Groundwater Conditions of Georgia

Aquifer characteristics: Water levels in 16 wells were used to define conditions in the Brunswick aquifer system. The aquifer system consists of the confined (water is under pressure by overlying sediments) upper and lower Brunswick aquifers and equivalent low-permeability sediments to the north and west in southeastern Georgia. Water-level fluctuations reflect changes in local pumping, interaquifer-leakage effects, and recharge. During 2015, 3.10 million gallons per day (Mgal/d) were withdrawn from the Brunswick aquifer in Georgia, primarily for public supply and irrigation (Painter, 2019).

Well Locations with Ten Year Trend Icons

   Arrow icons represent upward or downward water-level trend. Water-level trend calculations based on last 10 years of data.
   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.
   Split color icons represent wells with graphs.
   Light blue square indicates nearby precipitation gage.
   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 water levels for the Brunswick aquifer 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 feet per year (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. The water level in well 33D071 in Camden County increased from around 9 feet below land surface to 7 feet above land surface during 2002/2003 due to reduced pumping.

Below the table and composite graphs are trend analysis graphs for three selected wells. The trend analyses show mostly seasonal variations, with periodic upward or downward trends that respectively reflect surpluses or deficits in rainfall. 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 surface	Monthly mean water levels in feet below land surface
31U009	xxxx	xxxx
34H437	xxxx	xxxx
32L016	xxxx	xxxx

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	Water-bearing Unit1	POR First Month/Year	POR slope (ft/yr)	Ten Year slope (ft/yr)
36N012	Bryan	L	xx	xx	yy
31U009	Bulloch	UX	xx	xx	yy
32G047	Camden	U	xx	xx	yy
33D071	Camden	U	xx	xx	yy
38Q209	Chatham	B	xx	xx	yy
39Q026	Chatham	UX	xx	xx	yy
34S008	Effingham	LX	xx	xx	yy
35S008	Effingham	LX	xx	xx	yy
33J062	Glynn	L	xx	xx	yy
33J065	Glynn	U	xx	xx	yy
34H437	Glynn	U	xx	xx	yy
34J077	Glynn	U	xx	xx	yy
34K104	McIntosh	L	xx	xx	yy
32L016	Wayne	U	xx	xx	yy

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¹L, lower Brunswick aquifer; UX, undifferentiated, low-permeability equivalent to the upper Brunswick aquifer; U, upper Brunswick aquifer; B, Brunswick aquifer system; LX, undifferentiated, low-permeability equivalent to the lower Brunswick aquifer. Slope of 0.00 represents no trend.