Groundwater Assessment Program (GAP)
Marlon Cook, Director
Groundwater level records
Real-time Monitoring Wells
The Geological Survey of Alabama Groundwater Assessment Program (GSAGAP) Real-Time Groundwater-Level Monitoring System is composed of twenty-one wells, constructed in strategic locations at varying depths in both semi-confined and confined aquifers. The wells are equipped with automatic digital recording equipment and a telemetry interface system, which transmits data by cellular signal directly to the GAP offices where it is uploaded graphically to the GAP website daily.
Long-term hydrographs from monitoring wells provide an indicator of water level fluctuation affected by groundwater withdrawals, land use, and climatic changes. The period of record for some of the wells continuously monitored by the GSA is longer than 60 years, providing excellent data trend analysis. The response of groundwater levels to meteorological drought is generally slower than other drought indicators, such as soil moisture and stream flow, and can provide information related to drought intensity and duration. Percentiles are included with the real-time hydrographs to allow comparison of recent water levels with levels collected during the period of record.