Fig. 3. Distribution of vertical hydraulic gradients (VHG, a and b) and permeability (c and d) along the study reach. The shaded bar indicates the deposition subreach, preceded by the reference and followed by the post-deposition reach. Symbols indicate mean ± standard deviation from of two to three replicate minipiezometric measurements, and refer to 9 July 2003 (), 31 July 2003 (), and 2 Sept. 2003 ().