 This research sought to determine the effect of partial saturation on the permeability of granular soils. To do this, the researchers varied the suction applied to the samples and compared the resulting permeabilities. They found that the permeability was significantly different depending on whether the samples were fully or partially saturated. This article was authored by Luis Carlos Galvis, Juan Carlos Ruj Cardenas, Luis Carlos Galvis Alamanca, and others.