A rounded indentation was carved into the left-hand (Brigittenau) quay wall, where the Schwimmtor was to be stowed when it was not needed.
Supporting the barrier with the same sort of elongated wall on the right-hand (Nussdorf) bank, thus creating a sluice-like gate, would not have been possible, because the current would have made it impossible to remove the barrier again once it had been placed across the canal.