Cretaceous Aquifer - Augusta/Richmond County
Aquifer characteristics: Water levels in six wells in the Cretaceous aquifer system were used to define groundwater conditions in the Augusta/Richmond County area, in eastern Georgia. In this area water in the Cretaceous aquifer system mostly is confined (under pressure by overlying sediments) but can be unconfined (in contact with the atmosphere) in stream valleys or the outcrop area in central and northern parts of the county near the fall line which is the southern boundary of the Piedmont. Hydrographs mostly show periodic upward or downward trends in the central and southern part of the county that largely reflect changes in pumping and long-term, multi-year wet and dry periods. Hydrographs in the northern part of the county strongly respond to rainfall with a secondary response to pumping. The brief responses to rainfall events may not be apparent in the monthly mean data.
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), and/or less than 100 monthly-mean water levels from the last 10 years of data.
Split color icons represent wells with graphs.
Light blue square indicates nearby precipitation gage.
(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 six Cretaceous-aquifer wells monitored in the Augusta/Richmond County area. 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. The POR trend for three of the wells was negative and three was positive.
Below the table and composite graphs are trend analysis graphs for four selected 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.
2022 conditions for select wells: The POR mean of monthly water levels for well 30AA04 ranged from 127.7 to 129.0 ft below land surface. During 2022, monthly mean water levels ranged from 129.7 to 133.0 ft below land surface. POR mean of monthly water levels for well 29AA09 ranged from 69.1 to 70.0 ft below land surface. During 2022, monthly mean water levels ranged from 67.8 to 69.1 ft below land surface. POR mean of monthly water levels for well 30AA37 ranged from 40.4 to 43.5 ft below land surface. During 2022, monthly mean water levels ranged from 39.0 to 43.3 ft below land surface. POR mean of monthly water levels for well 30AA38 ranged from 36.3 to 37.2 ft below land surface. During 2022, monthly mean water levels ranged from 35.4 to 36.9 ft below land surface.
Period of Record (POR) and 2022 Summary Table
| Well | Period of Record | 2022 |
|---|---|---|
| Mean of monthly water levels in feet below land surface | Monthly mean water levels in feet below land surface | |
| 29AA09 | 69.1-70.0 | 67.8-69.1 |
| 30AA04 | 127.7-129.0 | 129.7-133.0 |
| 30AA37 | 40.4-43.5 | 39.0-43.3 |
| 30AA38 | 36.3-37.2 | 35.4-36.9 |
Period of Record (POR) and 2022 Summary Table and above text, updated June 2023. Monthly Mean Composite graph updated weekly, all other graphs and tables continuously updated.
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) |
|---|---|---|---|---|---|
| Richmond | Upper Midville | xx | xx | yy | |
| Richmond | Midville | xx | xx | yy | |
| Richmond | Lower Midville | xx | xx | yy | |
| Richmond | Dublin-Midville | xx | xx | yy | |
| Richmond | Midville | xx | xx | yy | |
| Richmond | Lower Dublin | 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.
(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.