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Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

Subsurface Characterization of Selected Water Bodies in the St Johns River Water Management District, Northeast Florida

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North East Florida Atlas
About the Atlas:
Introduction
Methods
Regional Geology
Karst Development & Characterization
Sinkhole Lake Evolution & Effect of Urbanization
Identification of Karst Features from Seismic Patterns
Summary You are at the Summary section of the NE Florida Atlas
Acknowledgements
References
Printable Version of the Atlas
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About the Atlas

Summary

This atlas is the product of an investigation of lakes and rivers in north central Florida, a cooperative effort by the St. Johns River Water Management District and the U.S. Geological Survey. The objectives of the study were to: 1.) identify evidence of breaches or discontinuities of the confining units between surficial water bodies and the Floridan aquifer, and; 2.) identify diagnostic features, structure and geomorphology of the lakes and rivers within the region.

The shallow subsurface of north central Florida is characterized as a mature karst (limestone) overlain by an overburden of clays, silts and sands that act as an impermeable layer between surficial waters and the Floridan aquifer. Breaches through this layer allow recharge or discharge of waters to or from the Floridan aquifer. The development of breaches are influenced by various physical parameters, including the thickness and lithologic composition of the overburden, the maturity of karst development and depth to the potentiometric surface of the aquifer. Knowledge of these parameters and identifying the location and magnitude of the breaches is important in understanding the interaction between the surface waters and the aquifer.

Coastal & Marine Geology Program > Center for Coastal & Regional Marine Studies > Geologic Characterization of Lakes and Rivers of Northeast Florida > OFR 00-180

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Updated December 02, 2016 @ 11:25 AM (JSS)