Groundwater Assessment Program

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Groundwater Assessment Program (GAP)

Marlon Cook, Director

Groundwater Assessment Program
›› Water Facts
›› GSAGAP Information

Research Program Elements
›› GSAGAP Current Research

Information Distribution
›› Real-time monitoring wells
›› Periodic monitoring wells
›› Scanned well records
›› Aquifer Recharge Areas of    Alabama

›› Selected water-related    publications by county
›› GSA on-line reports
›› Open-file Reports


Geological Survey of Alabama Groundwater Assessment Program

As Groundwater Trustee for Alabama, State Geologist Berry H. (Nick) Tew directs the Geological Survey of Alabama (GSA), which has a long history of water-resource data collection and research.  Currently, the Groundwater Assessment Program (GAP) conducts GSA water resource investigations, including groundwater and surface-water assessments.  The GSAGAP is a repository for water well data, with information on more than 125,000 wells, dating back to the early 1900s.  A groundwater monitoring program is also maintained by the GAP that began in the early 1950s and tracks groundwater levels for more than 400 wells.  The GSA published its first water resource report in 1904 and now has more than 200 published and open-file reports. 

Ground-water monitoring

The GSAGAP operates and maintains 23 real time groundwater level monitoring stations in wells and springs, in various aquifers across the state.  These wells and springs are equipped with the latest digital data collection and transmission technology that records groundwater levels every 30 minutes, stores, and transmits daily to the GSAGAP offices, where the data are automatically posted on hydrographs, that are available, along with data interpretations, on the GSAGAP website.  The system will be constantly expanded with the establishment of new monitoring stations.

Continuous monitoring wells are also operated and maintained by the GSAGAP.  These wells are equipped with a digital recorder which records the water level in the well every 2 hours and stores the data in a data logger. The data are retrieved on a routine basis.  These continuous records provide insight into how ground-water levels fluctuate in response to weather and ground-water withdrawals. Records from some of these wells date back to 1952 and provide excellent long-term trend information.

On a periodic basis, normally during October, approximately 400 wells and springs are monitored for water levels and spring discharges. This information provides a snapshot of fluctuating water levels that indicate impacts from climate and water production. Most of the periodic monitoring wells have a period of records of more than 30 years, and reflect changing aquifer conditions in the state.

Information requests

Local, state, and federal government, water supply systems, consultants, drillers, and private citizens are invited to call our office for assistance with any water-related questions they might have. We have extensive water information resources and will be happy to answer your questions.



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