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These data were released prior to the October 1, 2016 effective date for the USGS’s policy dictating the review, approval, and release of scientific data as referenced in USGS Survey Manual Chapter 502.8 Fundamental Science Practices: Review and Approval of Scientific Data for Release. This geodatabase includes spatial datasets that represent the Central Valley aquifer system in the State of California. Included are: (1) polygon extents; datasets that represent the aquifer system extent, the entire extent subdivided into subareas or subunits, (2) raster datasets for the altitude of each aquifer subarea or subunit, (3) altitude, and thickness contours used to generate the surface rasters, (4) georeferenced images...
    map background search result map search result map Geodatabase of the datasets used to represent the two subunits of the Central Valley aquifer system, California Geodatabase of the datasets used to represent the two subunits of the Central Valley aquifer system, California