Figure F5. Hydraulic gradients vs. applied flow rates from the low-flow permeability testing on Samples (A) 180-1109C-23X-4, 43-65 cm (212.53 mbsf), (B) 180-1109D-4R-5, 105-125 cm (383.95 mbsf), (C) 180-1109D-15R-2, 68-88 cm (485.84 mbsf), and (D) 180-1109D-38R-2, 112-132 cm (698.10 mbsf). The linear relationship indicates that Darcy flow was established in each run, regardless of flow rate. Solid lines represent the linear trend line, and the solid points represent measured hydraulic gradients. The change in sign for flow rate and hydraulic gradient represents a change in flow direction. Negative indicates a flow direction from the top of the sample to the bottom, whereas positive indicates a flow direction from the bottom of the sample to the top.