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The boundary between ground water with a dissolved-solids concentration greater than 10,000 mg/L (milligrams per liter) and ground water with a dissolved-solids concentration less than 10,000 mg/L in the Silurian and Devonian carbonate-rock aquifer in southwestern and northern Indiana has been used to establish one boundary for the Midwestern Basins and Arches regional ground-water-flow system. This boundary defines an internal "limit" for the Silurian and Devonian carbonate aquifers in Indiana where the mathematical simulation of ground-water flow must account for differences in fluid density. Additionally, a dissolved-solids concentration of 10,000 mg/L is a maximum limit for potential potability as recommended by the U.S. Environmental Protection Agency (1984). The boundary also has implications for the petroleum industry in deep parts of the Illinois Basin because the migration of hydrocarbons may be related to the presence and flow of connate saline water. In 1988, the Midwestern Basins and Arches Regional Aquifer-System Analysis was initiated as part of the U.S. Geological Survey's Regional AquferSystems Analysis (RASA) program (Sun, 1984). The objectives of the Midwestern Basins and Arches RASA project were to define the geology, hydrology, and geochemistry of the regional ground-water-flow system in the surficial and the Silurian and Devonian carbonate-rock aquifers (Bugliosi, 1990). The Silurian and Devonian carbonate-rock aquifer in southwestern

water-resources investigations report

Approximate location of the 10,000-milligram-per-liter dissolved-solids boundary in the Silurian and Devonian carbonate-rock aquifer, southwestern and northern Indiana