Look for complete geospatial metadata in this layer's associated xml document available from the download link

* Metric Name: Groundwater Basin Boundaries  

* Tier: 3  

* Data Vintage: 02/2022  

* Unit Of Measure: Binary  

* Metric Definition and Relevance: This dataset shows the boundaries of groundwater basins and subbasins as defined by the California Department of Water Resources as last modified by the Basin Boundary Emergency Regulation adopted on October 21, 2015 and subsequent modifications requested through the Basin Boundary Modification Request Process.  

* Creation Method: Groundwater basins are represented as polygon features and designated on the basis of geological and hydrological conditions - usually the occurrence of alluvial or unconsolidated deposits. When practical, large basins are also subdivided by political boundaries, as in the Central Valley. Basins are named and numbered per the convention of the Department of Water Resources.

These boundaries have been converted from a polygon vector to a 30 meter
raster by the RRK team and clipped to the Northern California RRK.

  

* Credits: California Department of Water Resources