Case study:Flood channel creation and reconnection between riverbed and its floodplain on Vezouze river

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Location: 48° 35' 39", 6° 29' 7"
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Project overview

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Status Complete
Project web site
Themes Flood risk management
Country France
Main contact forename Liliane
Main contact surname Biton
Main contact user ID
Contact organisation Communauté de communes du Lunévillois
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
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Project summary

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The Vezouze River has a pluvial regimen and its flow is rapidly affected by the rainfall. This cause a recurring flood, often violent on the urban area of Lunéville. Several factors upstream (natural flooding areas reduction) and downstream (bad drainage conditions) make the situation worse. Thus bank protection and riprap were put in place and the riverbed was regularly cleaned up. After the great flood in 2006, the Lunèville community undertook a global protection program in order to reduce flood risk, including expansion areas restoration. The restoration works include increase in riverbed width, removal of a protection bank on the left side, creation of two flood channels (one meter wide on average, on six hectares) with connected wetlands and revegetation of the riverbanks and the new channels. The results are really satisfactory, regarding both the ecological and hydraulic aspects; the water level and flooded areas were clearly reduced on Lunéville.

Monitoring surveys and results

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Lessons learnt

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Image gallery


The Vezouze at Luneville before the restoration. The protection bank on the left side prevents the flood expansion in the floodplain.
The Vezouze floodplain during the works in July 2007: creation of a flood channel on the left bank.
The Vezouze floodplain six months after works in December 2007; the flood channel on the left bank
The Vezouze floodplain two years after works in May 2009; the flood channel on the left bank
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Catchment and subcatchment

Catchment

River basin district Rhin-Meuse
River basin

Subcatchment

River name La Vezouze
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion Western Highlands
Dominant land cover Agriculture
Waterbody ID



Site

Name Lunéville
WFD water body codes FRCR286
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 1000
1,000 m
1 km
100,000 cm
Project started
Works started 2007/05/01
Works completed 2007/08/01
Project completed
Total cost category
Total cost (k€) 1930
1,930 k€
1,930,000 €
Benefit to cost ratio
Funding sources Direction régionale de l’environnement (DIREN) (20, 5 %), Agence de l’eau (34 %).

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design 50
50 k€
50,000 €
agence de l’eau, DIREN
Stakeholder engagement and communication
Works and works supervision 1700
1,700 k€
1,700,000 €
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Flood risk management
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Riverbank revegetation, Removal of bank reinforcements
Floodplain / River corridor Floodplain reconnection, Creation of a flood expansion area
Planform / Channel pattern Channel widening
Other Surface drainage systems improved
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Quantity & dynamics of flow Yes Yes No No No

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
hydrography, topography and geology of site Yes No No No No


Monitoring documents



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Additional links and references

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Supplementary Information

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