Prior to regulation, the Danube in Vienna had been an 8-kilometre (5 mi) wide wetlands, as a patchwork of numerous streams meandering through the area (see maps).
On the left bank, a 450-metre (1,480 ft) wide flood-prone area, the Inundationsgebiet, was created with the dam Hubertusallee covering today's municipal districts of Floridsdorf and Donaustadt.
The new main branch, including shipping, was 280 metres (920 ft) wide, leaving the old river bed as the Old Danube.
Overall, the Danube regulation is designed for a capacity of up to 14 thousand cubic metres per second (490×10^3 cu ft/s), which is the estimated maximum flow of a flooding which took place in 1501.
Major floods in Vienna were: [1] A series of articles on regulation of the Danube in chronological order