Harlesiel Pumping Station

The Harlesiel pumping station was built between 1953 and 1957 and marks the provisional conclusion of a century-long dyking of the Harle Bay. Today, it separates the outer harbor from the inner harbor in Harlesiel. Locks have been installed for the passage.
The area of the Harle Bay is drained through the Harlesiel pumping station. The four turbines can pump a maximum of 54,000 m³ of water per hour from the depths into the storage polder, filling it within just six hours. At low tide, the access to Wangersiel is then opened so that the Harle can drain into the Wadden Sea unhindered. While in the early days a caretaker was responsible for the facility, today the pumping station is controlled by an automatic measuring system. The Harlesiel pumping station currently drains an area of 22,000 hectares from a watercourse network of three hundred kilometers in length.

Wikipedia