Jardin des Eaux (water garden) in Fourqueux, a water management system for the city centre

National Id
The city of Fourqueux (4000 inhabitants) has redesigned its urban space to build social housing. A plot of land has been set up at the heart of this area to collect and manage rainwater from the requalified area. Called water garden, the park collects water from 1.7 hectares of permeable and impervious area to allow it to infiltrate through a succession of temporary basins and a permanent one. It thus avoids the direct discharge of this rainwater into the separative network connected to the Seine. The water garden also acts as a natural space in the heart of a residential area, and allows the history of the municipality to be highlighted through cultural activities and the permanent display of old agricultural machinery.
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The in-depth description of the case study
Location description
The commune of Fourqueux is located in the Yvelines, and has 4000 inhabitants.
In 2014, the center of the municipality of Fourqueux underwent an urban redevelopment operation, consisting of the creation of 80 housing units and the renovation and restructuring of the municipal social and cultural center. In addition, this work has led to the establishment of separate networks.
The area under requalification covers 1.7 hectares. In the center of this area was a private garden of 3200 m² dating from the 1930s, abandoned and left fallow. It was acquired by the city with the objective of making it a local park. Stormwater management was initially planned through underground networks in the road network, before the construction of the water garden in the park was considered.
The private garden was fallow, with natural biodiversity and no direct pressure. The subsoil of the area consists of very low-permeability green clays, which leads to the presence of several springs on the site.
Île de France
RBD code
FRH-La Seine et les cours d'eau côtiers normands
NWRM(s) implemented in the case study
Climate zone
cool temperate moist
Light or indepth?
Monitoring requirements
No monitoring requirements.
Biophysical impact assessement method
No assessment methods or practices was used for assessing the biophysical impacts.
Project scale
Application scale
Installation date
Area (ha)
0.31 ha
Design capacity description
The park is able to manage 8 mm of rain
Factors constraints
8% slope
Favourable preconditions
To be consistent with the city's desire to share urban space with natural spaces, it was necessary to integrate a hydraulic and ecological dimension into the urban space, in particular by managing rainwater over an area of 3 ha. The choice of these types of developments was important so that the artificialization of the area by housing was not associated with soil sealing (and therefore runoff and stormwater management by the sewerage network).
Design contractual arrangement
Arrangement type Responsibility Role Comments Name
Design consultation activity
Activity stage Key issues Name Comments
Design land use change
Land use change type
Design authority
Authority type Role Responsibility Name Comments
Others (please specify in column H)
Initiation of the measure
Ville de Fourqueux
Agence Bertrand Paulet
Agence ATM
Success factor(s)
Success factor type Success factor role Comments
Attitude of decision makers
main factor

The city's strong commitment to an integrated stormwater management solution, and in line with the urban park objective, was a facilitating element during these discussions.

Financing type Comments
Barrier type Barrier role Comments
The prime contractor's proposal to consider stormwater management on site was a trigger for the project. However, the fact that work had already begun on the other areas of the site's requalification was a difficulty, given that the rainwater to be collected came from these areas. Many meetings were necessary to determine the possible interfaces in the water garden and other sites.
The slope of the site represented a technical difficulty because it was not suitable for rainwater infiltration. The solution proposed by the project manager was the use of a system of successive basins in "Asian terraces" format.
Driver type Driver role Comments
Financing share
Financing share type Share Comments
Policy description
The objectives of the project are:
Manage 1.7 hectares of rainwater in the open air;
Create a local square;
Improvement of the living environment (thermoregulation, cultural site);
Participation in integrated water resources management.
Policy target
Target purpose
Policy pressure
Pressure directive Relevant pressure
Policy area
Policy area type Policy area focus Name Comments
Policy impact
Impact directive Relevant impact
Policy wider plan
Wider plan type Wider plan focus Name Comments
Policy requirement directive
Requirement directive Specification
Information on retained water
The current rains are infiltrated, the heavier rains are partly infiltrated, the overflow joining the Seine.


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