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Hydrogeologic Areas of the Southwest Principal Aquifer (SWPA) study 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 raster dataset represents the boundaries of the hydrogeologic areas of the Southwest Principal Aquifer (SWPA) study of the National Water Quality Assessment (NAWQA) program. It is a compilation of the pre-existing Hydrogeologic Areas of the Southwest Ground-Water Resources Project, with additional data from the Central and Coastal basins of California, Northern New Mexico Rio Grande Valley, and South Central Colorado San Luis... Tags: Arizona, Basin and Range Province, California, Great Basin, NSDI, All tags... New Mexico, Rio Grande Valley, Southwest United States, USGS Science Data Catalog (SDC), Utah, alluvial basin, boundaries, drainage basin, geoscientificInformation, southern California deserts, surface-water / ground-water interactions, watershed, Fewer tags