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

7
PARC DE PARILLY
SAINT-PRIEST
The work carried out jointly by Grand Lyon and the park
managers has allowed a solution to be found which satisfies
the public’s expectations in terms of multifunctional space
and the demands of rainwater management.
The techniques selected
Of the 3 basins built, the settling basin is the only one closed
to the public. The retention basin stores rainwater and
becomes a BMX course when it dries out. The infiltration
basin is covered with an anti-contamination film to limit
the migration of pollutants into the ground. Part of this basin
has been made into a wetland area, to establish a new habitat
for the amphibian populations of the Parc de Parilly.
THE CONTAL MIXED DEVELOPMENT ZONE
LA TOUR-DE-SALVAGNY
Carried out prior to the design of the development of the Contal
Mixed Development Zone, an urban environmental analysis
revealed the highly specific topography of the development
land. It has allowed a management system to be put in place
which follows the natural course of water.
Green rainwater management
The rainwater network in the Contal Mixed Development Zone
comprises drainage trenches topped with swales.
Perpendicular to the slope, they hold back run-off water more
effectively. Thanks to the roof terraces of the homes and the
tanks in each city block, water from private plots discharges
into this limited-flow network. To protect the soil from any
accidental pollution, an anti-contamination geo-membrane
carpets the base of the trenches.
Grassed swales for the planted retention basins...
Once in the swale, the water percolates into the ground,
thereby reaching the drainage trench, and from there passes
into the drain which carries it to the 3 retention basins.
Installed in the centre of the mixed development zone,
in the wetland area, they are supplied with rainwater and water
from the Écurie source, located at the high point of the mixed
development zone. The first basin always contains water while
the following two take the overflow from the first.