MOMIGNIES - Replacement of the sluice at rue de Cendron on the arm of Ruisseau “La Wartoise”

Objective and description of the work: The purpose of this contract is to replace the sluice located under rue de Cendron, crossing an arm of the "la Wartoise" stream, in the territory of the commune of Momignies. This development is part of an overall program to reduce the risk of flooding in the hamlet of Cendron. During episodes of significant flooding in the Wartoise, particularly during the exceptional floods of July 2021, the overflowing of the watercourse caused significant damage to homes as well as neighboring infrastructure, including a fish farm and tourist lodges. Smaller overflows are also recurrently observed during major rainy events. Hydrological and hydraulic studies carried out on the watershed have highlighted that the existing structure constitutes a limiting point for the flow of water during periods of flooding. The project therefore consists of replacing the existing sluice with a new structure of greater hydraulic capacity, consisting of a prefabricated reinforced concrete sluice with a useful section of 3.00 m × 2.00 m, accompanied by slight adaptations upstream and downstream necessary for its proper functioning. This work will improve the transit of flood flows and promote better distribution of flows in the sector. The replacement of the sluice constitutes one of the developments identified in the hydraulic study. Its effectiveness is reinforced by other interventions planned in the sector, in particular the developments carried out by the owners of the Cendron ponds and the work carried out by the Province of Hainaut aimed at redirecting part of the flows towards this new structure. All of these measures contribute to reducing overflows in built-up areas and improving the protection of property and people exposed to the risk of flooding. The work includes in particular: - preparatory work