Case study:Adaptive management of hydraulic structures in the Sèvre nantaise and Thouet basins

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Location: 47° 35' 17", -2° 39' 47"
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Project overview

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Status In progress
Project web site
Themes
Country France
Main contact forename Antoine
Main contact surname Charrier
Main contact user ID
Contact organisation Institution Interdepartmentale du bassin de la Sèvre Nantaise
Contact organisation web site
Partner organisations
This is a parent project
encompassing the following
projects
Partial removal of weir on the Sanguèze at Mouzillon, Partial removal of weir on the Thouet at Le Tallud
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Project summary

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More than 300 sites in the Sèvre Nantaise and Thouet basins with hydraulic structures underwent participative multicriteria analysis in order to develop programmes to help meet targets defined in the French SAGE process as well as delivering improvements to meet Water Framework Directive objectives.

Monitoring surveys and results

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Lessons learnt

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Image gallery


The La Motte reservoir, on the Sanguèze river, in 2003, before works.
The La Motte reservoir, in 2004, after works. The original sinous water body was partially restored.
The La Motte reservoir in 2006, two years after works: the river banks were revegeteted.
A pool on the Thouet River in 2004, before the lowering of the water level.
A pool on the Thouet River in 2006, after works: the lowering of the water level allows the diversification of flow rates (restoration of a riffle).
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Catchment and subcatchment



Site

Name
WFD water body codes
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

Reach length directly affected (m)
Project started 2004/01/01
Works started
Works completed
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources Water Agency, Regional Council of the Pays de la Loire, Départment-level Councils of the Vendée, Loire Atlantique, Deux-Sèvres and Maine-et-Loire, Leader+ European Structural Fund

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design 50
50 k€
50,000 €
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Impoundments (not hydropower)
Hydromorphology Quantity & dynamics of flow, Continuity for organisms, Width & depth variation
Biology Fish: Species composition, Fish: Abundance, Invertebrates: Taxonomic composition
Physico-chemical
Other reasons for the project Community demand, Recreation


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern Weir partial removal or permanent opening of gates allowing self restoration of previously impunded stretches
Other
Non-structural measures
Management interventions More natural reservoir releases
Social measures (incl. engagement)
Other Information provision, Consultation, Participation in works, River contract


Monitoring

Hydromorphological quality elements

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

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
[[]] No No No No No

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
Social representation of the river


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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