Updating of the Liège PCDN (Municipal Nature Development Plan)


Liège, the second most populated city in Wallonia, is a meeting point between urban and natural environments, where buildings and roads meet the waters of the Meuse, the soil of slag heaps steeped in history and the oak and beech trees of the Sart-Tilman area. While the development of one has often been at the expense of the other, coexistence between nature and human activities is essential.

Titre de la référence


The objectives of updating the Municipal Nature Development Plan (PCDN) are as follows:

  • Update the inventory drawn up at the time of the first PCDN (1998) and identify the key elements of the ecological network;
  • Determine the specific biodiversity of priority sites in terms of urban planning and public space development;
  • Identify the necessary and priority links to improve the ecological network.


As part of this study, ICEDD participated in:

  • The creation of information sheets on the best way to take biodiversity into account in the urbanisation of certain sites with defined challenges (10 in number);
  • The creation of information sheets on how to improve the ecological network in five specific locations in the municipal area;
  • The calculation of the surface biotope coefficient per housing block and the establishment of a methodology for calculating the theoretical surface biotope coefficient to be achieved for each housing block;
  • The implementation of a methodology for characterising the quality of green spaces and the identification of places in the municipal area where the needs of residents in terms of high-quality green spaces are not met.

Our references