Hydrological Data Concerning Submarine Groundwater Discharge Along the Western Margin of Indian River Lagoon, East-Central Florida-December 2016 and January 2017

Stretching along approximately 200 kilometers (km) of the Atlantic Coast of central Florida, Indian River Lagoon is one of the most biologically diverse estuarine systems in the continental United States. This shallow, brackish lagoon varies in width from about 0.5–9.0 km, with substantial human infrastructure lining both shores. Scientists from the U. S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center used continuous resistivity profiling (CRP), a towed electronic array, to investigate submarine groundwater discharge at Eau Gallie North, a study site located along the western shore of the central section of Indian River Lagoon. The CRP array was towed behind a boat along five shore-parallel transects located between 125-750 meters (m) offshore and traversing ~ 1.5 km along north-south transects. Additional, subsequent resistivity surveys will be conducted along these same tracklines, at various times to determine temporal variability. Since resistivity is a function of both geology and salinity, it is assumed that temporal shifts will reflect salinity changes, as the underlying geology will be presumed to remain constant.