Fig. 7 Numerically simulated breakthrough curves (BTCs, thick lines) and predicted BTCs (thin lines) by the approximate steady-state flow model Eq. [9] as a function of cumulative drainage, I, at various depths in the sandy loam with = 2 cm for (a) Infiltration Regime 1 (Case 1), (b) Infiltration Regime 2 (Case 2), and (c) Infiltration Regime 3 (Case 3). Labels on the BTCs refer to the observation depth (cm)

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