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Not to be confused with Barton Springs Pool, a recreational swimming pool, part of Barton Springs. Barton Springs Main Barton Spring, inside Barton Springs Pool Type Karst spring Location Austin, Texas, U.S.A Source Edwards Aquifer Provides water for Barton Creek and Colorado River Flow 66 ft³/s (1869 L/s) Magnitude 2 Elevation 435 ft (133 m) above sea level Barton Springs is a set of four natural water springs located on the grounds of Zilker Park[1] in Austin, Texas resulting from water flowing through the Edwards Aquifer. The largest spring, Main Barton Spring (also known as Parthenia, "the mother spring") supplies water to Barton Springs Pool, a popular recreational destination in Austin. The smaller springs are located nearby, two with man-made structures built to contain and direct their flow. The springs are the only known habitat of the Barton Springs Salamander, an endangered species. Contents 1 Geology 2 Main Barton Spring 3 Other springs 4 Natural history 5 See also 6 References 7 Notes 8 External links Geology Barton Springs is the main discharge point for the Barton Springs segment of the Edwards Aquifer of Texas, a well known karst aquifer. Geologically, the aquifer is composed of limestone from the Cretaceous period, about 100 million years old. Fractures, fissures, conduits, and caves have developed in this limestone. Both physical forces, such as faulting, and chemical forces, such as dissolution of limestone by infiltrating water, have enlarged these voids. This results in a karst aquifer made up of limestone with large void spaces. Water then enters the aquifer and fills the voids. All water discharging from Barton Springs originates as rainfall. Some of this rain falls directly onto the area of land where the aquifer limestone rock is exposed, which is known as the recharge zone. Other rainfall enters into creeks that cross the recharge zone, and infiltrates the limestone bedrock. After water enters the aquifer, it flows along the gradients created by differences in hydraulic pressure into the area of lowest hydraulic pressure. This lowest point of hydraulic pressure is Barton Springs. Main Barton Spring Main Barton Spring/Parthenia is the most famous, yet least visible of the four springs as it is completely submerged by pool water. Located near the diving board in Barton Springs Pool, the spring's flow is not always visible at the surface. The main spring discharges an average flow of about 31 million US gallons per day (1 m³/s). The lowest discharge ever recorded was 9 million gallons per day (0.4 m³/s) during the drought of the 1950s, and the highest discharge ever recorded was 85 million gallons per day (3.7 m³/s) during the December 1991 floods. By comparison, a typical domestic swimming pool holds about 50,000 US gallons (200 m³), and the City of Austin, a city of about 775,000 residents, uses about 220 million US gallons per day for its public water supply system. Other springs Eliza Spring in 2005. The three other springs associated with Barton Springs are Eliza, Old Mill, and Upper Barton Spring. Each is significantly smaller than Main Barton Spring, discharging an average of 3 million US gallons per day (0.1 m³/s). Sometimes, these springs dry up completely. Eliza Spring, also known as Concession Spring, is located on the northwestern side of Barton Springs Pool behind the concession stand. During the early 20th century, an amphitheater-style swimming enclosure was built around the spring. This structure is no longer open to the public due to safety concerns, and the fact that Eliza Spring has become a sensitive habitat area for the endangered Barton Springs Salamander. Old Mill Spring, also known as Sunken Gardens Spring or Zenobia Spring, is located on the northeastern side of Barton Springs Pool. Like Eliza Spring, the early 20th century structure built around the spring is now closed to public access due to safety and endangered species habitat issues. Scientific analysis show that the water at Old Mill Spring has a slightly different chemistry than that of Main Barton Spring and Eliza Spring, even though it is less than half a mile (800 m) away from these springs. Upper Barton Spring is located in the creek bed of Barton Creek, about a half mile (800 m) upstream of Barton Springs Pool. Frequently dry, Upper Barton Spring is fully submerged by Barton Creek during floods. The water at Upper Barton Spring also has a significantly different chemistry than the other springs. The entire area around Barton Springs is riddled with faults from the Balcones Fault Zone and features other, smaller springs. For example, about one mile (2 km) upstream of Upper Barton Spring, an intermittent spring fills a popular natural swimming hole. Several other small springs empty directly into the Barton Creek bypass tunnel that passes to the side of Barton Springs Pool. Natural history The Balcones Fault Zone at Barton Springs is a demarcation line for certain ecological systems and species distributions. For example, the California Fan Palm, Washingtonia filifera is distributed strictly west of Barton Springs or the Balcones Fault.[2] See also Austin portal Zilker Park Edwards Aquifer Barton Creek Barton Springs Salamander References Gregg Eckhardt. 2009. Edwards Aquifer: Barton Springs C. Michael Hogan. 2009. California Fan Palm: Washingtonia filifera, GlobalTwitcher.com, ed. Nicklas Stromberg Notes ^ Gregg Eckhardt. 2009 ^ C. Michael Hogan. 2009 External links Real-time Barton Springs data from USGS Save Our Springs Alliance Barton Springs/Edwards Aquifer Conservation District Barton Springs from the Handbook of Texas Online Barton Springs is at coordinates 30°15′50″N 97°46′12″W / 30.26390°N 97.77000°W / 30.26390; -97.77000 (Barton Springs)Coordinates: 30°15′50″N 97°46′12″W / 30.26390°N 97.77000°W / 30.26390; -97.77000 (Barton Springs) v · d · eCity of Austin History · Metro Area Counties Hays · Travis · Williamson Important businesses Advanced Technology Development Facility (ATDF) · Alamo Drafthouse Cinema · Austin Zoo · Dell · Driskill Hotel · Four Seasons Hotel Austin · Freescale Semiconductor · Fuddruckers  · Inner Sanctum Records · MCC · National Instruments · SEMATECH · Waterloo Records · Whole Foods Market Higher education Austin Community College · Huston-Tillotson University · St. Edward's University · University of Texas Music Antone's · Armadillo World Headquarters · Austin City Limits · Austin Lyric Opera · Austin Symphony Orchestra · Emo's · SXSW · Stevie Ray Vaughan · Willie Nelson Landmarks Austin-Bergstrom International Airport · Darrell K Royal-Texas Memorial Stadium · Dell Diamond · The Drag · Frank Erwin Center · Governor's Mansion · Lyndon Baines Johnson Library and Museum · Moonlight tower · Sixth Street · State Capitol · Treaty Oak · UFCU Disch-Falk Field · University of Texas Tower Parks and preserves Auditorium Shores · Emma Long · Hippie Hollow · McKinney Falls · Mount Bonnell · Walnut Creek · Wild Basin · Zilker Bodies of water Barton Creek · Barton Springs · Colorado River · Deep Eddy Pool · Lady Bird Lake · Lake Austin · Lake Travis · Lake Walter E. 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