La gestion intégrée des eaux pluviales - AQUA-ADD Interreg IVC ...

5
THE SILK DISTRICT
VAULX-EN-VELIN / VILLEURBANNE
In compliance with Grand Lyon’s strategic objective
to disconnect rainwater from the combined sewer system,
the Rue de la Poudrette has been equipped with a drainage
and percolation trench.
Two techniques - the right solution
Made up of ballast with a porosity of 40%, covered with
a geotextile limiting the furnish of fines into the structure,
the trench recovers rainwater from the pavements by means
of ditches in planted spaces. After initially being stored,
the water then percolates under the pavement. It is used
to irrigate the trees planted on the Rue de la Poudrette.
For its part, the rainwater from the carriageway is still
connected to the combined sewer network, given
the proximity of the potable water catchment.
THE BON LAIT MIXED DEVELOPMENT ZONE
LYON 7
Allocated for residential and office use, the Bon Lait mixed
development zone will have various equipment and 20% green
spaces which will be irrigated by the rainwater harvested.
The techniques selected
There will be swales in addition to a drainage trench. All these
installations will be planted. The drainage shells will be coated
with an anti-contamination geotextile to prevent any risk
of contamination of the subsoil in the event of accidental
pollution. The water from roofs will be managed on site
by means of diffusion wells.