This study aims to the composition of a manual for the sanitation of fish migration barriers, which is a policy support document on behalf of the rehabilitation of fish migration in Flanders. There are four major topics : the collection of literature data, a discussion of the migration action-plan, a proposal for the sanitation of migration barriers in Flemish watersheds (gradual, by priority) and finally the lay out of technical guidelines for the removal of migration barriers, illustrated with some examples.