St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District St. Johns River Water Management District
St. Johns River Water Management District - www.sjrwmd.com

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Water bodies, watersheds and storm water

Anatomy of a spring

A spring is “a point of focused discharge of groundwater” — it is an area on the earth’s surface where groundwater discharges to become surface water.

Some springs are large enough to create a spring-run stream, which is a distinct river system fed by the flow of the spring. Some spring-run streams in the district include Silver River, Alexander Spring Creek and Wekiva River. Other springs (such as Blue Spring, Welaka Spring, Green Cove Spring) contribute to the flow of the St. Johns River and other large rivers.

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Spring pool
Spring pool

A small body of water, either artificially impounded or naturally occurring, that encompasses one or more spring vents.

St. Johns River Water Management District
Spring boil

A discharge from a spring in which water pressure is great enough to cause a turbulent discharge (the “mound” or “upwelling” of water over the spring vent).

St. Johns River Water Management District
Spring vent

An opening that concentrates groundwater discharge at the earth’s surface, including the bottom of the ocean.

Spring cave
Cave

A natural underground opening or series of openings and passages large enough to be entered by an adult person.

Limestone matrix
Limestone matrix

The layers of limestone (sedimentary rock) underground form the “container” for the water that constitutes the Floridan aquifer. This circulation of water in the main aquifer feeds many of Florida’s springs.

Spring run
Spring run

A body of flowing water that originates from a karst (porous limestone) spring and whose primary source of water (greater than 50%) is from the spring.

Spring run habitat
Spring run habitats

Important habitats (living and feeding space for aquatic fauna) in spring runs include beds of submerged aquatic vegetation (also known as SAV) and submerged trees (known as snags). These provide shelter and feeding areas for many species of invertebrates, fish, turtles, birds and mammals.

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St. Johns River Water Management District
4049 Reid Street, Palatka, FL 32177
(800) 725-5922