Case study:Reconnection of a secondary arm of the Rhine: the Schafteu

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Location: 48° 19' 8", 7° 42' 16"
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Project overview

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Status Complete
Project web site
Themes Land use management - forestry, Hydromorphology, Flood risk management
Country France
Main contact forename Erwan
Main contact surname Hornier
Main contact user ID
Contact organisation Office national de l’eau et des milieux aquatiques
Contact organisation web site
Partner organisations
This is a parent project
encompassing the following
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Catchment and subcatchment

Catchment

River basin district Rhin-Meuse
River basin Alsace; Rhinau

Subcatchment

River name Schafteu
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m)
Dominant geology Siliceous
Ecoregion Western Plains
Dominant land cover Extensive agriculture, Grassland
Waterbody ID



Site

Name Schafteu
WFD water body codes FRCR2
WFD (national) typology
WFD water body name
Pre-project morphology Single channel, Straight, High width:depth
Reference morphology Single channel, Side Channels, Sinuous
Desired post project morphology
Heavily modified water body true
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology Quick run-off, Artificially regulated
Dominant substrate
River corridor land use Extensive agriculture, Grassland
Average bankfull channel width category 2 - 5 m
Average bankfull channel width (m) 3
3 m
0.003 km
300 cm
Average bankfull channel depth category 0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s) 2
2 m³/s
2,000 l/s
Average channel gradient category
Average channel gradient 0.1
Average unit stream power (W/m2) 653.8
653.8 W/m²


Project background

Reach length directly affected (m) 7500 m
7.5 km
750,000 cm
Project started 2004/02/01
Works started 2004/02/01
Works completed 2005/01/01
Project completed
Total cost category 500 - 1000 k€
Total cost (k€) 741 k€
741,000 €
Benefit to cost ratio
Funding sources European Union, Ministry for the Environment

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology Quantity & dynamics of flow, Flow velocities
Biology
Physico-chemical
Other reasons for the project Bank erosion, Potential recreation, Flood risk management


Measures

Structural measures
Bank/bed modifications Lowering of dike, Removal of obstructions to flow, Introducing large woody debris
Floodplain / River corridor
Planform / Channel pattern Flooding of small islands, Re-instatement of old course
Other
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 Yes Improvement
Flow velocities Yes Yes Yes Improvement

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


Monitoring documents



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Additional links and references

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Supplementary Information

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