Project description
This strategically located water catchment is made up of a weir and an outlet pond which feeds a gallery cut into the rock. The water then flows by gravity to the Bellepierre treatment plant, which delivers 48% of the drinking water supply for the city of Saint Denis. Consequently, this project is of great importance and raises considerable challenges in terms of continuity of service, environmental issues, and the risk of floods and landslides.
The weir has suffered considerable damage, and the gallery no longer conveys water efficiently due to leaks in its base slab.
The city of Saint-Denis has entrusted the SCP / SAFEGE / CYATHEA consortium with full project management:
- Construction of an access road along the riverbed, including 8 river crossings
- Reinforcement works on the weir to reduce the likelihood of abrasion and erosion at its base, construction of a fish pass, and installation of a regulation system at the intake to control the volume of water diverted towards the treatment plant and the volume returned to the river, thus ensuring a minimal instream flow
- Improvement of the water main between the dam and the treatment plant
