This vegetation type, dominated by Rorippa amphibia, occurs in oxbows, alluvial pools, ditches, channels, on fluvial sediment accumulations and in lentic sections of rivers. It rarely occurs in fishponds and strongly eutrophicated water bodies with deep organic sediments. Water is usually 10–80 cm deep, but water table often drops far enough to expose the bottom in summer. This vegetation type occurs in lowlands and warm colline areas.