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The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
A plot of sugarcane yield versus depth of water table in Australia. The critical depth is 0.6 m. [4] [5] Most crops need a water table at a minimum depth. [6] For some important food and fiber crops a classification was made [7] because at shallower depths the crop suffers a yield decline. [8]
Located in South Central Texas, the Edwards Aquifer encompasses an area of approximately 4,350 square miles (11,300 km 2) that extends into parts of 11 counties. [3] The aquifer's boundaries begin at the groundwater divide in Kinney County, East of Brackettville, and extend Eastward through the San Antonio area and then Northeast where the aquifer boundary ends at the Leon River in Bell County ...
Recharge is the primary method through which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table surface. Groundwater recharge also encompasses water moving away from the water table farther into the saturated zone. [7]
The Mission–Aransas Estuary is the fifth largest of the Texas estuaries, with a surface area of 111,780 acres (45,240 ha) including Aransas Bay and its extensions in Redfish Bay to the southwest, Copano Bay to the northwest, and Saint Charles Bay to the north. The natural portions have an average depth of around 5.5 feet (1.7 m). [17]
Following is a list of dams and reservoirs in Texas. All major dams are linked below. The National Inventory of Dams defines any "major dam" as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m 3 ), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m 3 ).
According to annual depth to water level measurements obtained by the High Plains Underground Water District, the water table beneath the Llano Estacado has declined at a rate of 0.8 ft (0.2 m) per year over the last decade. Over the 20-year period from 1987 to 2007, the water table dropped a total of 18.6 ft (5.7 m) across the district. [8]
The Carrizo-Wilcox Aquifer is an aquifer in Texas, United States. [1]The aquifer supplies water to about 12 million homes in East Texas. [2]The aquifer's water quality is claimed to be at risk from leaks and spills from the Keystone XL tar sands pipeline by environmental organizations.