Iconic project in the spotlight: Sigma plan Durme Valley

Antea Group collaborated closely with various partners and stakeholders to develop the redevelopment plans for the Durme Valley, combining safety and nature conservation. The result? A resilient area that not only provides protection against flooding but also creates opportunities for biodiversity and recreation. A project that remains socially relevant today and is built to stand the test of time.

The Durme, a river with a turbulent history, is once again being given the space it needs between the dam in Lokeren and the mouth in Hamme. Within the contours of the historic valley, measures are being taken to ensure both safety and the restoration of nature. For example, ring dikes around Klein and Groot Broek have been constructed, and the old landfill has been remediated. The final step is the depoldering, which involves creating four breaches in the old dikes. For Klein Broek, this step was completed in 2024, and the transformation into a tidal landscape is well underway. This restores the natural dynamics of the river and makes the area more resilient to flooding.

In addition to water management, the Sigma Plan also offers new recreational opportunities. The dikes, cycling, and walking paths will become part of the Scheldt Valley National Park. In the slopes of the floodplains, between the ring dike and the surrounding residential areas, there is space for play infrastructure, adventure, and relaxation. At the same time, the created wetlands in areas such as Hagemeersen, Bulbierbroek, and Weijmeerbroek provide a natural habitat where rare bird species find their home. These wetlands act as a buffer against climate change and contribute to the sponge function and ecological restoration of the valley.

Furthermore, the authentic open meadow landscape, typical of the region, is being restored. Native species and landscape elements are given space here again, with hay meadows, wetlands, and reed beds providing a home to numerous species, including the bluethroat and the reed bunting.

The Sigma Plan Durmevallei remains a prime example of integrated area development as a response to climate challenges. The interventions in water management, nature development, and recreation provide lasting benefits for both people and nature. Thanks to joint efforts, the region is being made resilient to climate change. A future where safety and sustainability are at the core.