Fig. 2. Plan view of the Drewston catchment showing (a) a schematic layout of main catchment features including subclassified areas (see sector key in Table 1) and (b) soil sampling transects and locations overlaying a topographic index map of the catchment. Codes refer to transect identification (see Table 4). The term ln(/tan ß) denotes the topographic index, where is the upslope contributing area to a given point in the catchment and ß is the local surface slope angle. The wetland is located downstream of the arrow identifying transect MFG1–MFG8.