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Cover: Three-dimensional rendering of a partially saturated sand-pack illustrating the non-uniformity in water and air distributio in the pore space following drainage. The gray regions are sand grains, black areas are air-filled pores, and the lighter grey areas are water-filled pores. Images collected for different drainage conditions showed significant variability in both water saturation and distribution for the two types of boundary conditions (slow or fast drainage). The images were obtained with computed X-ray microtomography at the GSECARS beam-line at the Advanced Photon Source. D. Wildenschild, J.W. Hopmans, M.L. Rivers, and A.J.R. Kent present their findings in "Quantitative Analysis of Flow Processes in a Sand Using Synchrotron-Based X-ray Microtomography," p. 112-126.

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