Primary Function
The main task of the locks is to balance the differing water levels between the Elbe River and the Kiel Canal, enabling smooth passage for ships. The Elbe’s water level can be above or below that of the canal, depending on the tides.
In Brunsbüttel, a lock operation (entry, mooring, water level adjustment, releasing lines, exit) can take up to 45 minutes.
In Kiel-Holtenau, ships are usually cleared in about 25 minutes due to the minimal tidal range of the Baltic Sea.
Locking procedures operate around the clock, 24 hours a day.
Secondary Function
The Brunsbüttel lock system also plays a crucial role in regional drainage. As the largest artificial drainage outlet in Schleswig-Holstein, the Kiel Canal absorbs vast amounts of water from the surrounding landscape. During low tide, this excess water is released into the Elbe via the locks.
Third Function
The canal cuts through the dyke line where it meets the Elbe. Because of this interruption, the locks must also perform the role of a dyke, protecting the low-lying inland areas from flooding. They are therefore constructed to serve as flood barriers.