Filters: Tags: Groundwater and Streamflow Information Program (X) > Date Range: {"choice":"year"} (X)

Filters Date Types (for Date Range) Contacts Brian R Clark U.S. Geological Survey Roland Viger Joseph D Hughes Paul M Barlow More... Tag Types Theme (1) USGS Scientific Topic Keyword (1) Harvest Set (1) Label (1) Place (1) Tag Schemes USGS Thesaurus (1) Geographic Names Information System (GNIS) (1) View Results as: JSON ATOM CSV

National-Scale Grid to Support Regional Groundwater Availability Studies and a National Hydrogeologic Database The National Hydrogeologic Grid (NHG) dataset includes a raster and vector representation of 1-km cells defining a uniform grid that encompasses the continental United States. The value of each cell of the raster dataset corresponds to the 1-km cell number defined as 'cellnum' in the attributes of the vector data. The NHG consists of 4,000 rows and 4,980 columns, numbered from the top left corner of the grid, to correspond to the traditional row and column numbering system of the MODFLOW groundwater-flow simulation code (Hughes and others, 2017; Langevin and others, 2017). The Albers projection was chosen for the NHG because of the capability to best preserve area, which is crucial in the computation of volume for... Tags: Climatology, Conterminous U.S., Geophysics, Groundwater and Streamflow Information Program, Hydrogeology, All tags... USGS Science Data Catalog (SDC), Water Quality, Water Resources, groundwater availability, groundwater model, modflow, national grid, national hydrogeologic database, national hydrogeologic framework, national hydrologic grid, usgsgroundwatermodel, water use, Fewer tags