Filters: Contacts: {oldPartyId:7819} (X) > Extensions: Shapefile (X) > Categories: Data (X)

Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Types Downloadable (2) Map Service (2) OGC WFS Layer (2) OGC WMS Layer (2) Shapefile (2) Contacts Jaime A Painter Lynn J Torak U.S. Geological Survey - ScienceBase Water Resources Drew A Westerman More... Tag Types Place (2) Theme (2) Harvest Set (2) Tag Schemes USGS Thesaurus (2) Common geographic areas (1) Geographic Names Information System (GNIS) (1) View Results as: JSON ATOM CSV

Digital surfaces of the bottom altitude and thickness of the Mississippi River Valley alluvial aquifer and site data within the Mississippi Alluvial Plain project region Bottom altitudes of the Mississippi River Valley alluvial aquifer (MRVA) were compiled from interpretations of subsurface geophysical logs (log picks) at about 10,000 boreholes and wells located throughout the Mississippi Alluvial Plain (MAP) that were available from previous investigations. Five sources of the bottom altitude data are listed numerically in the Cross Reference section (below) and correspond with the Ref_code listed in the .shp dataset. Borehole geophysical data (log picks) were referenced (corrected) to the National Elevation Dataset (NED) 10-meter digital elevation model (DEM; https://nationalmap.gov/elevation.html). Log picks that required a DEM correction of less than 20 feet were retained for... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas, Arkansas River, Cross Validation, Crowley's Ridge, Geostatistics, All tags... Kriging, Louisiana, Lower Mississippi-Gulf Water Science, Mississippi, Mississippi Alluvial Plain, Mississippi River, Mississippi River Delta, Mississippi River Valley Alluvial Aquifer, Mississippi Valley, Missouri, Tennessee, USGS Science Data Catalog (SDC), Variogram modeling, hydrogeology, Fewer tags Mississippi Alluvial Plain Extent, November 2017 The Mississippi Alluvial Plain (MAP) has become one of the most important agricultural regions in the US, and it relies heavily on a groundwater system that is poorly understood and shows signs of substantial change. The heavy use of the available groundwater resources has resulted in significant groundwater-level declines and reductions in base flow in streams within the MAP. These impacts are limiting well production and threatening future water-availability for the region. This product will help not only scientists in our center, but also at a national level. This product will also be part of a larger study encompassing the Mississippi Alluvial Plain region. The Mississippi Alluvial Plain extent was delineated... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas, Arkansas River, Illinois, Kentucky, LMG, All tags... Louisiana, Lower Mississippi-Gulf Water Science, MAP, MAP, Mississippi, Mississippi Alluvial Plain, Mississippi Alluvial Plain, Mississippi River, Mississippi River Delta, Mississippi Valley, Missouri, Tennessee, U.S. Geological Survey, U.S.Geological Survey, USGS, USGS Science Data Catalog (SDC), Water Availability and Use Science Program, aquifer system, groundwater availability project, groundwater modeling, hydrogeology, water availability project, Fewer tags