The Biscayne Aquifer, named after

Biscayne Bay Biscayne Bay () is a lagoon with characteristics of an estuary located on the Atlantic coast of South Florida. The northern end of the lagoon is surrounded by the densely developed heart of the Miami metropolitan area while the southern end is la ...

, is a

surficial aquifer Surficial aquifers are shallow aquifers typically less than thick, but larger surficial aquifers of about have been mapped. They mostly consist of unconsolidated sand enclosed by layers of limestone, sandstone or clay and the water is commonly ...

. It is a shallow layer of highly

permeable Permeability, permeable, and semipermeable may refer to: Chemistry *Semipermeable membrane, a membrane which will allow certain molecules or ions to pass through it by diffusion *Vascular permeability, the movement of fluids and molecules betwe ...

limestone Limestone ( calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms w ...

under a portion of South

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and ...

. The area it underlies includes

Broward County Broward County ( , ) is a county in the southeastern part of Florida, located in the Miami metropolitan area. It is Florida's second-most populous county after Miami-Dade County and the 17th-most populous in the United States, with over 1.94 m ...

Miami-Dade County Miami-Dade County is a county located in the southeastern part of the U.S. state of Florida. The county had a population of 2,701,767 as of the 2020 census, making it the most populous county in Florida and the seventh-most populous county in ...

Monroe County Monroe County may refer to seventeen counties in the United States, all named for James Monroe: *Monroe County, Alabama * Monroe County, Arkansas * Monroe County, Florida *Monroe County, Georgia * Monroe County, Illinois * Monroe County, Indi ...

, and

Palm Beach County Palm Beach County is a county located in the southeastern part of Florida and lies directly north of Broward County and Miami-Dade County. The county had a population of 1,492,191 as of the 2020 census, making it the third-most populous county ...

, a total of about .

Description

The water-absorbing layers of rock underlying south Florida divide into three layers. The Biscayne Aquifer is closest to the surface and because of this it directly interacts with natural and man-made bodies of surface water, such as streams, lakes, canals and reservoirs. The ground water and the aquifer currently are managed as an integrated water system. Because the top part of the Biscayne

aquifer An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials ( gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characte ...

is the water table, this aquifer is known as an

unconfined aquifer An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characterist ...

. Since it merges with the floor of

and with the

Atlantic Ocean The Atlantic Ocean is the second-largest of the world's five oceans, with an area of about . It covers approximately 20% of Earth's surface and about 29% of its water surface area. It is known to separate the " Old World" of Africa, Europe ...

, it is also a coastal aquifer. Both of these factors contribute to its potential contamination. Lowered water tables, primarily from over-pumping, could allow

salt water Saline water (more commonly known as salt water) is water that contains a high concentration of dissolved salts (mainly sodium chloride). On the United States Geological Survey (USGS) salinity scale, saline water is saltier than brackish w ...

intrusion without man-made interventions such as dam-like structures that control fresh and salt water levels in canals. Because the aquifer is so close to the surface, it is extremely vulnerable to surface contaminants. A massive saltwater plume is radiating from the Turkey Point Nuclear Generating Station toward wellfields in the aquifer.

Management

The South Florida Water Management District controls an extensive system of

canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface f ...

s and other control systems and

pumping station Pumping stations, also called pumphouses in situations such as drilled wells and drinking water, are facilities containing pumps and equipment for pumping fluids from one place to another. They are used for a variety of infrastructure system ...

s along with the Biscayne Aquifer,

Lake Okeechobee Lake Okeechobee (), also known as Florida's Inland Sea, is the largest freshwater lake in the U.S. state of Florida. It is the tenth largest natural freshwater lake among the 50 states of the United States and the second-largest natural freshwa ...

and three other large water conservation areas as it monitors and controls the storage and release of the water in the district. It must take into account the danger of salt water intrusion and monitor water demand while it manages surplus flood water and maintains water table levels and adequate water supplies. The Biscayne Aquifer supplies

South Florida metropolitan area The Miami metropolitan area (also known as Greater Miami, the Tri-County Area, South Florida, or the Gold Coast) is the ninth largest metropolitan statistical area in the United States and the 34th largest metropolitan area in the world with a ...

with its primary source of fresh water. This area includes most of south Florida (Miami-Dade, Monroe, and parts of Broward Counties) as well was other urban areas stretching from

Homestead, Florida Homestead is a city within Miami-Dade County in the U.S. state of Florida, between Biscayne National Park to the east and Everglades National Park to the west. The population was 80,737 as of the 2020 census. Homestead is primarily a Miami s ...

Delray Beach, Florida Delray Beach is a city in Palm Beach County, Florida, United States. The population of Delray Beach as of April 1, 2020 was 66,846 according to the 2020 United States Census. Located 52 miles (83 kilometers) north of Miami, Delray Beach is in the ...

. Further, water from the Biscayne Aquifer is piped to the

Florida Keys The Florida Keys are a coral cay archipelago located off the southern coast of Florida, forming the southernmost part of the continental United States. They begin at the southeastern coast of the Florida peninsula, about south of Miami, and e ...

Footnotes

External links

Description of Biscayne Aquifer
Aquifers in the United States Hydrology Geologic formations of the United States Geology of Florida {{watersupply-stub