Hydrogeologic data for Carroll County, Arkansas

This report is a compilation of existing and new hydrogeologic data for Carroll County, Arkansas.Data presented include water levels and water quality from selected wells; discharge and water quality from selected springs; geologic and geophysical data relevant to defining a hydrogeologic framework; and surface aspects of selected karst features.Water-quality data include (1) major constituents and properties, (2) trace constituents, and (3) nutrients, microorganisms, and miscellaneous constituents. Objective and ScopeThe objective of this report is to present a compilation of hydrogeologic data for Carroll County, Arkansas, that can be used to better define and manage the ground-water resources.Prior to this compilation, existing data were scattered through numerous published and unpublished sources, many of which had limited distribution and were difficult to acquire.In anticipation of a needed data base that can be readily accessed and easily used, the Arkansas Soil and Water Conservation Commission and the U.S. Geological Survey entered into a cooperative agreement to compile existing data for a 16-county area of northern Arkansas (fig.1), and to collect additional data where few data exist.This report is the second in a series of county reports.Hydrogeologic data for Boone County were published in 1991.Carroll County was chosen because it has more existing data than most of the nearby counties and its hydrogeology encompasses most conditions found in the 16-county area.Subsequent reports will present data from the remaining 14 counties.This report is restricted to basic ground-water data, and no interpretations or explanations are included.The types of data in this report are: information about wells and springs from which data or samples were collected, ground-water levels, spring discharge measurements, water-quality analyses for wells and springs, and surface aspects of selected karst features.In addition, published references with geophysical log and geologic log descriptions necessary for understanding the hydrogeologic framework are included in the report.The data presented herein have been selected from verifiable sources, including published reports, unpublished records from the files of the U.S. Geological Survey, and new data collected specifically for this study.Hydrogeologic data from sources outside the U.S. Geological Survey generally have not been included in the accompanying tables.However, reference to these original documents, many of which contain data tables, is included in the Previous Investigations and Selected References sections that follow.