Figure 3.

Examples of classified stained profiles (black: dye stained; white: nonstained; gray: roots and black areas) and their corresponding profiles of dye coverage representing a gradient with increasing degree of preferential flow. Calculated parameters used to quantify the degree of preferential flow are shown next to each picture (DC: dye coverage (%), shown in red solid line; UniFr: uniform infiltration depth (cm), shown in green dashed line; TotStAr: total stained area (cm²); PF-fr: preferential flow fraction (%); LI: length index; PI: peak index).