The Ladenbek is a stream in the southeast of Hamburg, which flows through the Boberger Niederung nature reserve, among other things, and flows into the Bille there.
The Ladenbek was once a small spring stream that rose from a wet meadow between today's Weberade and Grandkupplung streets and turned from the Geesthang through dry areas on the Moosberg, before soon flowing into the Bille.
Due to increasing soil sealing through building in its source catchment area, the upper Lohbrügge, the natural water supply was steadily reduced. However, since more rainwater had to be drained off due to the increasing number of buildings, a rainwater retention basin was built north of Bergedorfer Straße (Bundesstraße 5) and the Ladenbek was relocated to a straight concrete channel.
Due to the concreting of the channel, the insects and plants could not adapt to the water body, the balance was disturbed. Furthermore, the water balance in the Boberg lowlands was disturbed because no water could seep away.
Therefore, in 1987, the concrete channel in the area of the Boberger Niederung was removed again in order to achieve that the stream becomes more natural and that animals and plants can settle better. In addition, a seepage pond was created in the upper third so that the surrounding area can also benefit more from the surface water. In a further step, the rainwater retention basin was also restored to a condition that was more in line with nature.
Source: Wikipedia