FIG. 5. Cumulative probability density of the ratio of the maximum annual leaching concentration for the lysimeter divided by the 80th percentile leaching concentration for the field. The maximum is the maximum of two annual average leaching concentrations following a single application. The 80th percentile is derived from a series of 20 2- or 3-yr average flux concentrations for application every 2 or 3 yr, respectively. The probability density was based on 200 hypothetical pesticides with randomly generated organic-matter/water distribution coefficient, K_OM, values between 0 and 100 L kg^–1 and DegT50 values between 1 and 100 d, but results were included only if the 80th percentile concentration of the pesticide was above 0.1 µg L^–1.