Bézannes Joint Development Zone (Reed Bed Park), Storm-water Management Solution

Entrance of the Reed bed Park (Parc de la Roselière)
Area characterisation: 

Implementation scale: Object (building, etc.)

Impact scale: Neighborhood, park, object (building, etc.)

Urban density: low (suburb at the limit with rural areas, etc.)


Overview of the Reed Bed park Flora of the Reed Bed Park (1) Flora of the Reed Bed Park (2)
  • Rainwater management of a 172ha area in response to a waterproofing construction

This NBS is a construction ex nihilo of a landscaped park as alternative stormwater management solution to a traditionnal civil engineering management (tubes). It takes place in a 172ha area in the city of Bézannes (Reims Métropole). This project has been implemented in response to the waterproofing of this area (strong urbanisation level).

The project is caracterized by an artificial river leading to a permanent lagoon and a reed bed. Then a wetland manage the water flow from the housing estate and finally a stream collects all of the water.

NBS benefits 
  • Developing climate change adaptation; improving risk management and resilience
  • Flood peak reduction
  • Increase infiltration / Water storage
  • Increasing infiltration
  • Reduce flood risk
  • Reduce load to sewer system
  • Reduce run-off
  • Developing climate change mitigation
  • Restoring ecosystems and their functions
  • Increase Biodiversity
  • Changing image of the urban environment
  • Improve water quality
  • Increase accessibility to green open spaces
  • Increase population & infrastructures protected by NBS
  • Increase well-being
Transferability of the result: 

Process enablers:
Knowledge drivers → Information accessibility → knowledge platforms

Process inhibitors:
... → ... → ...

Expected time for the NBS to become fully effective after its implementation: short (immediately to few months)

feedback: still well adapted

Expected life time: more than 30 years

Dates (for project delivered): 2012

Business cluster: Technological
Business model: Substitute with renewables and natural processes
The project has been implemented as a substitution of a civil engineering project. It leans on ecological engineering (infiltration areas, use of specific plants) to manage stormwater in a waterproof area therefore is based on a deep understanding of constructed wetlands for water management.


Global (estimated) cost of the project: 1M€- 5M€

Financing mechanism : cluster1 public financing

The project has received subsidies from the Champagne Ardenne region (25%) and from Reims Metropolis (75%).

NBS classification 
  • Objects Shapes
  • Water
  • Constructed wetlands and built structures for water management
  • Rain/infiltration gardens

Alice Duquesnoy (alice.duquesnoy-mitjavila@plante-et-cite.fr)
Olivier Damas
Plante & Cité, Maison du Végétal, 26 Rue Jean Dixmeras, 49000 Angers

Further information

Nature4Cities (https://www.nature4cities.eu/) aims to develop a knowledge diffusion around Nature-Based Solution (NBS) and a decision support platform through new collaborative models.

This project is part of the Nature4Cities's pioneer case studies database, it will feed the observatory, NBS pre-selection and replication tools, gathered into the Geocluster4NBS.

This project was chosen as a pioneer case study for the following reasons:

  1. The project has been implemented as a substitution of a civil engineering project
  2. Combination of ecological (rainwater management) and landscape functions (opento the public)

Nature4Cities project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 730468.

Urban challenges
Climate issues: 
Climate mitigation
Climate adaptation
Water management and quality: 
Urban water management and quality
Flood management
Biodiversity and urban space: 
Urban space development and regeneration
Soil management: 
Soil management and quality
Resource efficiency: 
Food, energy and water
Public health and well-being: 
Quality of life
Urban planning and governance: 
Urban planning and form
Green economy: 
Direct economic value of NBS
Key Performance Indicators: