Paris is actively bringing back the Bièvre, a once‑buried tributary that runs 36 kilometers from Guyancourt to the Seine. City officials and neighboring municipalities are uncovering sections of the river to create green corridors, improve water quality, and provide natural cooling amid record‑breaking heat.
Local effort to revive a forgotten waterway
Deputy Mayor Dan Lert, in charge of ecological transition, called the project “deeply eco‑friendly” and essential for climate adaptation. In the suburb of Haÿ‑les‑Roses, project manager Marie Bontemps of the Joint Syndicate of the Bièvre Watershed (SMBVB) walked beside a newly exposed stretch, noting that the river is being liberated after more than a century of concrete cover.
Restoration work includes removing pipelines, excavating riverbeds, and planting native vegetation along the banks. In Haÿ‑les‑Roses, Arcueil and Gentilly, flood‑retention areas have been created, and water quality is now regularly monitored. Hundreds of meters of the river are slated to open in Paris’s southeastern Kellermann Park by 2028.
Benefits for residents and the environment
The revived Bièvre offers multiple benefits: evaporative cooling that lowers urban temperatures, flood mitigation by absorbing heavy rains, and new habitats for wildlife. Residents will gain pedestrian and cycle paths alongside the water, fostering daily interaction with nature.
Between 2020 and 2024, wastewater entering the Bièvre dropped by the equivalent of the daily output of roughly 2,400 people, according to SMBVB estimates. The goal is a further reduction to 4,374 BOD5 people‑equivalent by 2030, eliminating the need for separate purification facilities.
Funding and future plans
Financial backing has been crucial. In December 2025, the Seine‑Normandie Water Agency allocated €68.6 million for 2026‑2030 restoration work, adding to €76 million already spent from 2020‑2024. While the river will never be fully uncovered—some sections lie 10‑15 meters below the surface—the plan is to expose key segments for public enjoyment.
Experts like historian Raphaël Morera and SIAVB technical director Hervé Cardinal stress that the project not only improves water quality but also restores the river’s cultural heritage, reminding Parisians of their historic relationship with water.
The effort aligns with broader European initiatives, such as the EU Water Framework Directive and the World Wildlife Fund’s Freshwater Challenge, which aim to restore hundreds of thousands of kilometers of rivers by 2030.
Original reporting: KRDO (Colorado Springs metro) — read the source article.
