Crystalline Rock Aquifer
Water levels in six wells were measured in crystalline-rock aquifers in the Piedmont and Blue Ridge Physiographic Provinces of Georgia. In this area, water is present in discontinuous joints and fractures and may be confined or unconfined. In general, crystalline-rock aquifers are local in extent and can be greatly affected by localized water use and climate. During 2010, about 64 million gallons per day (Mgal/d) were withdrawn from the crystalline-rock aquifers in Georgia, primarily for public-supply withdrawals (Lawrence, 2016). Hydrographs for selected wells (below) illustrate monthly mean water levels for the period of record. The hydrographs show periodic upward or downward trends that reflect changes in precipitation and pumping.
Period of Record (POR) and Ten Year Trends
|Station Name||County||POR First
Well Locations with Ten Year Trend Icons
Arrow icons represent upward or downward water level trend. Calculations based on last 10 years of data.
Dot icon represents trend slope less than 0.01 ft/yr. or less than 100 data points from the last 10yrs. of data.
Split color icons represent wells with graphs.
(Click or hover over map icons for more information.)
Monthly Mean Data Graphs
To change the graph scale, click and drag mouse vertical or horizontal. To reset graph scale, double click on the graph.
Station name: 12JJ04
Station name: 10DD02
Station name: 11FF04
Station name: 16MM03
- Lawrence, S.J., 2016, Water use in Georgia by county for 2010 and water-use trends, 1985–2010 (ver. 1.1, January 2016): U.S. Geological Survey Open-File Report 2015–1230, 206 p., accessed August 24, 2016, at https://doi.org/10.3133/ofr20151230.