Roland W Tollett

d1_Pot2018RasterFt Potentiometric surface, Mississippi River Valley alluvial aquifer, spring 2018, raster format, in feet

This dataset is the raster, in feet, of the potentiometric-surface map, spring 2018, Mississippi River Valley alluvial (MRVA) aquifer. The raster cell size is 1,000 meters; the raster altitude data was referenced to the North American Vertical Datum of 1988 (NAVD 88). The raster was interpolated using (1) most of the available groundwater-altitude data from wells and surface-water-altitude data from streamgages, and (2) potentiometric-surface contours.

Tags: Arkansas, Illinois, Kentucky, Louisiana, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, aquifer, geoscientificInformation, groundwater, groundwater altitude, groundwater levels, inlandWaters, potentiometric surface, surface-water altitude, water table, Fewer tags

F04_wlc161820_Water-level change, spring to spring, 2016-18, 2018-20, 2016-20, Mississippi River Valley alluvial aquifer, in feet

This dataset is a point shapefile of wells measured for the potentiometric surface maps of the Mississippi River Valley alluvial aquifer (MRVA) in Spring 2016, 2018, and 2020. The data provided for each well considered in the applicable potentiometric surface map are the water-level date, altitude [relative to the North American vertical datum of 1988 (NAVD88)], a useYYYY code (which is positive if the water level was used in the potentiometric surface map for that year), a use comment (which is populated for water levels not used), and the water-level change values, for 2016-18, 2018-20, and 2016-20 for water levels with positive useYYYY codes for the applicable years. The data provided for each streamgage considered...

Tags: Arkansas, Illinois, Kentucky, Louisiana, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, aquifers, biota, digital elevation models, groundwater, groundwater altitude, groundwater and surface-water interaction, groundwater level, groundwater levels, hydrogeology, inlandWaters, surface-water altitude, water-level change, Fewer tags

F03_d2w2020_Depth to water, spring 2020, Mississippi River Valley alluvial aquifer, raster format, in feet

This dataset is a raster surface, in feet, of the depth to water, spring 2020, Mississippi River Valley alluvial aquifer (MRVA). The raster cell size is 1,000 meters (3,280.8 ft). The raster was interpolated using (1) depth-to-water (GW_D2W) data from wells and (2) an assumed value of zero for depth to water at streamgages (SW_D2W) because the precise depth to groundwater at the streamgage is not known..The streamgage data is used only when it appears the regional aquifer and surface water are hydrologically connected.

Tags: Arkansas, Illinois, Kentucky, Louisiana, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, aquifers, biota, depth-to-water surface, digital elevation models, groundwater, groundwater altitude, groundwater and surface-water interaction, groundwater level, groundwater levels, hydrogeology, inlandWaters, surface-water altitude, Fewer tags

F01_d2w2016 Depth to water, spring 2016, Mississippi River Valley alluvial aquifer, raster format, in feet

This dataset is a raster surface, in feet, of the depth to water, spring 2016, Mississippi River Valley alluvial aquifer (MRVA). The raster cell size is 1,000 meters (3,280.8 ft). . The raster was interpolated using (1) depth-to-water (GW_D2W) data from wells and (2) an assumed value of zero for depth to water at streamgages (SW_D2W) because the precise depth to groundwater at the streamgage is not known. The streamgage data is used only when it appears the regional aquifer and surface water are hydrologically connected.

Tags: Arkansas, Illinois, Kentucky, Louisiana, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, aquifers, biota, depth-to-water surface, digital elevation models, groundwater, groundwater altitude, groundwater and surface-water interaction, groundwater level, groundwater levels, hydrogeology, inlandWaters, surface-water altitude, Fewer tags

b_Surface_WaterPts Surface-water-altitude data, from streamgages, considered for the potentiometric-surface map, Mississippi River Valley alluvial aquifer, spring 2018

This dataset contains surface-water-altitude (SWA) data from streamgages that was used or considered to create a potentiometric-surface map for the Mississippi River Valley alluvial (MRVA) aquifer for spring 2018. The surface-water-altitude data was referenced to the North American Vertical Datum of 1988 (NAVD 88). The streamgages are measured continuously. The streamgage measurement that was used was from early April 2018 and is an estimate of the groundwater altitudes at the gage location. The resultant potentiometric-surface contours and raster represents the generalized central tendency for spring 2018, but it would not be useful for some purposes, such as for calibration of a groundwater-flow model for early...

Tags: Arkansas, Illinois, Kentucky, Louisiana, Mississippi, All tags... Mississippi Alluvial Plain, Mississippi River Delta, Mississippi River Valley alluvial aquifer, Missouri, Tennessee, aquifer, geoscientificInformation, groundwater, groundwater altitude, groundwater levels, inlandWaters, potentiometric surface, surface-water altitude, water table, Fewer tags