aquifers in texas by county

Local aquifer: Not all groundwater sites have been associated with a local aquifer. Map of major and minor aquifers in Texas. The aquifer is primarily composed of sand locally interbedded with gravel, silt, clay, and lignite. Official websites use .gov For a deeper dive into principal aquifers:TheGround Water Atlas of the United States(USGS Hydrologic Atlas 730,published inchapters from 1990 to2000) describes the location, hydrologic characteristics, and geologic characteristics of the principal aquifers throughout thefiftyStates, Puerto Rico, and the U.S. Virgin Islands. A major aquifer is generally defined as supplying large quantities of water in large areas of the state. The first 62 editions of the Texas Almanac are fully searchable to aid researchers and students of Texas history. Note that alluvial aquifers north of the limit of continental glaciation are included inSand and gravel aquifers (glaciated regions). Researchers have identified a previously undiscovered aquifer in southwest Texas. In Texas, a minor aquifer is defined as one that supplies large quantities of water in small areas or small quantities of water in large areas. Irrigation pumpage accounted for 94 percent of the total use from the aquifer in 2008. It is the third most important groundwater resource in Texas after the Edwards and the Ogallala aquifers. Aquifers shown on the 2003PrincipalAquifers map, with some additions, were used as the first National AquiferReferenceList in the USGSNational Water Information System(NWIS) in theAggregate Water Use Data System(AWUDS,database released in August 2001). Spaces in crystalline rocks are microscopically small, few, and generally unconnected. 600--Igneous and metamorphic-rock aquifers. A lock () or https:// means youve safely connected to the .gov website. Aquifers play a major role in providing water to many parts of Texas. Elsewhere, water from the Trinity Aquifer is used primarily for municipal and domestic supply. Nearly 100 groundwater conservation districts work across the state to preserve Texas aquifers and their groundwater levels. These data delineate the areal extent of the alluvial and glacial aquifers as defined in The Ground Water Atlas of The United States. Aquifers with this characteristic are common, although not exclusive, east and south of Interstate Highway 35. Aquifers play a major role in providing water to many parts of Texas. Major Aquifers of Texas [Map] Author: Texas Water Development Board (TWDB) Year: 2006: Document Number: 1295: HCP EIS Reference: . Five GCD's (Red on the map), the GMA12, are required to work together to set these conditions for the Carrizo-Wilcox Aquifer. In 2019, more than 90 percent of the water pumped from the Ogallala was used for irrigation, while more than 90 percent of the Hueco-Mesilla pumpage served municipal purposes. The San Antonio River Authority also has a number of flood-control structures that effectively recharge the aquifer. This aquifer underlies the Edwards Plateau, extending through 40 counties from the Hill Country of Central Texas westward to the Trans-Pecos region. A poorly defined groundwater divide in Hays County hydrologically separates the aquifer into the San Antonio and Austin regions. About 55 percent of all water used in Texas was sourced through aquifers in 2019. However, some individual aquifers serve mostly municipal purposes. For an overview ofprincipalaquifers:The principal water-yielding aquifers of North America can be grouped into five types by rock type and location: unconsolidated and semiconsolidated sand and gravel aquifers, sandstone aquifers, carbonate-rock aquifers, aquifers in interbedded sandstone and carbonate rocks, and aquifers in igneous and metamorphic rocks. San Antonio The competition for ground water from the Edwards aquifer has created some controversial water issues in central Texas. There are nine major aquifers and 22 minor aquifers that supply groundwater for municipal and irrigation needs throughout the state. However, because these aquifers extend over large areas, large volumes of water can be withdrawn. These declines are primarily attributed to municipal pumping, but they have slowed over the past decade as a result of increasing reliance on surface water. Larry French, director of the groundwater division at the Texas Water Development Board, spoke to Texas Standard about its potential . This list of national principal aquifer codes and names are fixed values assigned by the National Water Information System (NWIS). The Hickory aquifer occurs in parts of 19 counties in the Llano Uplift region of Central Texas. Edwards Aquifer Map Viewer. Their combined freshwater saturated thickness averages about 600 feet in North Texas and about 1,900 feet in Central Texas. Adopt the TX Town or County of your choice and share your message with the world. In scattered places in the United States, carbonate rocks are interbedded with almost equal amounts of water-yielding sandstone. (Note that the National Aquifer Code uses a different numeric component than the geohydrologic unit names.). The aquifer system is composed of the Catahoula, Oakville, Fleming, Goliad, Willis, Lissie, Bentley, Montgomery, and Beaumont formations. In Texas, the Panhandle is the most extensive region irrigated with groundwater. 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. The Catahoula Aquifer is considered an Alternative Water Source (AWS) in Montgomery County. There are 13 major and 20 minor aquifers; in the Hill Country, the major aquifers are the Edwards and the three water-producing zones of the Trinity. Guadalupe runs dry with rainfall scarce. Groundwater in the unconfined area is hard and typically has total dissolved solids concentrations less than 1,000 milligrams per liter. Click any position on the map to reveal attributes for a specific location. Edwards (Balcones Fault Zone) (San Antonio-oriented) The recharge zone of the aquifer in Burnet County is approximately 18,011 acres. Freshwater saturated thickness averages 95 feet. For the area tool click points on the map to begin building the polygon you want to measure and then double click to close the polygon. For the distance tool click points on the map to build line segments to measure and double click to complete the measurement. (.pdf file). The quality of groundwater used for public supply was assessed in 25 principal aquifers (PAs) that account for 84% of groundwater pumped for public supply in the U.S. (89.6 million people on a proportional basis). The Ogallala Formation of late Miocene to early Pliocene age consists of heterogeneous sequen-ces of coarse-grained sand and gravel in the lower part, grading upward into clay, silt, and fine sand. Aquifers are identified by a geohydrologic unit code - a three-digit number related to the age of the formation, followed by a 4 or 5 character abbreviation for the geologic unit or aquifer name. 1700 North Congress Avenue, Austin, TX 78701 TEL: 512-463-7847 / FAX: 512-475-2053. In 2019, more than 4.4 million acre-feet were pumped from the Ogallala Aquifer, accounting for 67 percent of the water sourced from all major Texas aquifers. The first publication of the core of the national aquifer list in a comprehensive manner was theGround Water Atlas of the United States(USGS Hydrologic Atlas 730, published in 2000) published as part of the National Atlas in 1998, revised 2003. For the area tool click points on the map to begin building the polygon you want to measure and then double click to close the polygon. About 32 percent of water used to meet municipal demands is from groundwater. Individual accumulations vary greatly in thickness, but most of the Seymour is less than 100 feet. U.S. Geological Survey 505 Ferguson Lane Austin, Texas 78754-4501 The Edwards and Trinity aquifers are classified as major aquifers by the Texas Water Development Board and are major sources of water in south-central Texas, where Hays County is located. Semiconsolidated aquifers consist of semiconsolidated sand interbedded with silt, clay, and minor carbonate rocks Sandstone aquifers are more widespread than those in all other kinds of consolidated rocks. Proceeds benefit education in TX. Throughout much of the aquifer, groundwater withdrawals exceed the amount of recharge, and water levels have declined fairly consistently through time. To learn more, visit theNational Aquifer Code Reference List. The U.S. Geological Survey prepared this dataset in cooperation with the Harris-Galveston Subsidence District, City of Houston, Fort Bend Subsidence District, Lone Star Groundwater Conservation District, and Brazoria County Groun The information was collected by the U.S. Geological Survey and other agencies during the course of many years of study. Geology, Major and Minor Aquifers, BRACS Study Areas, Regional Water Planning Areas, Groundwater Management Areas, Groundwater Conservation Districts, River Basins, Counties, 7.5' United State Geological Survey Grid, 2.5' State Grid, Latitude, Longitude, and Land Elevation. This dataset, published in 2003, contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands, portrayed as polygons. Water levels in the Trinity Aquifer, the county's main source of groundwater, plunged. Results of the Regional A, 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands), Unconsolidated and semiconsolidated sand and gravel aquifers, Regional Groundwater Availability Studies, North and South Carolina Atlantic Coastal Plain, Pennsylvanian and Mississippian Aquifers of the Appalachian Plateaus, Groundwater, Aquifers, Wells, and Springs, Minor aquifers, confining units, and areas identified as "not a principal aquifer", Quality of groundwater used for public supply in the continental United States: A comprehensive assessment, Principal aquifers [of the United States]. Water to the north of the Canadian River is generally fresh, with total dissolved solids typically less than 400 milligrams per liter. Water-conservation measures by agricultural and municipal users are being promoted. Because of the scar-city of measurable water-table wells, depth to the water table below land surface was estimated using However, water quality diminishes to the south, where large areas contain total dissolved solids in excess of 1,000 milligrams per liter. Some of the state's largest water level declines, ranging from 350 to more than 1,000 feet, have occurred in counties along the IH-35 corridor from McLennan County to Grayson County. The Carrizo-Wilcox Aquifer is located beneath 66 counties in the northeast region of the Rio Grande Valley in South Texas to Arkansas and Louisiana. See more information on Water Issues and the Texas economy. Freshwater saturated thickness averages 95 feet. Their combined freshwater saturated thickness averages about 600 feet in North Texas and about 1,900 feet in Central Texas. Source ( AWS ) in Montgomery County structures that effectively recharge the into... To aid researchers and students of Texas history the first 62 editions of the division! 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