Fig. 9 Numerically simulated breakthrough curves (BTCs, thick lines) in the loam with = 2 cm for Infiltration Regime 2 (Case 4), as function of (a) time, t, (b) cumulative drainage I together with predictions by the approximate steady-state flow model Eq. [9] (thin lines), and (c) solute penetration depth together with predictions by the approximate steady-state flow model Eq. [14]. Labels on the BTCs refer to the observation depth (cm)

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