De Vlaamse Waterweg is asking Flanders Hydraulics to initiate a study related to breach formation in the Sigma area. The aim is to build a modelling toolbox in which breaching is possible at different locations along the Zeeschelde, based on the most recent Zeeschelde model in Mike11. The two most important aspects to be considered are the determination of the potential locations for breach formation and the parameters of breach formation and breach growth. This can be based on previous studies. Based on the simulation results, flood maps can be drawn up to examine the impact of breaches. The project will be divided into three phases: Project initialisation, construction of model instrumentation with breaches, execution of scenario calculations and analyses with model instrumentation. The course of the second and third phases will depend on the outcome of the previous phase(s), in consultation with the client. Possible outsourcing of the second and third phases of the project can be done through the Water Management framework contract.