Floridan Aquifer
Encyclopedia
Artesian aquifer
An artesian aquifer is a confined aquifer containing groundwater under positive pressure. This causes the water level in a well to rise to a point where hydrostatic equilibrium has been reached. This type of well is called an artesian well...
that extends into Florida
Florida
Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...
and is composed of carbonate
Carbonate
In chemistry, a carbonate is a salt of carbonic acid, characterized by the presence of the carbonate ion, . The name may also mean an ester of carbonic acid, an organic compound containing the carbonate group C2....
rock and located beneath the coastal regions of the Southeastern United States
Southeastern United States
The Southeastern United States, colloquially referred to as the Southeast, is the eastern portion of the Southern United States. It is one of the most populous regions in the United States of America....
and is one of the world's most productive aquifers. It is under all of Florida as well as large parts of coastal Georgia
Georgia (U.S. state)
Georgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...
and areas of coastal Alabama
Alabama
Alabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
and South Carolina
South Carolina
South Carolina is a state in the Deep South of the United States that borders Georgia to the south, North Carolina to the north, and the Atlantic Ocean to the east. Originally part of the Province of Carolina, the Province of South Carolina was one of the 13 colonies that declared independence...
. (See figure)
History
In 1936, geologistGeologist
A geologist is a scientist who studies the solid and liquid matter that constitutes the Earth as well as the processes and history that has shaped it. Geologists usually engage in studying geology. Geologists, studying more of an applied science than a theoretical one, must approach Geology using...
Victor Timothy Stringfield first identified the existence of Floridan Aquifer in peninsular Florida and referred to the carbonate units as the "principal artesian formations." In 1944, M. A. Warren of the Georgia Geological Survey described an extension of this system in south Georgia and applied the term "principal artesian aquifer" to the carbonate units involved. In 1953 and 1966 Stringfield also applied the term "principal artesian aquifer" to these rocks. In 1955, Garald G. Parker
Garald G. Parker
Garald G. "Jerry" Parker, Sr. was a hydrologist and is known as the "Father of Florida groundwater hydrology." Parker also named the principal artesian aquifer the Floridan Aquifer.- Education :...
noted the hydrologic and lithologic
Lithology
The lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples or with low magnification microscopy, such as colour, texture, grain size, or composition. It may be either a detailed description of these characteristics or be a summary of...
similarities of the Tertiary
Tertiary
The Tertiary is a deprecated term for a geologic period 65 million to 2.6 million years ago. The Tertiary covered the time span between the superseded Secondary period and the Quaternary...
carbonate formations in southeast Florida, concluded that they represented a single hydrologic unit, and named that unit the "Floridan aquifer."
Location
The Floridan aquifer, as opposed to surficial aquiferSurficial aquifer
Surficial aquifers are shallow aquifers typically less than 50 feet , but thicknesses of about have been mapped.- Composition :Surficial aquifers system consists mostly of beds of unconsolidated sand, cavity-riddled limestone and shells, sandstone, sand, and clay sand with minor clay or silt from...
s, is the portion of the principal artesian aquifer that extends into Florida
Florida
Florida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...
, parts of southern Alabama
Alabama
Alabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
, southeastern Georgia
Georgia (U.S. state)
Georgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...
, and southern South Carolina
South Carolina
South Carolina is a state in the Deep South of the United States that borders Georgia to the south, North Carolina to the north, and the Atlantic Ocean to the east. Originally part of the Province of Carolina, the Province of South Carolina was one of the 13 colonies that declared independence...
. In Florida it supplies the cities of Daytona, Flagler Beach
Flagler Beach, Florida
Flagler Beach is a city in Flagler and Volusia counties in the U.S. state of Florida. The population was 4,954 at the 2000 census, with an estimated population of 5,228 in 2004.Flagler Beach is part of the Palm Coast Metropolitan Statistical Area...
, Gainesville
Gainesville, Florida
Gainesville is the largest city in, and the county seat of, Alachua County, Florida, United States as well as the principal city of the Gainesville, Florida Metropolitan Statistical Area . The preliminary 2010 Census population count for Gainesville is 124,354. Gainesville is home to the sixth...
, Tampa
Tampa, Florida
Tampa is a city in the U.S. state of Florida. It serves as the county seat for Hillsborough County. Tampa is located on the west coast of Florida. The population of Tampa in 2010 was 335,709....
, Jacksonville
Jacksonville, Florida
Jacksonville is the largest city in the U.S. state of Florida in terms of both population and land area, and the largest city by area in the contiguous United States. It is the county seat of Duval County, with which the city government consolidated in 1968...
, Ocala
Ocala, Florida
Ocala is a city in Marion County, Florida. As of 2007, the population recorded by the U.S. Census Bureau was 53,491. It is the county seat of Marion County, and the principal city of the Ocala, Florida Metropolitan Statistical Area, which had an estimated 2007 population of 324,857.-History:Ocala...
, Orlando
Orlando, Florida
Orlando is a city in the central region of the U.S. state of Florida. It is the county seat of Orange County, and the center of the Greater Orlando metropolitan area. According to the 2010 US Census, the city had a population of 238,300, making Orlando the 79th largest city in the United States...
, St. Petersburg
St. Petersburg, Florida
St. Petersburg is a city in Pinellas County, Florida, United States. It is known as a vacation destination for both American and foreign tourists. As of 2008, the population estimate by the U.S. Census Bureau is 245,314, making St...
, and Tallahassee
Tallahassee, Florida
Tallahassee is the capital of the U.S. state of Florida. It is the county seat and only incorporated municipality in Leon County, and is the 128th largest city in the United States. Tallahassee became the capital of Florida, then the Florida Territory, in 1824. In 2010, the population recorded by...
, several municipalities in South Florida, and numerous rural communities.
Hydrology
The principal artesian aquifer is the largest, oldest, and deepest aquifer in the southeastern U.S. Ranging over 100000 mi2, it underlies all of Florida and The Floridan portion developed millions of years ago during the late PaleocenePaleocene
The Paleocene or Palaeocene, the "early recent", is a geologic epoch that lasted from about . It is the first epoch of the Palaeogene Period in the modern Cenozoic Era...
to early Miocene
Miocene
The Miocene is a geological epoch of the Neogene Period and extends from about . The Miocene was named by Sir Charles Lyell. Its name comes from the Greek words and and means "less recent" because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene...
periods, when Florida was underwater. Wakulla Springs
Wakulla Springs
Wakulla Springs is located south of Tallahassee, Florida and east of Crawfordville in Wakulla County, Florida at the crossroads of State Road 61 and State Road 267...
in Wakulla County
Wakulla County, Florida
Wakulla County is a county located in the U.S. state of Florida. As of 2000, the population was 22,863. The U.S. Census Bureau 2005 estimate for the county was 28,212 people...
, Florida is one of a number of major outflows of the Floridan with a flow rate of 200–300 million US gallons (757,082 - 1,135,623 cubic meters) of water a day. A record peak flow from the spring on April 11, 1973 was measured at 14324 gallons (54,222.2 l) per second - equal to 1.2 billion gallons (4,542,494 cubic meters) per day.
In general, as the water flows through the Florida aquifer systems it matures. The water quality becomes more alkaline and the sulfate
Sulfate
In inorganic chemistry, a sulfate is a salt of sulfuric acid.-Chemical properties:...
content increases as does the amount of dissolved solids.