Overview
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ABSTRACT
This article presents feedback from experience in the Bièvre valley to cope with recurrent flooding, with solutions based on nature. The hydraulic actions undertaken in the 1980s - waterproofing, linearization of the watercourse, creation of a regulation basin - to tame the watercourse had degraded the ecology of the river. The water law of the 2000s brought it back to life. A program to restore the natural environment resulted in the emptying of permanent bodies of water to manage hydraulic flows while preserving the natural environment in wetlands.
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Hervé CARDINAL: Technical Services Manager - SIAVB (syndicat intercommunal d'assainissement de la vallée de la Bièvre), Verrières-le-Buisson, France
INTRODUCTION
Faced with the multiple challenges posed by environmental emergencies (flooding, extreme heat, loss of biodiversity), it is essential to address these issues simultaneously, with a systemic vision. More and more projects are being launched to address these issues locally, over shorter or longer periods of time, in the most effective way possible, and with actions that are within everyone's reach.
The Bièvre valley, 15 km from Paris, is known for its semi-torrential regime and flooding. Hydraulic structures such as regulation basins in the river's right-of-way and concrete settling structures in the watercourse built after the floods of the 1980s were typical of the civil and hydraulic engineering of the time, with little respect for the river's ecology. In addition to the biological impoverishment of the environment caused by these infrastructures, their operating costs were constantly rising. This prompted the SIAVB to take steps to restore the natural environment by draining the permanent water bodies.
Key points
Sector: Environment.
Companies concerned: local authorities, civil service.
Technologies/methods involved: ecological engineering, flooding, resource protection.
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KEYWORDS
biodiversity | Wetland | nature-based solutions
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Nature-based solutions to reduce flooding: the case of the Bièvre valley