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To capture the heterogeneous flow pattern and enhance the prediction accuracy of preferential flow in unsaturated soil, the iodine-starch staining method was applied to visualize the preferential flow pattern from the background in this research. The digital imaging procedure was conducted to obtain the heterogeneous distribution pattern of preferential flow paths, and soil sampling was conducted to obtain the heterogeneous distributions of soil water content and solute concentration in thedoi:10.4236/jwrr.2012.13012 fatcat:qqklmgqtjzapdcsheyvty5piau