evidence: On the one hand the project draws on quite scientific and rational resources such as hydrology and infrastructure. Investigation of how the river has been canalized and narrowed down to its minimum space shed light on the isolation of the Rhine Delta over a century ago by 'corrected' river profiles. It made this huge area (of approximately 3,100 hectares) increasingly static considering natural processes of tide, inundation and drainage, but had also affected the role water took in the development of the area, when detaching it from the surrounding. Extreme water level fluctuations were detected, that combined with large quantities of Alps sediments that the river brings, keep it a flood prone area. Moreover, in order to deal with the sediments deposits at the mouth of the canal, the Rhine Canal was prolonged several times into lake Constance. Now it is about to cross Austria 's territorial water and is affecting the drinking water quality of Germany as it distributes fine sediments over growing areas in the lake.