Field testing of transport models for organic chemicals in surface and subsurface water.

The transport of organic chemicals in surface water (rivers) and in subsurface (unsaturated soil zone) is simulated with steady-state and transient model approaches. Time-series of measured and calculated concentrations in river and soil water are compared in order to validate model assumptions. The transport of 2,4,5-T in a luvisol soil after various time intervals in summer is compared with model calculations assuming transient water flow. The calculated percentages in the two upper soil layers lie within the measured range, given by the replicates