Case study:Restoration of the original riverbed of the Steinbaechlein

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Location: 47° 44' 27.33" N, 7° 17' 1.77" E

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Water quality, Urban
Country	France
Main contact forename	Onema
Main contact surname	(Office national de l’eau et des milieux aquatiques)
Main contact user ID
Contact organisation	Onema
Contact organisation web site	http://www.onema.fr/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Project picture

Project summary

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The Steinbaechlein is a 14.5 kilometers long secondary arm of the Doller, the latter having a mainly agricultural 215 km2 wide watershed. In the XIX century, a 400 long meander of the Steinbaechlein was cut in order to provide water to a chemical factory. Following the dismantling of the factory and in the framework of a new business and residential development, the river was returned to its old bed. The work was motivated by the need to increase the available surface for a commercial building and the will to get the river away from polluted soil. The new bed was excavated in the wasteland that had developed in place of the former course of the river. Diversified cross sections and widths were established and the profile was fixed by two sills; helophytes were planted in the banks and in the riverbed along almost all the restored stretch. On the left side of the river a wetland was created, to be used as flood retention area.

Monitoring surveys and results

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No pre-project assessment was carried out. In 2007, electrofishing was conducted by the National Office for Water and Aquatic Environments (ONEMA), showing a good recolonization of the restored stretch by fish; juveniles of trout, target species in the river, were also found. Since then no other monitoring has been done or is foreseen.

Lessons learnt

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Image gallery

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The Steinbaechlein in October 2007, two years after restoration.

The Steinbaechlein in summer 2007, three years after restoration.

Development of willows along the Steinbaechlein in summer 2008 upstream of the restored area.

A recreated wetland (summer 2008).

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Rhin-Meuse River basin Rhine Subcatchment River name Doller Area category Area (km2) 215215 km² <br />21,500 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Western Highlands Dominant land cover Intensive agriculture (arable) Waterbody ID Site Edit site Name Steinbaechlein WFD water body codes FRCR62 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 Urban Average bankfull channel width category Average bankfull channel width (m) 44 m <br />0.004 km <br />400 cm <br /> Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 0.40.4 m³/s <br />400 l/s <br /> Average channel gradient category Average channel gradient 0.7 Average unit stream power (W/m2) 686.49686.49 W/m² <br /> Project background Edit project background Reach length directly affected (m) 400400 m <br />0.4 km <br />40,000 cm <br /> Project started Works started 2005/01/01 Works completed 2005/10/31 Project completed Total cost category Total cost (k€) 301.86301.86 k€ <br />301,860 € <br /> Benefit to cost ratio Funding sources Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 1.861.86 k€ <br />1,860 € <br /> Office national de l’eau et des milieux aquatiques – service départemental Stakeholder engagement and communication Works and works supervision 300300 k€ <br />300,000 € <br /> Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project increase the available surface for a residencial developpement Measures Edit Measures Structural measures Bank/bed modifications Restoring riparian vegetation Floodplain / River corridor Creation of wetland Planform / Channel pattern Re-instatement of old course Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish No Yes No Yes No Improvement Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Case study description by ONEMA (French National Agency for Water and Aquatic Environments) (in French). Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information