Project part-financed by the European Union (European Regional Development Fund)

The Interreg IVB North Sea Region Programme

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Vorder- und Hinterwerder

Measure description

The measure ‘Tidal habitat Vorder- und Hinterwerder’ was designed and implemented as a compensation measure after national environmental law for establishing an integrated disposal area for dredged material in Bremen-Seehausen.
A tidal habitat on a scale of 27 ha (Figure 2) was realized in a northern German estuary for the first time. The compensation measure therefore had a pilot nature for several similar compensation measures implemented after 1997 (e.g. Kleinensieler Plate, Rönnebecker Sand).

In order to increase the tidal influence on the project area, the summer dike was partly lowered over a length of 25 m down to 1.7 m above sea level and an in- and outlet structure was installed 1.9 m above sea level. As a result, the mean tidal range on the project area amounts to approximately 0.7 m (4 m in the lower Weser River).
The 5 ha shallow water area is permanently covered with water. At low tide, water depths between 0.2 – 0.5 m were observed. Additionally, deeper areas of the Vorderwerder were established by ground excavation in order to improve the situation for fish and to slow down the natural siltation of the shallow water area by serving as a sediment trap (Figure 3). On higher areas, grassland was milled to initiate grazing land development.

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Report: Management measures analysis and comparison