The article discusses the architectural expression of houses built on water, based on the design process of the floating house in the Czerniakowski Port in Warsaw, designed by Mai Bui Ngoc and Rafał Mazur. The question of the form of the floating house was the starting point of the work on this project. Usually buildings are designed in a specific location, which gives architects an inspiration for the design of the new form. In the case of the floating houses the goal was to make a universal artefact as a car or a phone. This artefact should be more connected to the owner than to the landscape. This artefact should be also neutral to the landscape and it should not be destructive for the surroundings. The answer lays between two archetypes; a typical house and a boat. Analysis of the existing floating houses gave the conclusion that authors of these houses were usually very close to one of these two archetypes. It is a need to put a lot of effort to design an object which does not remind a real house and a yacht design.

The aim of the study was to analyse the state of flood-prone areas development in 10 towns on the Warta River in the Wielkopolska region in terms of the possibility of adapting existing and planned buildings to flood risks. A significant percentage of the areas exposed to floods was the basic criterion for selecting three towns for the second stage of the research. The analysis of the content of 22 local spatial development plans (LSDP) in three selected towns has revealed that the plans for special flood hazard areas (SFH) and embanked areas lack precise requirements for flood adaptation. The research proved that small riverside towns in Wielkopolska region insufficiently use planning tools to create appealing and resilient waterfronts and reduce their vulnerability. New buildings not adapted to changing water levels are still being built in the flood-prone areas, because LSPD plans do not impose such requirements. The authors proposed the graphical analysis method (based on overlay maps), which allows to indicate the areas requiring special flood-adaptation guidelines. The building and site recommendations in LSDP should refer to BFE level and may include various types of amphibious architecture and their location conditions, which has been identified in the study.