The Similarity Hypothesis and New Analytical Support on the Estimation of Horizontal Infiltration into Sand

Figure 4

Matric gradient as a function of 𝑥 inside the soil for times 𝑡₁, 𝑡₂, and 𝑡₃ equal to 15, 60, and 300 min (from down to up), according to (50a) or (50b).