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Location Folder Show Tree ROOT _ScienceBase Catalog __USGS Lower Mississippi-Gulf Water Science Center ___@ Mississippi Alluvial Plain (MAP) Regional Water-Availability Study Economics, Groundwater Modeling, and Decision Support Groundwater Levels Hydrogeologic Framework Quality Assurance of Water Level Records from Wells in the Mississippi River Valley Alluvial Aquifer in Missouri from the Missouri Department of Natural Resource's Well Information Management System (WIMS) Surface Water Model More... Filters Date Range Past year (14) Past month (1) Past week (0) Past day (0) Custom range... To   Search Extensions ArcGIS Service Definition (9) Shapefile (6) NetCDF OPeNDAP Service (1) Types Map Service (26) OGC WFS Layer (17) OGC WMS Layer (17) Downloadable (15) OGC WMS Service (11) More... Contacts U.S. Geological Survey - ScienceBase U.S. Geological Survey Lower Mississippi-Gulf Water Science Center Virginia L McGuire Nebraska Water Science Center More... Categories Data (26) Data Release - Revised (3) Tag Types Theme (40) Place (40) USGS Scientific Topic Keyword (21) Harvest Set (39) Tag Schemes USGS Thesaurus (31) None (14) Common geographic areas (17) Geographic Names Information System (GNIS) (9) ISO 19115 Topic Category (19) none (1) USGS Thesaurus Groundwater (1) More... View Results as: JSON ATOM CSV Browse Folder

Airborne electromagnetic, magnetic, and radiometric surveys of the Mississippi Alluvial Plain and Chicot Aquifer System, March 2018 and May - August 2021 Airborne geophysical surveys were acquired in March 2018 and May 25 through August 7, 2021 using a helicopter-based platform. These surveys were collected along 10,706 line-kilometers (line-km) within selected areas of the Mississippi Alluvial Plain (MAP) and the Chicot Aquifer System in the southeastern United States. The airborne geophysical surveys include electromagnetic, magnetic, and radiometric sensor data collected in rivers and levees throughout the two areas to evaluate groundwater and surface-water interaction, riverine ecosystems, and infrastructure. This data release contains three child items that provide: Minimally processed (raw) data supplied by the airborne contractor (Xcalibur Multiphysics)... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: "Geomorphology"], "Hydrology", "Sedimentology", "Stratigraphy", "Water Resources", All tags... Arkansas, Arkansas River, Bayou Lacassine, Bayou Teche, Big Sunflower River, Black River, Bogue Phalia, Calcasieu River, Chicot aquifer, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Illinois, Little Red River, Little Sunflower River, Louisiana, MRVA, Mermentau River, Mississippi, Mississippi Alluvial Plain, Mississippi River, Mississippi River Valley Alluvial aquifer, Missouri, Obion River, Ouachita River, Raccourci Old River, Sabine River, Saline River, Tennessee, Tensas River, USGS Science Data Catalog (SDC), Vermillion River, WAUSP, Water Availability and Use Science Program, White River, ["Geophysics", aeromagnetic surveying, aeroradiometric surveying, electromagnetic surveying, electromagnetics, engineering sciences, environment, geophysics, geoscientificInformation, geospatial datasets, groundwater, hydrogeology, magnetic field, magnetics, radiometrics, resistivity, water resources, Fewer tags Hydrogeologic Aquifer Test dataset, Lower Mississippi-Gulf Water Science Center, December 2021 Since the 1940's, commercial, academic and government hydrologists have used aquifer tests to estimate the hydrogeologic properties of an aquifer near test wells. Results from these tests are recorded in various files, databases, reports, and scientific publications. The U.S. Geological Survey (USGS), Lower Mississippi-Gulf Water Science Center (LMG) is aggregating all aquifer test results from Alabama, Arkansas, Louisiana, Mississippi, and Tennessee into a single dataset that is publicly available in a machine-readable format. The LMG-Hydrogeologic Aquifer Test Dataset – December 2021 contains information and results from 690 hydrogeologic aquifer tests. Additionally, this dataset contains 7 attribute tables... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Alabama, Alabama (AL), Aquifer, Aquifer, Aquifer Test, All tags... Aquifer Test, Arkansas, Arkansas, Conductivity, Conductivity, Groundwater, Groundwater, Hydrogeology, Hydrogeology, Louisiana, Louisiana, Lower Mississippi Gulf Water Science Center, Mississippi, Mississippi, Mississippi Alluvial Plain (MAP) Project, Mississippi Alluvial Plain (MAP) Project, Permeability, Permeability, Specific Capacity, Specific Capacity, Storage Coefficient, Storage Coefficient, Tennessee, Tennessee (TN), Transmissivity, Transmissivity, 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 Input data, trained model data, and model outputs for predicting streamflow and base flow for the Mississippi Embayment Regional Study Area using a random forest model This data release contains datasets developed for the purpose of training and applying random forest models to the Mississippi Embayment Regional Study Area. The random forest models are designed to predict total stream flow and baseflow as a function of a combination of watershed characteristics and monthly weather data. These datasets are associated with a report (SIR 2022-5079) and code contained in a USGS GitLab repository. The GitLab repository (https://code.usgs.gov/map/maprandomforest/) contains much more information about how these data may be used to supply predictions of stream flow and baseflow. Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Hydrology, USGS Science Data Catalog (SDC), Water Resources Generalized Additive Model This data release provides the data that support the findings in "Characterizing groundwater and surface-water interaction using hydrograph-separation techniques and groundwater-level data throughout the Mississippi Delta" by Killian and others (2019). This child item for the Generalized Additive Model includes GAMobs_0410_error data and metadata with the grid node coordinates in North American Datum of 1983 (NAD 83) and results, including error estimates for the Generalized Additive Model (GAM) used to estimate the difference in groundwater altitudes relative to NAD 83 for April 10th of 1980 and April 10th of 2016. The paper associated with the data release quantifies the spatial and temporal changes in baseflow... Categories: Data; Tags: MAP, Mississippi, Mississippi River Delta, effects of groundwater extraction, groundwater, All tags... groundwater, groundwater and surface-water interaction, groundwater level, groundwater pumping, hydrogeology, mathematical modeling, statistical modeling, Fewer tags 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 (e1) Potentiometric surface, Mississippi River Valley alluvial aquifer, spring 2016, raster format, in feet A potentiometric surface map for spring 2016 was created for the Mississippi River Valley alluvial (MRVA) aquifer, which was referenced to the North American Vertical Datum of 1988 (NAVD 88), using most of the available groundwater-altitude data from wells and surface-water-altitude data from streamgages. Most of the wells were measured annually or one time, after installation, but some wells were measured more than one time in a year and a small number of wells were measured continually. Streamgages were typically operated continuously. The potentiometric surface map for 2016 was created as part of the U.S. Geological Survey (USGS) Water Availability and Use Science Program to support investigations that characterize... Tags: Arkansas, Illinois, Kentucky, LMG, Louisiana, All tags... Lower Mississippi Gulf Water Science Center, MAP, MRVA aquifer, Mississippi, Mississippi Alluvial Plain, Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, U.S. Geological Survey, U.S.Geological Survey, USGS, Water Availability and Use Science Program, aquifers, geoscientificInformation, ground water, groundwater, groundwater altitude, groundwater levels, inlandWaters, potentiometric surface, surface-water altitude, water table, Fewer tags OFR 2021-1008 MODEL ARCHIVE: Soil-Water-Balance model developed to simulate net infiltration and irrigation water use for the Mississippi Embayment Regional Aquifer System, 1915 to 2018 This model archive makes available the calibrated Soil-Water-Balance (SWB) model used to simulate potential recharge for the Mississippi Alluvial Aquifer for 1915 to 2018. The model was calibrated using monthly values of evapotranspiration and annual values of runoff and recharge for 19 drainage basins selected from within or nearby the Mississippi Alluvial Aquifer system. The calibrated SWB model and its use are described in the associated U.S. Geological Survey Open-File Report 2021-1008. The model was used to create output at two different scales: 1,609-meter and 1,000-meter grid cells. Also included are files used to generate a high-resolution (100-meter) subset of output for an area near Shellmound, Mississippi.... Tags: Alabama (AL), Groundwater, Hydrology, Kentucky (KY), Louisiana (LA), All tags... Mississippi (MS), Missouri (MO), SWB, Tennessee (TN), USGS Science Data Catalog (SDC), groundwater, groundwater recharge, numerical modeling, recharge, usgssoilwaterbalancemodel, water availability, Fewer tags Groundwater levels and other covariates useful for statistical modeling for the Mississippi River Valley Alluvial aquifer, Mississippi Alluvial Plain Groundwater-level data, in conjunction with attendant metadata and covariates (predictor variables) data, for the Mississippi River Valley alluvial aquifer (MRVA) are used to support statistical and process-based numerical modeling. This page represents a collection of groundwater-level data within the expanse of the Mississippi Alluvial Plain (MAP) (Painter and Westerman, 2018) and are derived from well-specific periods of record of discrete measurements and continuous water levels aggregated to daily statistics. The basic data structures are intended also to serve as interpretability standards for use by statistical software such as described by Asquith and Seanor (2019) and Asquith and others (2019). Tags: Arkansas, Louisiana, MAP, MAP, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi Alluvial Plain, Mississippi River Valley Alluvial aquifer, Mississippi River Valley Alluvial aquifer, Missouri, Tennessee, USGS Science Data Catalog (SDC), groundwater, groundwater levels, 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 Datasets used to map the potentiometric surface, Mississippi River Valley alluvial aquifer, spring 2020 A potentiometric-surface map for spring 2020 was created for the Mississippi River Valley alluvial aquifer (MRVA), which was referenced to the North American Vertical Datum of 1988 (NAVD 88), using most of the available groundwater-altitude data from wells and surface-water-altitude data from streamgages. The location and water-level altitude in feet for these wells and streamgages in spring 2020 are provided in this data release. The interpreted contours and raster of the potentiometric surface are also provided in this data release and in the associated report titled "Potentiometric surface, Mississippi River Valley alluvial aquifer, spring 2020" and available at https://doi.org/10.3133/sim3478/. Tags: USGS Science Data Catalog (SDC) MODFLOW 6 models for simulating groundwater flow in the Mississippi Embayment with a focus on the Mississippi Delta This model archive contains the model files for the MERAS 3 and Mississippi Delta groundwater flow models documented in the U.S. Geological Survey Scientific Investigations Report 2023-5100. The MERAS 3 model provides a simplified representation of groundwater flow in the Mississippi Embayment Regional Aquifer Study (MERAS) area for the period of 1900 through 2018, with the primary goal of providing boundary fluxes for inset models focused on local areas of interest. The Mississippi Delta model simulates groundwater flow in the Delta region of northwestern Mississippi from 1900 through 2018, using boundary fluxes from the MERAS 3 model. A scenario version of the Mississippi Delta model extends the simulation to... Tags: Arkansas, Groundwater, Hydrology, InlandWaters, MODFLOW 6, All tags... Mississippi, Mississippi Delta, PEST++, USGS Science Data Catalog (SDC), United States, Water Resources, climate change, decision support methods, groundwater, groundwater flow, hydrogeology, mathematical modeling, modeling, modflow6, numerical modeling, pest++, usgsgroundwatermodel, water availability, water use, Fewer tags Combined remote sensing and water-balance evapotranspiration estimates (SSEBop-WB) for the conterminous United States This dataset includes 1km resolution monthly timescale estimates of evapotranspiration (ET) for the 2000-2015 timespan. These new SSEBop-WB estimates were developed by combining a previously published long-term annual average evapotranspiration map based on water balance constraints with the SSEBop remote sensing ET product (see Associated Items). The combination aims to leverage the advantages of each approach in gaining both the temporal resolution of remote sensing data and the long-term magnitude constraints of ground-based data. This data release also includes other supporting data associated with the publication of these estimation methods in a concurrent journal article. Analyses in the journal article included... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Remote Sensing, USGS Science Data Catalog (SDC), Water Resources The use of Continuous Resistivity Profiling to Evaluate Geomorphologic Controls on Aquifer Recharge in the Mississippi Alluvial Plain from Money to Steiner, Mississippi, August 2016 to November 2016 In cooperation with more than 10 local, State, and Federal stakeholders, the United States Geological Survey (USGS) is studying the aquifer systems in and near the Mississippi River alluvial plain (https://www2.usgs.gov/water/lowermississippigulf/map/index.html). This data release consists of continuous resistivity profiling (CRP) data collected by the USGS to characterize the electrical properties of geomorphological features in the part of the Mississippi River alluvial plain from Money, Miss. to Steiner, Miss. A total of 68 kilometers of multiple CRP profiles were obtained. The CRP data were collected by using the Ohmmapper TR-5 system (Geometrics, Inc., 2016) to determine if different geomorphological features... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, Map Service; Tags: Continuous Resistivity Profiling, Geomorphology, Geophysics, Geophysics, Greenville, All tags... Hydrogeology, Mississippi, Mississippi Alluvial Plain, Mississippi River Delta, Money, Sunflower, USGS Science Data Catalog (SDC), Water Resources, geoscientificInformation, groundwater, hydrogeology, water resource management, Fewer tags Modern monthly effective recharge maps for the conterminous U.S., 2003-2015 This data set includes 1 km resolution monthly timescale estimates of the effective recharge component of the water budget over the time period from October 2003 - December 2015. These estimates were developed as water budget residuals using previously published data sets for other water budget components: PRISM precipitation (Daly et al., 2008), SNODAS snow water equivalent (National Operational Hydrologic Remote Sensing Center, 2004), SSEBop-WB evapotranspiration (Reitz et al., 2017a), a map of groundwater-sourced irrigation (Reitz et al., 2017b), and monthly surface runoff maps (Reitz et al., 2019). The recharge data were estimated as the difference between water supply (precipitation plus snow melt plus irrigation)... Tags: Conterminous United States, USGS Science Data Catalog (SDC), recharge, water budget (c) Surface-water altitude data, from streamgages, considered for the potentiometric surface map, Mississippi River Valley alluvial aquifer, spring 2016 A potentiometric surface map for spring 2016 was created for the Mississippi River Valley alluvial (MRVA) aquifer, which was referenced to the North American Vertical Datum of 1988 (NAVD 88), using most of the available groundwater-altitude data from wells and surface-water-altitude data from streamgages. Most of the wells were measured annually or one time, after installation, but some wells were measured more than one time in a year and a small number of wells were measured continually. Streamgages were typically operated continuously. The potentiometric surface map for 2016 was created as part of the U.S. Geological Survey (USGS) Water Availability and Use Science Program to support investigations that characterize... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Arkansas, Illinois, Kentucky, LMG, Louisiana, All tags... Lower Mississippi Gulf Water Science Center, MAP, MRVA aquifer, Mississippi, Mississippi Alluvial Plain, Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, U.S. Geological Survey, U.S.Geological Survey, USGS, Water Availability and Use Science Program, aquifers, geoscientificInformation, ground water, groundwater, groundwater levels, inlandWaters, potentiometric surface, surface-water altitude, water table, Fewer tags Aquaculture and Irrigation Water-Use Model (AIWUM) Version 1.0 Estimates and Related Datasets for the Mississippi Alluvial Plain, 1999-2017 (ver. 2.0, April 2021) This data release contains monthly and annual water-use estimates from the Aquaculture and Irrigation Water-Use Model version 1.0 for the Mississippi Alluvial Plain, April 1999 to October 2017. Aquaculture and irrigation estimates contained in this data release are representative of groundwater withdrawal for six different categories: aquaculture, cotton, corn, rice, soybeans, and all other crops. Contained in this data release are monthly and annual estimates by water-use category and monthly and annual total estimates. Monthly and annual totals are a summation of water use for aquaculture, cotton, corn, rice, soybeans, and all other crops, by month and by year. Also contained in this data release are lands permitted... Categories: Data Release - Revised; Tags: Alabama, Arkansas, Illinois, Kentucky, Louisiana, All tags... Mississippi, Missouri, Tennessee, Texas, USGS Science Data Catalog (SDC), Water Resources, aquaculture water use, remote sensing, water supply and demand, water use, Fewer tags Aquaculture and Irrigation Water Use Model (AIWUM) 2.0 input and output datasets Datasets are inputs and outputs of Aquaculture and Irrigation Water Use Model (AIWUM) 2.0. AIWUM 2.0 employs remote sensing data sets and machine learning utilizing Distributed Random Forests, an ensemble machine learning algorithm to estimate annual and monthly groundwater use for irrigation and aquaculture (2014–20) throughout this region at 1 km resolution, using annual pumping data from flowmeters in Mississippi and real-time flowmeters in Arkansas, Louisiana, Mississippi, Missouri, and Tennessee. Aquaculture and irrigation estimates contained in this data release are representative of groundwater withdrawal for six different categories: aquaculture, cotton, corn, rice, soybeans, and other crops. Model results... Categories: Data; Tags: AIWUM, Arkansas, Distributed Random Forests, Louisiana, Mississippi, All tags... Missouri, Tennessee, USGS Science Data Catalog (SDC), aquaculture, groundwater, irrigation, water use, Fewer tags (b) Groundwater altitude data, from driller-measured wells, considered for the potentiometric surface, Mississippi River Valley alluvial aquifer, spring 2016 A potentiometric surface map for spring 2016 was created for the Mississippi River Valley alluvial (MRVA) aquifer, which was referenced to the North American Vertical Datum of 1988 (NAVD 88), using most of the available groundwater-altitude data from wells and surface-water-altitude data from streamgages. Most of the wells were measured annually or one time, after installation, but some wells were measured more than one time in a year and a small number of wells were measured continually. Streamgages were typically operated continuously. The potentiometric surface map for 2016 was created as part of the U.S. Geological Survey (USGS) Water Availability and Use Science Program to support investigations that characterize... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Arkansas, Illinois, Kentucky, LMG, Louisiana, All tags... Lower Mississippi Gulf Water Science Center, MAP, MRVA aquifer, Mississippi, Mississippi Alluvial Plain, Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, U.S. Geological Survey, U.S.Geological Survey, USGS, Water Availability and Use Science Program, aquifers, geoscientificInformation, ground water, groundwater, groundwater altitude, groundwater levels, inlandWaters, potentiometric surface, water table, 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 1 2 3 »