MODFLOW 6 models used to simulate the long-term average surficial groundwater system for the contiguous United States
Seventy-five steady-state two-dimensional groundwater flow (MODFLOW-6) models 
of the shallow groundwater system were developed to map depth to water and 
estimate effective surficial transmissivity for the contiguous United States (CONUS). 
The models were driven by spatially-distributed recharge estimated by Reitz …