Case study:Remeandering of the Mardereau stream at Sorigny

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Location: 47° 14' 28.04" N, 0° 41' 47.85" E

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Water quality
Country	France
Main contact forename	David
Main contact surname	Laurendeau
Main contact user ID
Contact organisation	Syndicat intercommunal d’aménagement de la vallée de l’Indre (SAVI)
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 Mardereau stream is a small tributary of the Indre river. The catchment is dominated by crops and the intensification of agricultural pressures since 1941 has resulted in the creation of an extensive drainage network of and the disappearance of wetland habitats. Soil sealing in the watershed is increasing due to the proximity of the town of Tours. As a result the flood risk management issue is very relevant. At Sorigny the Mardereau was straightened, dredged and, in the upstream part, cemented. Under the leadership of the Syndicat Intercommunal d’Aménagement de la Vallée de l’Indre (SAVI), a pilot restoration project has been realized. Works carried out included remeandering and plantation of riparian vegetation, together with some local biongeneering measures.

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Image gallery

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The Mardereau stream before restoration, in January 2009.

The Mardereau stream after restoration, in April 2009.

Students participating in plantation of ripisylve, in February 2009.

The Mardereau stream in August 2009, four months after restoration. Riparian vegetation has recolonized the riverbanks.

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Loire-Bretagne River basin Loire Subcatchment River name Mardereau Area category Area (km2) 8.58.5 km² <br />850 ha <br /> Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Western Plains Dominant land cover Intensive agriculture (arable) Waterbody ID Site Edit site Name Sorigny WFD water body codes FRGR2158 WFD (national) typology WFD water body name Pre-project morphology Single channel Reference morphology Actively meandering Desired post project morphology Heavily modified water body Yes 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 Intensive agriculture (arable) 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 Edit project background Reach length directly affected (m) 230230 m <br />0.23 km <br />23,000 cm <br /> Project started Works started 2009/03/01 Works completed 2009/03/31 Project completed Total cost category Total cost (k€) 1919 k€ <br />19,000 € <br /> Benefit to cost ratio Funding sources 100 % Syndicat intercommunal d’aménagement de la vallée de l’Indre 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 1919 k€ <br />19,000 € <br /> 100 % Syndicat intercommunal d’aménagement de la vallée de l’Indre Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure canalization of the stream Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Riverbank revegetation, Introducing stones Floodplain / River corridor Planform / Channel pattern Re-meandering Other Non-structural measures Management interventions Social measures (incl. engagement) Engagement with schools, Student Education Other Local support 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 Invertebrates Yes Yes No No No Phytoplankton No Yes No No No 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 Public opinion No Yes No No No 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