Fig. 5. The contribution of process input parameters (%) to the prediction uncertainty of each modeling output variables (3600 runs): (a) chemical concentration in first paddy water runoff (IREAT), (b) cumulative chemical concentration in paddy runoff over a 21-day treatment period, and (c) time-weighted chemical concentration in water runoff over a 21-day treatment period (TW21). See Table 2 for input variable definitions.