In 2003, 200m of the Bièvre was re-opened in the Parc des Près in Fresnes.
At the same time, over twenty direct wastewater connections to the Bièvre were eliminated.
When the river is completely disconnected from the wastewater system, the stormwater from the river will no longer flow into a wastewater treatment plant but will instead flow directly into the River Seine,
which is expected to lead to significant savings in wastewater treatment costs.

Another section of the Bièvre between Massy and Verrières was re-opened in 2006.
In 2003, 200m of the Bièvre was re-opened in the Parc des Près in Fresnes. At the same time, over twenty direct wastewater connections to the Bièvre were eliminated. When the river is completely disconnected from the wastewater system, the stormwater from the river will no longer flow into a wastewater treatment plant but will instead flow directly into the River Seine,
which is expected to lead to significant savings in wastewater treatment costs.
Another section of the Bièvre between Massy and Verrières was re-opened in 2006.
Bièvre (river)