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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 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...
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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. SWPA_alvbsn is a vector dataset of alluvial-fill basin statistics for the Southwest United States. Statistics for each basin include physical details such as area, landcover, elevation, slope and precipitation. Anthropogenic data for basin include landuse, population, and wateruse.
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The Lower Rio Grande Valley in south Texas is one of the largest migratory bird stopovers in North America and a major birding hotspot. Reservoir development allowed controlled flows of the lower Rio Grande River and subsequent agricultural expansion in the river valley, resulting in rapid population growth and habitat loss, causing significant declines in fish and wildlife populations. Gulf Coast Prairie Landscape Conservation Cooperative partners wish to restore habitat and self-sustaining migratory bird populations in the valley.


    map background search result map search result map Bird Communities of Mature and Revegetated Tracts along the Lower Rio Grande Alluvial basin statistics of the Southwest Principal Aquifers (SWPA) study. Hydrogeologic Areas of the Southwest Principal Aquifer (SWPA) study Bird Communities of Mature and Revegetated Tracts along the Lower Rio Grande Alluvial basin statistics of the Southwest Principal Aquifers (SWPA) study. Hydrogeologic Areas of the Southwest Principal Aquifer (SWPA) study