MI-O8.12.03-26-1527 - 1

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The purpose of the contract is the provision of services relating to the development and implementation of a coherent and reproducible methodology for the review or definition of alert thresholds intended for the announcement, monitoring and forecasting of floods and inundations, as well as their definition for the Walloon municipalities affected by the flooding. Description of the services to be performed: The first objective is to define and/or verify the consistency of the discharge thresholds used by the Directorate of Hydrological Management of the SPW MI in the context of flood forecasting and flood alerting. This involves validating, setting or revising: - The threshold values for discharges that cause the first overflows, as well as those corresponding to the justification for moving into pre-alert and alert phases. The discharge with a return period of 100 years, or that of the largest flood known, will complement the information equivalent to an extreme flood threshold; - The division of the Walloon territory into “catchment areas / river reaches” that are hydrologically homogeneous for the dissemination of the pre-alert and alert phases. A coherent and…

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