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

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Location: 48° 35' 39.25" N, 6° 29' 6.50" E

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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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Catchment and subcatchment

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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

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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

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Reach length directly affected (m)	10001,000 m <br />1 km <br />100,000 cm <br />
Project started
Works started	2007/05/01
Works completed	2007/08/01
Project completed
Total cost category
Total cost (k€)	19301,930 k€ <br />1,930,000 € <br />
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		5050 k€ <br />50,000 € <br />	agence de l’eau, DIREN
Stakeholder engagement and communication
Works and works supervision		17001,700 k€ <br />1,700,000 € <br />
Post-project management and maintenance
Monitoring

Reasons for river restoration

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

Measures

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

Monitoring

Hydromorphological quality elements

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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

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quality elements

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

Physico-chemical quality elements

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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

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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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Image gallery

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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

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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