Lynn J Torak

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

Digital surfaces and site data of well-screen top and bottom altitudes defining the irrigation production zone of the Mississippi River Valley alluvial aquifer within the Mississippi Alluvial Plain project region

Site data contained in the ScrIntrvls_AllSrcRefs_AllWellsRev.csv dataset define the top and bottom altitudes of well screens in 64,763 irrigation wells completed in the Mississippi River Valley alluvial aquifer (MRVA) that constitute a production zone in the Mississippi Alluvial Plain (MAP) extending across the midwestern and southern United States from Illinois to Louisiana. Each well entry contains an Enumerated Domain Value of the Attribute Label SrcRefNo to identify the state environmental agency that contributed to the database, and enumerated values are associated with specific state agencies by using the Enumerated Domain Value Definition. Screen-top and -bottom altitudes and land surface are referenced (corrected)...

Categories: Data; Types: NetCDF OPeNDAP Service; Tags: Arkansas, Arkansas River, Crowley's Ridge, Illinois, Kentucky, All tags... Louisiana, Lower Mississippi Gulf Water Science Center, Mississippi, Mississippi Alluvial Plain, Mississippi River, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, South Atlantic Water Science Center, Tennessee, USGS Science Data Catalog (SDC), Water Availability and Use Science Program, agriculture, cross validation, estimation variance, geostatistics, hydrogeology, irrigation, irrigation, kriging, variogram modeling, water resource management, watershed management, well-production zone, Fewer tags