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Water distribution

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In these two experiments we visualize the soil moisture status in a soil column, which is in a hydraulic equilibrium with an adjustable water reservoir. In the graphs, the depth distribution of the total water potential, its gravitational potential, and the soil water potential are shown as pressure heads. They do not depend on the soil material, but only on the vertical distance to the water level (.

The graphs also show the depth distribution of the water content. This state variable does depend on the soil material in the column. "Sand" and "clay" can be selected as soil materials. The experiment on the left shows the case of a homogeneous column, the one on the right a column with two layers of different texture.

Pictures on “capillary fringe”

Questions to think about

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Next: Waterflow