Variability of Hydraulic Conductivity in Sandy Till: The Effects of Scale and Method Open-file report; contains unpublished data that has not yet been peer-reviewed. Groundwater Surficial Geology Data and Resources WOFR1993-04 Variability of Hydraulic Conductivity in Sandy Till: The Effects of Scale and Method Rayne, T.W.; 1993 Report: 290 p. Download Related Collections Open-File Report View Open-File Report