FIG. 12. Breakthrough curves calculated using the Dual-Permeability Model with Two-Site Sorption for a 10-cm-long soil column and the following parameters: solute pulse duration = 10 d, q_m = 3 cm d^–1, q_f = 30 cm d^–1, = _m = _f = 0.5, w = 0.1, _m = _f = 1 cm, K_dm = K_df = 1 cm³ g^–1, _b = 1.5 g cm^–3, _dp = 0.1 d^–1, _ch,m = _ch,f = 0.1 d^–1, and f_f = f_m = 1, 0.7, and 0.4. Matrix, fracture, and total breakthrough curves are represented by thin, medium, and thick lines, respectively.