ESTIMATION DES DEBITS RARES DE CRUE POUR LES COURS D'EAU DE LA REGION WALLONNE (BELGIQUE)

摘要

The estimate of the extreme flood discharges of the rivers of Wallonia (Belgium) fits into the flood cartography project financed by the Walloon Region. This project, initiated in 2004, consists in the cartography of the flood hazard and of the damages risk due to floods by overflowing rivers. The flood hazard maps are established on the basis of hydraulic modelling which requires the estimate of extreme flood discharges. The source data are the average hourly discharges acquired by the hydrological measurement networks of the Walloon Region. Extreme flood discharges, corresponding to return periods of 25, 50 and 100 years, are calculated by adjustment of a statistical law to series of maximum annual discharges or to series of peaks-over-threshold, in the case of recent historical records of observations. The software HYFRAN used here was developed by the University of Quebec. The flood cartography is established on a scientific basis and is associated to urban regulations of corresponding areas. It will have a positive impact on the citizens by providing tools useful to treat request of permit, to target protection measures or installations, to make easier crisis management...%Les résultats de l'ajustement statistique sur les séries de débit ainsi que des données complémentaires concernant la station d'observation sont consignés dans un formulaire-type et transmis à l'équipe chargée de la modélisation hydraulique dans le cadre du projet de cartographie des zones d'inondation de la Région wallonne.