Horizontal and vertical hydraulic conductivity of the streambed were estimated from results of hydraulic tests along four transects across the east branch Grand Calumet River, northern Lake County, Indiana. Tests were done in two types of temporary wells installed in the streambed--2- inch-diameter wells with a 1- or 2-foot length of wire-wrapped screen and 3-inch-diameter wells open at the ends. When possible, the hydraulic tests included monitoring falling- and rising-water levels. Forty-seven tests for horizontal hydraulic conductivity and 20 tests for vertical hydraulic conductivity were done. Horizontal hydraulic conductivity of the streambed varied. Compared to the previously reported range of horizontal hydraulic conductivity for the Calumet aquifer, results of 24 hydraulic tests in the streambed were within the reported range, 18 were less than the lowest reported value, 5 were greater than the highest reported value. Vertical hydraulic conductivity of the streambed was less varied than horizontal hydraulic conductivity. Hydraulic conductivity of the streambed generally was dependant on the type of sediments in the part of the streambed tested. Most of the streambed contained soft, fine-grained sediments; parts of the streambed contained fill materials including coal, cinders, and concrete and asphalt rubble. The highest values of horizontal hydraulic conductivity generally were calculated from data collected at locations where the streambed contained fill materials, particularly concrete and asphalt rubble. The lowest values of horizontal hydraulic conductivity were calculated from data collected at locations where the streambed contained fine-grained sediments.
Additional publication details
USGS Numbered Series
Hydraulic conductivity of the streambed, east branch Grand Calumet River, northern Lake County, Indiana
Water-Resources Investigations Report
U.S. Geological Survey ;
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