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To examine the persistence of preferential flow paths in a field  soil, and to compare the leaching of a degradable contaminant with  the leaching of a tracer, two field  experiments were performed using a multi-compartment sampler (MCS). The first experiment  was carried out during the snowmelt period in early spring, characterized  by high infiltration fluxes from snowmelt. The second experiment was  carried out in early summer with irrigation to mimic homogeneous  rainfall. During the second experiment, the soil was warmer and  degradation of the degradable contaminant was observed. For both  experiments, the highest tracer concentrations were found in the  same area of the sampler, but the leached tracer masses of the  individual locations were not highly correlated. Thus, the  preferential flow paths were stable between the two experiments. With a lower  infiltration rate, in the second experiment, more isolated peaks in  the drainage and the leached masses were found than in the first  experiment. Therefore, it is concluded that the soil heterogeneity is  mainly caused by local differences in the soil hydraulic properties,  and not by macropores. With higher infiltration rates, the high and low leaching cells were more clustered. The leached  masses of the degradable contaminant were lower than the leached  masses of the tracer, but the masses were highly  correlated. The first-order degradation rate and the dispersivity were fitted with CXTFIT; the first-order degradation rate was  0.02 d<sup>&minus;1</sup>, and the dispersivity varied between 1.9 and  7.1 cm.  The persistence of the flow paths during the experiments suggests soil  heterogeneity as the driver for heterogeneous flow and solute transport in this soil.  At the MCS scale, heterogeneous snowmelt did not seem to have much influence on the  flow and solute paths

Quantifying heterogeneous transport of a tracer and a degradable contaminant in the field, with snowmelt and irrigation