Fuhlsbüttel Lock

... or the lock, which is actually a weir. In 2011, the 100-year-old lock system was demolished for security reasons and replaced by a new building. A little bit, I still mourn the small lock keeper's house, which has given way to a functional new building, but overall the new building has succeeded. Now there is a fish ladder and sitting steps where you can enjoy the last rays of the evening sun - if it shines. ;) Canoes can be transported via a boat slip system between the upper and lower reaches.

In addition, despite conversion, the hydropower plant commissioned in 2000 was preserved. The Alster generates electricity for around 200 households here. An information board informs interested technology fans.

The Fuhlsbüttler lock separates the canalized Alster Unterlauf from the unpaved upper course. In the wide dammed basin between the lock and Ratsmühlenbrücke, the man of the Alster has put his stamp on his last time, after which he is free and moves largely in their natural bed. Here begins the natural and green part of the Alster.

"The human being", whose work one sees here, is - one observes on the dark red clinker - course Oberbaudirektor Fritz Schumacher. The complex along with the parallel blocks of flats on the Woermannsweg and Justus-Strandes-Weg goes back to his designs.

The former lock at this point is called Fuhlsbütteler lock and is now, since 2013 after the reconstruction, a weir.

The Fuhlsbüttel lock was built in 1914 with a lock chamber and two Wehrfeldern each side of the lock chamber. In 1934 and 1968, the lock was rebuilt. After almost 100 years of operation, the lock was no longer stable, the building fabric of the lock chamber and the banks were porous and cracked. Also, the fish pass at the lock was badly damaged and did not allow a rise of fish in the upper reaches of the Alster. In 2011, the lock was completely redesigned in two years of construction and now consists of an automatically controllable weir, which serves to protect against inland floods on the Alster River and the water level of the Alster. The fish ladder was renewed by a meander fish pass.

In order to protect the fish fauna, so that the fish do not get into the turbine, was overdimensioned the inlet channel, the inflow velocity of the water before the rake reduced. In addition, a "fish escape tube" at the beginning of the inlet channel prevents the fish from entering the turbine. Of the discharge through the weir, primarily up to 0.5 m³ / s are fed in and out, and up to 3.6 m³ / s (maximum displacement) in the hydropower plant.

Source:
de.wikipedia.org/wiki/Alsterschleusen#Fuhlsbütteler_Schleuse
gebr-neumann.de/backend/FILES/projekte/15-03-31_08-56-08_Bereich_Hafen-_und_Wasserbau_Projekt_Schleuse_Fuhlsbuettel.pdf

Until 2011, the Fuhlsbüttel Lock, completed in 1914, was still a proper lock,
i.e., it still had a lock chamber. However, this was getting old
and ultimately no longer stable. It took until 2013 to convert it into a pure weir structure
that helps regulate the water level of the Upper Alster. A new fish ladder with a so-called meandering fish pass was installed. This creates different flow conditions in a very small space through small, offset basins that can be used by fish to ascend.A hydroelectric power plant with a nominal output of 110 kW had already been installed in 2000.hamburger-sammelsurium.de/fuhlsbuetteler-schleuse.html