WASHINGTON, May 15 (TNSLrpt) -- The U.S. Geological Survey issued 'Top Elevation of Glacial Till and Thickness of the Big Sioux Aquifer Delineated From Electrical Resistivity Tomography Surveys Near Sioux Falls, South Dakota, 2022 and 2025,' authored by Colton J. Medler and Todd M. Anderson; it is Scientific Investigations Report 20265023 and was prepared in cooperation with the City of Sioux Falls in 2026. The report says USGS collected electrical resistivity data along 22 transects across thr  more