Far reaching changes are planned for the hydrological regime of the UNESCO Biosphere Reserve Demonstration Site Lobau in Vienna. Looking at the present status, the level of biodiversity and the quality of the floodplain ecosystem are still high, and therefore the area is still in compliance with the earlier aims, which led to the introduction of protection measures, since this site is a Biosphere Reserve, a Ramsar Site, a Natural Protection Area, and part of the Danube National Park.