Great Basin Basemap

The rocks and deposits of the Great Basin carbonate and alluvial aquifer system (GBCAAS) are grouped into hydrogeologic units that are inferred to have reasonably distinct hydrologic properties due to their physical characteristics.

Regional groundwater availability studies enable information about groundwater to be integrated and consistent, so that this resource can be analyzed and understood on an aquifer–wide scale. These studies provide decision–makers with a better understanding of the status and trends in the Nation's groundwater availability.

The Great Basin Carbonate and Alluvial Aquifer System (GBCAAS) was part of the federally-funded USGS Water Availability Program. Specific objectives of the study included quantifying current ground-water resources, evaluating how those resources have changed over time, and developing tools to assess system responses to stresses from future human uses and climate variability. The GBCAAS study...