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.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(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

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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

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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

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Mitigation of a pressure	canalization of the stream
Hydromorphology	Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project

Measures

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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)
Other	local students participated in works

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

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
Invertebrates	Yes	Yes	No	No	No
Phytoplankton	No	Yes	No	No	No

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
Public opinion	No	Yes	No	No	No

Monitoring documents

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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.

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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