“Ever wondered where Hamburg’s waterways begin their journey?” Today, our story starts at the Bornbach. This small stream has a big story. It reflects Hamburg’s history and its relationship with nature.
The Bornbach begins as a trickle near Norderstedt. It flows five kilometers through Langenhorn. Once, it was a simple brook. But in 1932, the Bornbach was straightened. It became a channel to manage rainwater. This regulation changed its natural state drastically. The Bornbach became less of a stream and more of a drainage ditch. Its banks were reinforced, and its course straightened. This made it efficient for water runoff but harmed its ecosystem.
However, efforts have been made to restore the Bornbach. Below the Kiwittsmoor retention basin, it starts to resemble a natural stream again. Unsecured banks and diverse wildlife mark this section. You might spot great mussels or small fish. The area near Loki and Helmut Schmidt’s former home is especially scenic. Here, the Bornbach meanders past gravel banks and fallen trees. Young alder trees line the banks. Water starwort plants sway in the current providing shelter for fish.
Keep an eye out for the kingfisher or gray heron hunting along the Bornbach. These birds are signs of a recovering ecosystem. At the U-Bahn Langenhorn Nord, the stream flows into the Diekmoor retention basin. Then, it continues its straight path westward. It passes under the Langenhorner Chaussee. Finally, it joins the Tarpenbek.
Natural streams should have varied habitats. Fast flowing areas and stagnant pools are both important. Tree roots offer shelter and food. Fallen trees create deeper pools for larger fish. To recreate these conditions, Hamburg has worked with the NABU. School classes and citizens helped rebuild natural structures in the Bornbach. These renaturation projects aim to transform it from a channel back into a stream.
Despite these efforts, the Bornbach still faces challenges. The diversity of aquatic life is not yet what it could be. Many species need clean, nutrient poor water to thrive. Restoration work has been done near Kulenstück. However, this area has invasive Japanese knotweed.
The Bornbach shows Hamburg’s changing approach to its waterways. From a regulated channel to a restored stream. It highlights the importance of balancing human needs with ecological health. The Bornbach is a reminder that even small streams play a vital role in our environment. So next time you pass a small stream, remember the Bornbach. It’s a symbol of Hamburg’s ongoing journey toward a greener future.