Figure 5. Topographic map of the study site with 1-m contour interval. Channels once connected to the main channel (southeast) have been offset as the three beheaded channels to the northwest. Our trench excavations exposed offset channels in T2, T3, T8, T6', and T7. The T7 channel has subsequently captured the small drainage immediately above it. The cross section below shows the topographic profile through the beheaded channels (dashed line on map) and the projected channel cross sections exposed and surveyed in the excavations. Note that the offsets determined by matching the channels defined in the trenches are different than those determined just from the offset geomorphology. Trench locations (closed polygons) are mapped from survey data.