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Despite the potential benefits of hydromorphological restoration both in ecological and recreational terms, restoration of urban rivers and streams is not always feasible or desirable to the extent of similar restoration activities in rural areas. Flood risk protection of densely populated areas in downtown parts of cities remains a priority and is, in the same time, a barrier to extensive restoration projects. Due to such limitations, the administration of the city of Vienna follows a stepping stone approach to improve the hydromorphology of rivers. According to this approach, restoration has started from the outskirts of the city and moves into the city step by step, as the urban sections of the rivers are more difficult to restore.

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