Surface and subsurface geologic data from previous USGS studies of the Gulf Coast region, south-central United States

This dataset captures in digital form the results of previously published U.S. Geological Survey (USGS) Water Mission Area studies related to water resource assessment of Cenozoic strata and unconsolidated deposits within the Mississippi Embayment and the Gulf Coastal Plain of the south-central United States. The data are from reports published from the late 1980s to the mid-1990s by the Gulf Coast Regional Aquifer-System Analysis (RASA) studies and in 2008 by the Mississippi Embayment Regional Aquifer Study (MERAS). These studies, and the data presented here, describe the geologic and hydrogeologic units of the Mississippi embayment, Texas coastal uplands, and the coastal lowlands aquifer systems, south-central...

Tags: 3D, Alabama, Arkansas, Cane River Formation, Carrizo Sand, All tags... Cenozoic, Claiborne Group, Coastal lowlands aquifer system, Cockfield Formation, Cook Mountain Formation, Eocene, Geography, Jackson Group, Kentucky, Laredo Formation, Louisiana, Lower Claiborne confining unit, Lower Wilcox aquifer, McNairy-Nacatoch aquifer, Memphis Sand, Middle Claiborne aquifer, Middle Claiborne confining unit, Middle Wilcox aquifer, Midway Group, Midway confining unit, Miocene, Mississippi, Mississippi River Valley alluvial aquifer, Mississippi River Valley alluvial aquifer, Mississippi embayment aquifer system, Missouri, NCGMP (National Cooperative Geologic Mapping Program), National Cooperative Geologic Mapping Program, National Geologic Synthesis Project, Oklahoma, Oligocene, Paleocene, Pliocene, Quaternary, Regional Aquifer System Analysis, Sparta Sand, Tennessee, Tertiary, Texas, Texas coastal uplands aquifer system, US GeoFramework Initiative, USGI, USGS Science Data Catalog (SDC), United States GeoFramework Initiative, Upper Claiborne Aquifer, Upper Wilcox aquifer, Vicksburg Group, Wilcox Group, Yegua Formation, alluvial, borehole, elevation, elevation, environment, hydrogeologic, marine shale, sandstone, stratigraphic thickness, structure contours, thickness, three dimensional, Fewer tags

Hydraulic Conductivity and Transmissivity Estimates from Slug Tests in Wells Within the Mississippi Alluvial Plain, Arkansas and Mississippi, 2020

During the spring and summer of 2020, the U.S. Geological Survey, Lower Mississippi – Gulf Water Science Center, conducted single well slug tests on selected wells within the Mississippi Alluvial Plain in Arkansas and Mississippi to estimate hydraulic conductivity (K) and transmissivity (T) values for the aquifers in which the wells are screened. A total of 324 tests were conducted on 48 wells. The computer software AQTESOLV version 4.50.002 (HydroSOLVE, Inc., 2007) was used to interpret the slug test data to estimate K and T values. Mean estimates of K for the 44 wells screened in the Mississippi River Valley alluvial aquifer ranged from 3 to 401 feet per day (ft/day) and mean estimates of T ranged from 285 to...

Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: 500-Foot Sand Memphis Sand, 500-Foot Sand Memphis Sand, 500-foot Sand, Ar, Arkansas, All tags... Common geographic areas, Conductivity, Groundwataer, Groundwataer, Groundwater, Hydraulic Conductivity, Hydraulic Conductivity, Instantaneous change in head test, Instantaneous change in head test, Memphis Sand, Mississippi, Mississippi Alluvial plain, Mississippi River Valley alluvial aquifer, Mississippi River Valley alluvial aquifer, Mississippi embayment aquifer system, Mississippi embayment aquifer system, Slug Test, Slug Test, Sparta Sand, Sparta Sand, Transmissivity, Transmissivity, USGS Science Data Catalog (SDC), middle Claborne aquifer, middle Claiborne aquifer, middle Claiborne aquifer, Fewer tags

Digitized Contour from Georeferenced plate 2007 from "Potentiometric Surface in the Sparta-Memphis Aquifer of the Mississippi Embayment, Spring 2007" (Shrader, 2008; version 1.1, April 2021)

The most widely used aquifer for industry and public supply in the Mississippi embayment in Arkansas, Louisiana, Mississippi, and Tennessee is the Sparta-Memphis aquifer. Decades of pumping from the Sparta-Memphis aquifer have affected ground-water levels throughout the Mississippi embayment. Regional assessments of water-level data from the aquifer are important to document regional water-level conditions and to develop a broad view of the effects of ground-water development and management on the sustainability and availability of the region's water supply. This information is useful to identify areas of water-level declines, identify cumulative areal declines that may cross State boundaries, evaluate the effectiveness...

Categories: Data; Types: Downloadable, GeoTIFF, Map Service, OGC WFS Layer, OGC WMS Layer, Raster, Shapefile; Tags: 2007, Alabama, Arkansas, Kentucky, Louisiana, All tags... Memphis Aquifer, Memphis Sand, Mississippi, Mississippi Embayment, Missouri, Sparta Aquifer, Sparta Sand, Tennessee, groundwater, potentiometric surface, spring, Fewer tags

MODFLOW-2005 model used to evaluate water-management scenarios for the Mississippi Delta

A three-dimensional groundwater flow model (MODFLOW-2005) of the Mississippi embayment, South-Central United States, was developed as part of a national project initiated by the U.S. Geological Survey Groundwater Resources Program to provide updated assessments of groundwater availability in important principal aquifers across the United States. The goals of the national assessment are to document effects of human activities on water levels and groundwater storage, explore climate variability effects on the regional water budget, and evaluate the adequacy of data networks at a regional scale. The Mississippi embayment was chosen because of the substantial dependency on groundwater for agriculture and municipal needs....

Tags: Alabama, Arkansas, Cane River Formation, Carrizo Sand, Claiborne Group Undifferentiated, All tags... Cockfield Formation, Cook Mountain Formation, East Gulf Coastal Plain, Groundwater, Groundwater Model, Illinois, InlandWaters, Kentucky, Louisiana, MODFLOW-2005, Memphis Sand, Midway Group, Mississippi, Mississippi Alluvial Plain, Missouri, NSDI, Sparta Sand, Tennessee, USGS Science Data Catalog (SDC), Vicksburg Group and Jackson Group, West Gulf Coastal Plain, Wilcox Group, Yazoo River Basin, Yazoo River Basin, environment, geoscientificInformation, inlandWaters, usgsgroundwatermodel, water availability, Fewer tags

MODFLOW-NWT models and calibration files for the Mississippi Alluvial Plain, USA

The existing three-dimensional groundwater flow model (MODFLOW-2005) of the Mississippi Embayment Regional Aquifer system (MERAS), South-Central United States, was updated with: 1) higher stream density; 2) more spatially refined recharge; 3) better estimates of water use; 4) more recent time period simulated; 5) more realistic storage conceptualization; and 6) more robust handling of dry nodes through use of MODFLOW-NWT. For this study, the MODFLOW-NWT groundwater flow model was used to evaluate four parameter estimation algorithms with lower computational burdens. This work was performed to update the previous version of the MERAS groundwater flow model for decision making in the Mississippi Alluvial Plain (MAP),...

Tags: Alabama, Arkansas, Cane River Formation, Carrizo Sand, Claiborne Group Undifferentiated, All tags... Cockfield Formation, Cook Mountain Formation, East Gulf Coastal Plain, Groundwater Model, Illinois, Kentucky, Louisiana, MODFLOW-NWT, Memphis Sand, Midway Group, Mississippi, Mississippi Alluvial Plain, Mississippi Embayment regional aquifer system, Missouri, PEST, Parameter Estimation, Sparta Sand, Tennessee, USGS Science Data Catalog (SDC), Uncertainty Analysis, Vicksburg Group and Jackson Group, West Gulf Coastal Plain, Wilcox Group, Yazoo River Basin, environment, geoscientificInformation, groundwater, inlandWaters, usgsgroundwatermodel, Fewer tags