Upper Floridan: City of Brunswick/Glynn County

Aquifer characteristics: Water levels in seven wells were used to define groundwater conditions in the Upper Floridan aquifer near the city of Brunswick in the southern coastal area of Georgia. In this area, water in the Upper Floridan aquifer is confined (under pressure from overlying sediments), and groundwater flow paths are influenced primarily by pumping for industrial and public supply (Cherry and others, 2011).

Well Locations with Ten Year Trend Icons

up arrow icon down arrow icon    Arrow icons represent upward or downward water-level trend. Water-level trend calculations based on last 10 years of data.
dot icon    Circle icon represents slope of trend line with an absolute value that is less than 0.01 feet per year (ft/yr), based on last 10 years of data.
up arrow icon with graph down arrow icon with graph dot icon with graph    Split color icons represent wells with graphs.
square light blue precip gage icon    Light blue square indicates nearby precipitation gage.
diamond icon    Diamond icon represents less than 100 monthly-mean water levels from the last 10 years of data.
(Click or hover over map icons for more information.)

Water-level Trends: The table below shows the period of record (POR) and most recent ten-year trends of monthly mean data points for the seven wells. The data used in the trend analyses are pulled from the USGS National Water Information System: Web Interface (NWISweb), and the trends are calculated in ft/yr. The check boxes on the left side of the table allow the reader to compare only those wells of interest by selecting them on or off to appear on the Monthly Mean Composite Graph.

Below the table and composite graphs are trend analysis graphs for two wells. The trend analyses show mostly long-term effects of pumping. A simple regression line may be placed on the graph by selecting the Simple Regression button, and the slope of the line is calculated. To clear the regression line, select the Clear Regression Line button. Like the composite graph, the user can click and drag the mouse vertically or horizontally to change the scale and zoom in to the time-period of interest. Any changes to the time scale will require the user to clear and recreate a regression line for the new time scale. Double click on the graph and it will return to the period of record.

Period of Record (POR) and Previous Calendar Year Summary Table
Well Period of Record Previous Calendar Year
Mean of monthly water levels in feet below land surfaceMonthly mean water levels in feet below land surface
33H133xxxxxxxx
34H371xxxxxxxx

Period of Record (POR) and Previous Calendar Year Table, updated weekly. Monthly Mean Composite graph updated weekly, all other graphs and tables continuously updated. Negative depths to water indicate water level in feet above land surface.

Slope of trend line for Period of Record (POR) and previous Ten Years
Station Name
Data Link
County
POR First
Month/Year
POR slope
(ft/yr)
Ten Year
slope (ft/yr)
Glynn xx xx yy
Glynn xx xx yy
Glynn xx xx yy
Glynn xx xx yy
Glynn xx xx yy
Glynn xx xx yy
Glynn xx xx yy

Slope of 0.00 represents no trend.

Monthly Mean Composite Graph

To change the graph scale, click and drag mouse vertically or horizontally.
To reset the graph scale, double click on the graph.
Blank where data are missing.

Monthly Mean Graph Values
(mouse over graph for date and depth)

Select Monthly Mean Data Graphs with Trend Analysis

To change the graph scale, click and drag mouse vertically or horizontally. To reset graph scale, double click on the graph. Blank where data are missing.

Station name: 33H133
County: Glynn
Number: 311007081301702

Slope (ft/yr):
Date (begin): Date (end): Data points:

Station name: 34H371
County: Glynn
Number: 310818081293701

Slope (ft/yr):
Date (begin): Date (end): Data points:

References