Spatial Variation in Hydraulic Conductivity Determined by Slug Tests in the Canadian River Alluvium Near the Norman Landfill, Norman, Oklahoma

Department of the Interior

U.S. Geological Survey

Water Resources Investigations Report 97-4292


By Martha A. Scholl and Scott Christenson


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Slug tests were used to characterize hydraulic conductivity variations at a spatial scale on the order of meters in the alluvial aquifer downgradient of the Norman Landfill. Forty hydraulic conductivity measurements were made, most along a 215-meter flow path transect. Measured hydraulic conductivity, excluding clayey layers, ranged from 8.4 × 10-7 to 2.8 × 10-4 meters per second, with a median value of 6.6 × 10-5 meters per second. The hydraulic conductivity measurements yield a preliminary concept of the permeability structure of the aquifer along this transect. A low hydraulic conductivity silt-clay layer at about 4 meters below the water table and a high hydraulic conductivity layer at the base of the aquifer appear to have the most potential to affect contaminant transport. Specific conductance measurements show the leachate plume along this transect becomes attenuated between 150 and 200 meters downgradient of the landfill, except at the base of the aquifer, where it extends at least 225 meters downgradient of the landfill.




Purpose and Scope


Previous Studies

Slug-Test Method

Hydraulic Conductivity Determinations

Preliminary observations of aquifer structure and plume location


References Cited


  1. List of slug tests performed June 1996 and October 1996 at the Norman Landfill, Oklahoma

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