Fig. 11. Active bacteria zone and accumulated solids concentrations after 2 and 3 years. Note that the images are longitudinal cross sections of the wetland (as in Fig. 1) which have
been deformed to fit a reasonable size. The x-axis of each image represents the longitudinal direction of the wetland (from 0 to 10.3 m) and the y-axis the depth of the wetland
(from 0 to 0.7 m). Also note that the coloured areas of each image correspond towetted areas,while thewhite areas correspond to areas withoutwater. Note thatwater level decreases
from inlet to outlet.