Fig. 1. Finite element domain used to simulate the advance of a wetting front into a domain with an initial uniform pressure head of -0.5 m. The circular holes in the domain are no-flow boundaries to represent the obstruction to flow caused by a 2H(0.01) TDR probe. Schematic vertical cross-sections of 2V and 3H probes are shown as well. The rods lie in the horizontal plane for all of the probe designs.

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