What is the Sigma Plan?

The Sigma Plan protects Flanders from flooding. In extreme weather conditions, the river Scheldt and its tributaries can reach dangerously high water levels and can even overflow their banks. That is why the Sigma Plan invests in sturdier and higher levees and in a chain of natural flood control areas in the river valleys. Areas like these can catch excess river water in a controlled manner. This gives the rivers room to flow and to overflow. Read more


The Sigma Plan should be completed by 2030. We launch new projects every five years. We are already implementing a first series of projects, others are being prepared step by step in the meantime. Discover our projects.