Typical limestone formation in the Edwards aquifer recharge zone. Projects related to the Edwards Aquifer are listed below. Filter Total Items: 4. Year Select Year Apply Filter. Date published: May 29, Contacts: Allan K Clark. Filter Total Items: 8. Year Published: Water-quality observations of the San Antonio segment of the Edwards aquifer, Texas, with an emphasis on processes influencing nutrient and pesticide geochemistry and factors affecting aquifer vulnerability, —16 As questions regarding the influence of increasing urbanization on water quality in the Edwards aquifer are raised, a better understanding of the sources, fate, and transport of compounds of concern in the aquifer—in particular, nutrients and pesticides—is needed to improve water management decision-making capabilities.
Opsahl, Stephen P. View Citation. Opsahl, S. Geological Survey Scientific Investigations Report —, 67 p. Year Published: New insights into nitrate dynamics in a karst groundwater system gained from in situ high-frequency optical sensor measurements Understanding nitrate dynamics in groundwater systems as a function of climatic conditions, especially during contrasting patterns of drought and wet cycles, is limited by a lack of temporal and spatial data.
Slattery, Richard N. Slattery, R. Geological Survey Fact Sheet —, 2 p. Geological Survey Scientific Investigations Report —, 41 p. Clark, Allan K. Clark, A. Year Published: Source, variability, and transformation of nitrate in a regional karst aquifer: Edwards aquifer, central Texas. Thomas, Jonathan V. Thomas, J. Year Published: New insights into the Edwards Aquifer—Brackish-water simulation, drought, and the role of uncertainty analysis The Edwards aquifer is an important water resource in south-central Texas, providing water for residents, businesses, and ecosystems.
Foster, Linzy K. These aquifers are a critical source of water for Texas, supplying 62 percent of the About 76 percent of this water is used for irrigation, with irrigators withdrawing most of this water from the Ogallala Aquifer alone 72 percent of all groundwater used for irrigation, or 4.
About 36 percent of water used to meet municipal demands is from groundwater. The Geologic Atlas of Texas illustrates the surface extent of geologic formations and aquifers across the state.
The surface extent, or outcrop, of each aquifer is the area in which the host formations are exposed at the land surface. This aquifer consists of isolated areas of alluvium found in parts of 25 north-central and Panhandle counties in the upper Red River and Brazos River basins.
Eastward-flowing streams during the Quaternary Period deposited discontinuous beds of poorly sorted gravel, sand, silt, and clay that were later dissected by erosion, resulting in the isolated remnants of the formation. Individual accumulations vary greatly in thickness, but most of the Seymour is less than feet.
The lower, more permeable part of the aquifer produces the greatest amount of groundwater. Irrigation pumpage accounted for 94 percent of the total use from the aquifer in Water quality generally ranges from fresh to slightly saline. However, the salinity has increased in many heavily pumped areas to the point where the water has become unsuitable for domestic and municipal use.
Natural salt pollution in the upper reaches of the Red and Brazos river basins precludes the full utilization of these water resources. These aquifers are located in El Paso and Hudspeth counties in far West Texas and occur in Tertiary and Quaternary basin-fill deposits that extend northward into New Mexico and westward into Mexico.
The Hueco Bolson, located on the eastern side of the Franklin Mountains, consists of up to 9, feet of clay, silt, sand, and gravel and is an important source of drinking water for both El Paso and Juarez, Mexico.
Located west of the Franklin Mountains, the Mesilla Bolson reaches up to 2, feet in thickness and contains three separate water-producing zones. Historical large-scale groundwater withdrawals, especially for the municipal uses of El Paso and Juarez, have caused major water-level declines and significantly changed the direction of flow, causing a deterioration of the chemical quality of the groundwater in the aquifer, according to El Paso Water Utilities and the USGS.
Municpal water use in accounted for 87 percent of total use from the Hueco-Mesilla Bolson. El Paso, however, has reduced its use of groundwater from the Hueco Bolson since , and observation wells indicate that water levels have stabilized.
In , 72 percent of groundwater pumped from the aquifer was used for irrigation, and the rest is withdrawn for industrial uses, power supply, and municipal use. Consisting of up to 1, feet of alluvial fill, the aquifer occupies two hydrologically separate basins: the Pecos Trough in the west and the Monument Draw Trough in the east.
Water is generally hard and contains dissolved-solids concentrations ranging from less than to more than 5, parts per million. Water-level declines in excess of feet have occurred in Reeves and Pecos counties but have slowed since the mids with the decrease in irrigation pumpage. Declines continue in Ward County due to increased municipal and industrial pumping. Learn More. Published by tsha distributed in partnership with the university of texas at austin.
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