This applet displays the solution to the Richards Equation for a vertical flow of fluid into an initially dry porous medium. The porosity of the porous medium is determined from an arbitrary 50x50 pixel subset of the image at the left. Using the scrollbar, you can enhance (increase) the actual porosity by 0% to 50%. Enhancing the porosity by X% is equivalent to randomly selecting X% of the no-flow pixels (white pixels) and reassigning them to be dry flow pixels (black pixels). The middle half of the top boundary is fixed to have saturation one. Elsewhere on the boundary a no-flow boundary condition is enforced.