Fig. 7. Modeled variation with downstream distance of + ß fraction and total riverine endosulfan concentration, integrating all transport pathways (spray + vapor + dust + runoff), for the (a) Namoi River and (b) Pian Creek, using model parameters in Table 3. Plots with distance are given for times t = 2, 10, and 40 d after the start of spraying. A major runoff input occurs on Days 8 and 9 at X = 35 km. In (a) the 2-d line is beneath the 40-d line.