, Texas
GMA2_DFC_01 8/5/2010 DFC submission Desired future conditions for the Ogallala, Dockum, and Edwards-Trinity (High Plains) aquifers
R-314 3/1/1989 TWDB numbered report Hydrogeology of Lower Cretaceous Strata Under the Southern High Plains of Texas and New Mexico
B-6310 12/1/1973 Groundwater bulletin Reconnaissance Investigation of the Ground-Water Resources of the Brazos River Basin, Texas
R-313 2/1/1989 TWDB numbered report Evaluation of Ground-Water Resources in Briscoe, Hale, and Swisher Counties, Texas
GR11-009_MP 6/24/2011 GAM run - Management Plan Management plan information for High Plains UWCD No. 1
GT11-010 6/14/2011 GAM task Total pumping estimates for the Ogallala, Edwards-Trinity (High Plains), and Dockum aquifers in High Plains UWCD No. 1
GR09-027 6/21/2010 GAM run Predictive simulations for the Ogallala and Edwards-Trinity (High Plains) aquifers in Groundwater Management Area 7
GR09-023 5/21/2010 GAM run Predictive simulation for the Ogallala and Edwards-Trinity (High Plains) aquifers in Groundwater Management Area 2
GR09-018_MP 7/24/2009 GAM run - Management Plan Management plan information for Llano Estacado UWCD
GR09-007_MP 3/17/2009 GAM run - Management Plan Management plan information for Garza County UWCD
GR09-006_MP 3/17/2009 GAM run - Management Plan Management plan information for High Plains UWCD No. 1
GR09-005_MP 3/17/2009 GAM run - Management Plan Management plan information for Sandy Land UWCD
GT10-023 6/8/2010 GAM task Predictive simulations for the Ogallala and Edwards-Trinity (High Plains) aquifers in Groundwater Management Area 2
GR12-008_MP 6/20/2012 GAM run - Management Plan Management plan data for Mesa UWCD
GR10-030_MAG 6/22/2011 GAM run - MAG Managed available groundwater for the Ogallala and Edwards-Trinity (High Plains) aquifers in Groundwater Management Area 2
R-380 7/1/2011 TWDB numbered report Aquifers of Texas
GR13-022_MP 8/28/2013 GAM run - Management Plan Management plan data for Sandy Land UWCD
GR13-021_MP 8/28/2013 GAM run - Management Plan Management plan data for Garza County UWCD
GT13-026_TERS 9/19/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 2
GT13-042_TERS 11/1/2013 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage by county for aquifers in High Plains UWCD No. 1
GR14-002_MP 6/30/2014 GAM run - Management Plan Management plan data for Llano Estacado UWCD
GT15-006_TERS 12/17/2015 GAM task - Total Estimated Recoverable Storage Total Estimated Recoverable Storage for aquifers in Groundwater Management Area 1
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