Langenzersdorf intake structure, Intake structure with footbridge in Klosterneuburg, Austria

The Langenzersdorf intake structure is a water management facility spanning the New Danube in Klosterneuburg with an integrated footbridge for pedestrians. The installation uses prestressed concrete and serves both flood control and pedestrian crossing functions simultaneously.

The intake structure was built in 1975 as part of Vienna's Danube regulation, together with the New Danube and the Danube Island. It is the first of the three weirs on the New Danube, placed at river kilometre 1938.06 where the New Danube branches off the Danube. During Danube floods its weirs are opened to divert water into the New Danube and prevent flooding.

The intake structure marks the point where the New Danube branches off from the Danube at river kilometre 1938.06. Its weirs are opened during Danube floods to divert water into the New Danube; this usually brings a swimming ban there for one to several weeks until the water regains bathing quality.

The location is easy to access and provides pedestrians with direct passage across the footbridge, which remains open in most weather conditions. The area is openly accessible, allowing visitors to observe the facility's operations from different vantage points.

At the 2002 flood of the century, 10,000 m³/s flowed past this point, while the Danube and New Danube together can carry 14,000 m³/s here. A discharge of 8,000 m³/s corresponds to a water level of 7 metres at this gauge.