Where in Arizona are ground-water levels falling? Where are they stable or rising? How much has the water table changed since large-scale pumping has occurred? A new online system developed by the U.S. Geological Survey (USGS) is designed to answer these and other questions for the most developed ground-water areas in the State. The system uses water-level measurements from wells, collected over the past 75 years by USGS and the Arizona Department of Water Resources. Visit the new online system, called “Arizona Ground-Water Conditions Interactive Map Service.”
The new site provides basic information on the system, a link to the just-released Open-File Report explaining how the data layers were created, and a button to launch the interactive map. The map initially shows the entire state and selected features including boundaries of ground-water areas. Users can select specific types of ground-water information to display in a menu on the right. For example, “Trends in recent water levels” show where ground-water levels are generally declining, are nearly stable, or have been rising over the past 10 years. Tools are available to zoom in to specific areas of interest and to view well observation records.
Other layers of information available on the map include the locations of wells that have experienced water-level declines of at least 75 feet or rises of at least 50 feet. Also shown are wells that have long-term records, providing users with information on the changes recorded water levels over several decades.