New rules on flood risk

On 1 January 2023 the duty to inform about flood risk changes. The distinction between actually and potentially flood-prone disappears. It is replaced by a P-score and a G-score and new water maps.

The current water-assessment map still colours flood sensitivity for a building and its plot as a whole. From 1 January 2023 both the building and the plot receive a separate flood score. This makes it clear whether flooding is limited to part of the (lower-lying) plot or also threatens the buildings.

The plot score and the building score are divided into 4 classes, from A to D, depending on the flood source (rain, sea or rivers):

• Class A: no flooding modelled
• Class B: small chance of flooding under climate change
• Class C: small chance of flooding under the current climate
• Class D: medium chance of flooding under the current climate

You can consult these new flood maps and a handy information leaflet via the links below.

• Flood maps (waterinfo.be)
• CIW information leaflet (pdf)