Alsterfleet

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Alsterfleet between Schaartorschleuse (above) and Graskellerbrücke (below).
Fish ladder at the town hall lock
Schaartor lock , view from the inland port

The Alsterfleet is a canal in Hamburg and has been the main drain of the Alster into the Elbe since the end of the 19th century . It begins south of the Kleine Alster at the lock bridge and flows into the inland port after about 1000 meters at Steinhöft (not far from baumall ) . The Alsterfleet is the only continuously navigable connection between the Alster and Elbe.

Locks

Two locks at the beginning and end of the Alsterfleet regulate the water level of the Alster and enable shipping between the Alster and Elbe: the town hall lock under the lock bridge (between Rathausmarkt and Poststrasse ) and the Schaartor lock under the Schaartor bridge. The latter is part of the dike defense line and was created to protect downtown Hamburg after the storm surge in 1962 . In order to be able to drain the Alster even when the Elbe floods, three pumps were installed here that can pump up to 130,000 cubic meters of water per hour from the Alster into the Elbe.

Fish ladders

During the day only a little water is drained from the Alster so as not to endanger shipping. Therefore, the level of the Alster is mainly regulated at night and then sinks by an average of about 10 cm. Because the water in the Alsterfleet regularly reaches high flow speeds at night, fish, mussels and small organisms cannot survive here. In 2014 a fish ladder was set up at the town hall lock to allow fish to climb from the Elbe into the Alster. A second fish ladder was built at the mill lock between the tide-dependent Nikolaifleet and the Mönkedammfleet, which is connected to the Alsterfleet.

history

The water level of the Alsterfleet was regulated for the first time in the 12th century. From the 13th to the 15th century, the canal protected the city as a western moat (around the area of ​​today's old town ). In 1530 it was included in the inner-city navigable canal network. Old name: Admiralty Street Fleet . In a map from 1890, the northeastern part from the Reesendamm bridge to the junction of the Mönkedammfleet is referred to as the Kleine Alster. The town hall lock, built over with the lock bridge, has enabled shipping between the Alster and Elbe since 1846 .

In 1973 a new building took place. On this occasion, generators donated by HEW , which use the water power of the Alster, were installed. Since the technology of regenerative power supply was not yet mastered, direct current generators were used, which exclusively fed the town hall's lighting .

The area between the Alsterfleet and the canals of Herrengraben and Bleichenfleet to the north-west of it is now also known as the “Fleetinsel” , although it is not an island in the true sense of the word.

A hiking trail has been lining the Alsterfleet since 2003.

Web links

Commons : Alsterfleet  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b Thomas Hirschbiegel: Without them Hamburg would drown . This lock keeps the city dry. In: Hamburger Morgenpost (ed.): Mopo.de . March 22, 2017 ( mopo.de [accessed March 22, 2017]).
  2. ^ A b Axel Tiedemann: Study of ideas breathes new life into Hamburg's canals. August 29, 2015. Retrieved March 26, 2017 .
  3. ↑ a b Alexander Schuller: Next to the town hall: stairs only for fish. Hamburger Abendblatt, July 18, 2014, p. 9 , accessed on March 22, 2017 .
  4. ↑ Axel Tiedemann: Why it takes so long to build a fish ladder. Hamburger Abendblatt, July 28, 2015, accessed on March 26, 2017 .
  5. ↑ An island in downtown Hamburg. hamburg.de, accessed on April 10, 2017 .

Coordinates: 53 ° 32 ′ 57 ″  N , 9 ° 59 ′ 10 ″  E